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why jeremy corbyn is being described as a 'threat to national security' | If you say something is a threat to nation security or something similar you will automatically mobilize a huge segment of conservative votership against someone. It's nothing more than a cheap political move, but it will probably work. | [
"He also claims that insecure messaging puts national security at risk. He claims that since the White House staffers must bypass government servers, their email is traveling across the Internet without necessary security. He cites numerous national security risk scenarios that could occur due to possible interception of White House email messages.\n",
"BULLET::::- Reject Secrecy: she believes that those \"on the left and right who believe that the American people have no greater enemy than their own government\", whom she implies believe in full transparency and no secrecy, are not able to answer how this protects the United States against terrorist attack and that \"opponents of the Patriot Act have never explained how they think the government can track down the web of Islamist activity in public\".\n",
"He is an advocate of enhancing intelligence capabilities, modernizing military equipment and spending more money on preparing first-responders like firemen and emergency medical technicians for crises. He worries that future presidential administrations will spend less than they should on homeland security because to do so will require raising taxes or cutting non-defense programs. He also worries that the unpopularity of the Iraq war will cause the country to reduce its military presence overseas.\n",
"On May 25, 2006, Boehner issued a statement defending his agenda and attacking his \"Democrat friends\" such as Minority Leader Nancy Pelosi. Boehner said regarding national security that voters \"have a choice between a Republican Party that understands the stakes and is dedicated to victory, and a Democrat Party with a non-existent national security policy that sheepishly dismisses the challenges of a post-9/11 world and is all too willing to concede defeat on the battlefield in Iraq.\"\n",
"He forcefully defended his actions as \"crucial to our national security\" and claimed that the American people expected him to \"do everything in my power, under our laws and Constitution, to protect them and their civil liberties\" as long as there was a \"continuing threat\" from al Qaeda. The president also had harsh words for those who broke the story, saying that they acted illegally. \"The unauthorized disclosure of this effort damages our national security and puts our citizens at risk\", he said.\n",
"Corbyn has said he would want with the US a \"strong and friendly relationship\", while \"not be[ing] afraid to speak our mind\". He has also said the country \"is the strongest military power on the planet by a very long way. It has a special responsibility to use its power with care and to support international efforts to resolve conflicts collectively and peacefully\". He has also said that US President, Donald Trump, \"seems determined to add to the dangers [in the global situation] by recklessly escalating the confrontation with North Korea, unilaterally launching missile strikes on Syria, opposing President Obama’s nuclear arms deal with Iran and backing a new nuclear arms race\". Following Trump's withdrawal of the US from the Paris Agreement, he said it was a \"very big shame\", further saying that \"Donald Trump's decision to pull the United States out of the Paris climate change deal is reckless and dangerous\".\n",
"However, current Labour leader Jeremy Corbyn has been vocal on Middle East foreign policy. He is a member of the Palestine Solidarity Campaign, regularly campaigning against conflict in Gaza and what the organisation considers to be apartheid in Israel. Corbyn has also supported boycotting and sanctioning arms dealings in Israel, saying on the \"Electronic Intifada\": \"I think we have to push robustly for the limitation of arms supplies ... Israel is after all facing an investigation ... for war crimes, [at the International Criminal Court] as indeed are the Hamas forces on a much different or lesser scale.\"\n"
] |
Do "non-water rainbows" exist and (if yes) what do they look like? | The main difference between different liquids boils down to their indices of refraction and their dispersion. Changes in the index of refraction would alter the size of the rainbow arc, while changes in their dispersion would change how wide the actual rainbow band is. If the dispersion is negative, it would also flip the order of the rainbow (Red would be on the inside, and violet would be on the outside). | [
"The rainbow, a natural phenomenon noted for its beauty and mystical appearance, has been a favorite component of mythology throughout history. Rainbows are part of the myths of many cultures around the world. The Norse saw it as Bifrost; Abrahamic traditions see it as a covenant with God not to destroy the world by means of floodwater. Whether as a bridge to the heavens, messenger, archer's bow, or serpent, the rainbow has been pressed into symbolic service for millennia. There is a myriad of beliefs concerning the rainbow. The complex diversity of rainbow myths are far-reaching, as are their inherent similarities.\n",
"A rainbow is not located at a specific distance from the observer, but comes from an optical illusion caused by any water droplets viewed from a certain angle relative to a light source. Thus, a rainbow is not an object and cannot be physically approached. Indeed, it is impossible for an observer to see a rainbow from water droplets at any angle other than the customary one of 42 degrees from the direction opposite the light source. Even if an observer sees another observer who seems \"under\" or \"at the end of\" a rainbow, the second observer will see a different rainbow—farther off—at the same angle as seen by the first observer.\n",
"A circular rainbow should not be confused with the glory, which is much smaller in diameter and is created by different optical processes. In the right circumstances, a glory and a (circular) rainbow or fog bow can occur together. Another atmospheric phenomenon that may be mistaken for a \"circular rainbow\" is the 22° halo, which is caused by ice crystals rather than liquid water droplets, and is located around the sun (or moon), not opposite it.\n",
"A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.\n",
"Rainbows occur frequently in mythology, and have been used in the arts. One of the earliest literary occurrences of a rainbow is in the Book of Genesis chapter 9, as part of the flood story of Noah, where it is a sign of God's covenant to never destroy all life on earth with a global flood again. In Norse mythology, the rainbow bridge Bifröst connects the world of men (Midgard) and the realm of the gods (Asgard). Cuchavira was the god of the rainbow for the Muisca in present-day Colombia and when the regular rains on the Bogotá savanna were over, the people thanked him offering gold, snails and small emeralds. The Irish leprechaun's secret hiding place for his pot of gold is usually said to be at the end of the rainbow. This place is appropriately impossible to reach, because the rainbow is an optical effect which cannot be approached.\n",
"A rainbow does not exist at one particular location. Many rainbows exist; however, only one can be seen depending on the particular observer's viewpoint as droplets of light illuminated by the sun. All raindrops refract and reflect the sunlight in the same way, but only the light from some raindrops reaches the observer's eye. This light is what constitutes the rainbow for that observer. The whole system composed by the sun's rays, the observer's head, and the (spherical) water drops has an axial symmetry around the axis through the observer's head and parallel to the sun's rays. The rainbow is curved because the set of all the raindrops that have the right angle between the observer, the drop, and the sun, lie on a cone pointing at the sun with the observer at the tip. The base of the cone forms a circle at an angle of 40–42° to the line between the observer's head and their shadow but 50% or more of the circle is below the horizon, unless the observer is sufficiently far above the earth's surface to see it all, for example in an aeroplane (see above). Alternatively, an observer with the right vantage point may see the full circle in a fountain or waterfall spray.\n",
"Supernumerary rainbows cannot be explained using classical geometric optics. The alternating faint bands are caused by interference between rays of light following slightly different paths with slightly varying lengths within the raindrops. Some rays are in phase, reinforcing each other through constructive interference, creating a bright band; others are out of phase by up to half a wavelength, cancelling each other out through destructive interference, and creating a gap. Given the different angles of refraction for rays of different colours, the patterns of interference are slightly different for rays of different colours, so each bright band is differentiated in colour, creating a miniature rainbow. Supernumerary rainbows are clearest when raindrops are small and of uniform size. The very existence of supernumerary rainbows was historically a first indication of the wave nature of light, and the first explanation was provided by Thomas Young in 1804.\n"
] |
Would it be possible to use MagLev technology for faster/ cheaper Space Shuttle launches? | This is definitely possible; a more practical arrangement would be a straight track running through a tunnel angled through a mountain range pointed along your desired orbit. You probably wouldn't want to use magnetic levitation exactly either, rather a sled propelled through electromagnetic propulsion.
There are a variety of interesting hurdles to overcome with such an arrangement. For example firing a projectile down the tunnel leaves a lot of air to move out of the way to allow passage. What do you do with it? It can't escape out the end fast enough so it would compress at the front of the projectile, stealing energy from the launch and perhaps damaging the payload. Engineering vents in miles of launch tunnel increases costs, and due to being underground probably won't exhaust to the surface.
The benefits to such a launch system are interesting. While it would require similar energy as a rocket launch the energy can be obtained and spent in a different way. You could for example use electrical energy from hydroelectric generators rather than chemical rockets. You don't have to carry as much fuel along with the payload thus increasing the load or decreasing the vehicle size.
Drawbacks might include throwing launch sleds into the plains beyond the mountain range, and your launch tunnel melting and requiring regular maintenance. | [
"NASA has been developing a launch aid using a magnetic levitation system to propel a spaceship. Proponents of maglev launch aid posit that it saves on design and launching costs, while providing a safer launching method.\n",
"James R. Powell, former co-inventor of superconducting maglev in the 1960s, has since 2001 led investigation of a concept for using a maglev vactrain for space launch (theoretically two orders of magnitude less marginal cost than present rockets), where the StarTram proposal would have vehicles reach up to within an acceleration tunnel (lengthy to limit g-forces), considering boring through the ice sheet in Antarctica for lower anticipated expense than in rock.\n",
"Several new technologies needed to be developed and tested to facilitate successful launch and recovery of both stages of the SpaceX reusable rocket launching system. Following the completion of the third high-altitude controlled-descent test, and the completion of the third low-altitude flight of the second-generation prototype test vehicle (plus eight flights of the first-generation Grasshopper prototype flight test vehicle), SpaceX indicated that they are now able to consistently \"reenter from space at hypersonic velocity, restart main engines twice, deploy landing legs and touch down at near zero velocity.\"\n",
"StarTram is a proposal for a maglev space launch system. The initial Generation 1 facility would be cargo only, launching from a mountain peak at an altitude of with an evacuated tube staying at local surface level; it has been claimed that about 150,000 tons could be lifted to orbit annually. More advanced technology would be required for the Generation 2 system for passengers, with a longer track instead gradually curving up at its end to the thinner air at altitude, supported by magnetic levitation, reducing g-forces when each capsule transitions from the vacuum tube to the atmosphere. A SPESIF 2010 presentation stated that Gen-1 could be completed by the year 2020+ if funding began in 2010, Gen-2 by 2030+.\n",
"Elon Musk said at the beginning of the program that he believed the return, vertical landing and recovery was possible because the SpaceX manufacturing methodologies result in a rocket efficiency exceeding the typical 3% margin. A SpaceX rocket operating in the reusable configuration has approximately 30% less payload lift capacity than the same rocket in an expendable configuration.\n",
"The NASA Solar Technology Application Readiness (NSTAR) electrostatic ion thruster, developed at NASA Glenn, achieves a specific impulse of 1000–3000 seconds. This is an order of magnitude higher than traditional space propulsion methods, resulting in a mass savings of approximately half. This leads to much cheaper launch vehicles. Although the engine produces just thrust at maximal power (2,100 W on DS1), the craft achieved high speeds because ion engines thrust continuously for long periods.\n",
"Separate technologies may be combined. In 2010, NASA suggested that a future scramjet aircraft might be accelerated to 300 m/s (a solution to the problem of ramjet engines not being startable at zero airflow velocity) by electromagnetic or other sled launch assist, in turn air-launching a second-stage rocket delivering a satellite to orbit.\n"
] |
- how do we perceive color? | if you are british you can watch this _URL_0_
its an episode of horizon that explores how people see colour. in recent research there's evidence that not everybody sees it the same way. for example in modern society we see primary and secondary colours as being very distinct. but a certain african tribe find it difficult to distinguish between certain colours. but that tribe sees the difference between certain shades of green more greatly than we do. because maybe it helps them distinguish ripe vegetables when gathering food.
it's a good watch. | [
"Color vision is how we perceive the objective color, which people, animals and machines are able to distinguish objects based on the different wavelengths of light reflected, transmitted, or emitted by the object. In humans, light is detected by the eye using two types of photoreceptors, cones and rods, which send signals to the visual cortex, which in turn processes those colors into a subjective perception. Color constancy is a process that allows the brain to recognize a familiar object as being a consistent color regardless of the amount or wavelengths of light reflecting from it at a given moment.\n",
"The question hinges on whether color is a product of the mind or an inherent property of objects. While most philosophers will agree that color assignment corresponds to spectra of light frequencies, it is not at all clear whether the particular psychological phenomena of color are imposed on these visual signals by the mind, or whether such qualia are somehow naturally associated with their noumena. Another way to look at this question is to assume two people (\"Fred\" and \"George\" for the sake of convenience) see colors differently. That is, when Fred sees the sky, his mind interprets this light signal as blue. He calls the sky \"blue.\" However, when George sees the sky, his mind assigns green to that light frequency. If Fred were able to step into George's mind, he would be amazed that George saw green skies. However, George has learned to associate the word \"blue\" with what his mind sees as green, and so he calls the sky \"blue\", because for him the color green has the name \"blue.\" The question is whether blue must be blue for all people, or whether the perception of that particular color is assigned by the mind.\n",
"Color is the result of light reflecting back from an object to our eyes. The color that our eyes perceive is determined by the pigment of the object itself. Color theory and the color wheel are often referred to when studying colour combinations in visual design. Color is often deemed to be an important element of design as it is a universal language which presents the countless possibilities of visual communication.\n",
"In fine art realism and scientific descriptions of color perception, local color is the color the brain perceives an object to be. This may be radically different from the actual wavelength of light received by the pupil. For example, an apple is painted to appear red in comparison to the colors around it, but the actual pigment mixture used may be a pale green. This effect, known as color constancy, can also be observed under colored lighting in reality, and in photographs with strong color tints such as The Dress.\n",
"Perception of color depends heavily on the context in which the perceived object is presented. For example, a white page under blue, pink, or purple light will reflect mostly blue, pink, or purple light to the eye, respectively; the brain, however, compensates for the effect of lighting (based on the color shift of surrounding objects) and is more likely to interpret the page as white under all three conditions, a phenomenon known as color constancy.\n",
"Color is usually attributed to external bodies. However, color is actually the activity of the eye's retina. It is a sensation. The external body is perceived as the cause of the sensation of color. We say, \"The body is red.\" In reality, though, color exists only in the retina of the eye. It is separate from the external object. Color is a mere sensation in the sense organ. The external object is perceived by the intellect's understanding as being the cause of sensations.\n",
"As an analogy, consider the experience of color. People experience colors as discrete categories: blue, red, yellow, and so on, and these categories vary in different cultures. The physics of color, however, is actually continuous, with wavelengths measured in nanometers along a scale from ultraviolet to infrared. When a person experiences an object as \"blue\", she is (unconsciously) using her color concepts to categorize this wavelength. And in fact, people experience a whole range of wavelengths as \"blue.\"\n"
] |
Is there a trade off that makes it hard for a virus to be both very contagious and very deadly? | Yeah, viruses that are overly virulent kill their hosts before they are able to transmit the virus to new hosts, so more deadly viral lineages tend to burn out before being widely transmitted. So there's an evolutionary trade off between high virulence and a strain's ability to maintain itself in a population. | [
"Dr. Anthony S. Fauci of the National Institutes of Health in Bethesda, Maryland, stated that as of now MERS-CoV \"does not spread in a sustained person to person way at all.\" Dr. Fauci stated that there is potential danger in that it is possible for the virus to mutate into a strain that does transmit from person to person.\n",
"Generally, if a virus kills its host too quickly, the host will not have a chance to come in contact with other hosts and transmit the virus before dying. However, in serial passage, when a virus was being transmitted from host to host regardless of its virulence, such as Subbaro’s experiment, the viruses that grow the fastest (and are therefore the most virulent) are selected for.\n",
"This strain of virus is less virulent than its counterpart, needing blood contact to transmit, and usually taking a longer time to infect a person, although it can have sudden short bursts of activity, during which spikes of techno-organic matter form from the diseased body and the body's parts change their forms. Another difference with the Transmode Virus is that infection is very painful and can incapacitate a person.\n",
"Because viruses use vital metabolic pathways within host cells to replicate, they are difficult to eliminate without using drugs that cause toxic effects to host cells in general. The most effective medical approaches to viral diseases are vaccinations to provide immunity to infection, and antiviral drugs that selectively interfere with viral replication.\n",
"Viral vectors proved to be more successful in transfecting cells as their life cycles require them to transfer their own genes to the host cells with high efficiency. A virus infects the human by inserting its gene directly into his cells. This can be deadly, but the brilliant idea is to take advantage of this natural ability. The idea is to remove all the dangerous genes in the virus and inject the healthy human genes. So, viruses are inserting positive elements to the host cells while attacking them and they will be helpful rather than harmful.\n",
"These viruses are not currently believed to cause disease in humans. Infection with these viruses tends to lead to lifelong viraemia and their possible association with disease remains under investigation. Higher than usual viral loads have been associated with severe idiopathic inflammatory myopathies, cancer and lupus.\n",
"The use of agents that do not cause harm to humans but disrupt the economy have been discussed. A highly relevant pathogen in this context is the foot-and-mouth disease (FMD) virus, which is capable of causing widespread economic damage and public concern (as witnessed in the 2001 and 2007 FMD outbreaks in the UK), whilst having almost no capacity to infect humans.\n"
] |
(tennis elbow) why does applying pressure to the mid-arm, such as using a compression sleeve, greatly reduce or eliminate pain from tennis elbow? | The compression bands are meant to be worn about an inch or two down from where the tendon attaches to the bone. This helps to take the pressure off the tendon and allow it to heal. Basically the bands make our body think that the tendon actually attaches at the band, rather than at the bone. This allows the tendon to heal because when you use the muscle, the inflamed area isn't being used.
In response to the person talking about shin splints, the bands for shin splints don't work because a lot of times there is too much compression in the shin and that's what causes the shin splints. Also, shin splints are not usually located in the tendon, as much as the entire muscle. So there's really not a specific area to take the pressure off. | [
"Tennis elbow, also known as lateral epicondylitis, is a condition in which the outer part of the elbow becomes painful and tender. The pain may also extend into the back of the forearm and grip strength may be weak. Onset of symptoms is generally gradual. Golfer's elbow is a similar condition that affects the inside of the elbow.\n",
"One way to help treat minor cases of tennis elbow is to simply relax the affected arm. The rest lets stress and tightness within the forearm slowly relax and eventually have the arm in working condition—in a day or two, depending on the case.\n",
"Symptoms associated with tennis elbow include, but are not limited to, radiating pain from the outside of the elbow to the forearm and wrist, pain during extension of wrist, weakness of the forearm, a painful grip while shaking hands or torquing a doorknob, and not being able to hold relatively heavy items in the hand. The pain is similar to the condition known as \"golfer's elbow\", but the latter occurs at the medial side of the elbow.\n",
"Tennis elbow is a very common type of overuse injury. It can occur both from chronic repetitive motions of the hand and forearm, and from trauma to the same areas. These repetitions can injure the tendons that connect the extensor supinator muscles (which rotate and extend the forearm) to the olecranon process (also known as “the elbow”). Pain occurs, often radiating from the lateral forearm. Weakness, numbness, and stiffness are also very common, along with tenderness upon touch.\n",
"Tennis elbow or lateral epicondylitis is a chronic or an acute inflammation of the tendons that arise from the outer part of the elbow. The affected tendons are the tendons of extensor muscles which originate from the lateral epicondyle of humerus. It is caused by the repetitive movements and overuse. It damages the tendons which results in pain and tenderness on the outer part of the elbow.\n",
"Injuries to the Elbow are predominantly a result of poor techniques when both batting and bowling. Having a poor technique causes excess strain on the joint resulting in inflammation of the tendons surrounding the elbow. The inflammation can be treated through physiotherapy and rehabilitation to reduce the inflammation and strengthen the imbalance in the forearm.\n",
"Early experiments suggested that tennis elbow was primarily caused by overexertion. However, studies show that trauma such as direct blows to the epicondyle, a sudden forceful pull, or forceful extension cause more than half of these injuries. Repeatedly mis-hitting a tennis ball in the early stages of learning the sport causes shock to the elbow joint and may contribute to contracting the condition.\n"
] |
how is amd still in business? | > they seem to consistently post losses, in both revenue and market share.
That's not enough information. Is that in only one market sector? AMD gave up on the PC market years ago, and that only makes up a small percent of their entire revenue stream. They make semi-conductors, and that's more than just processors, but also things like photo sensors, power converters, amplifiers, different types of diodes... | [
"By February 2015, roughly 40 percent of AMD's sales came from non-PC markets, such as video game consoles and embedded devices. When Su joined AMD in 2012, about 10 percent of sales came from non-PC products. In May 2015, Su and other AMD executives presented a long-term strategy for the company to focus on developing high-performance computing and graphics technologies for three growth areas: gaming, datacenter, and \"immersive platforms\" markets.\n",
"AMD developed its first generation virtualization extensions under the code name \"Pacifica\", and initially published them as AMD Secure Virtual Machine (SVM), but later marketed them under the trademark \"AMD Virtualization\", abbreviated \"AMD-V\".\n",
"In September 1969, AMD moved from its temporary location in Santa Clara to Sunnyvale, California. To immediately secure a customer base, AMD initially became a second source supplier of microchips designed by Fairchild and National Semiconductor. AMD first focused on producing logic chips. The company guaranteed quality control to United States Military Standard, an advantage in the early computer industry since unreliability in microchips was a distinct problem that customers – including computer manufacturers, the telecommunications industry, and instrument manufacturers – wanted to avoid.\n",
"On October 16, 2014, AMD announced a new restructuring plan along with its Q3 results. Effective July 1, 2014, AMD reorganized into two business groups: Computing and Graphics, which primarily includes desktop and notebook processors and chipsets, discrete GPUs, and professional graphics; and Enterprise, Embedded and Semi-Custom, which primarily includes server and embedded processors, dense servers, semi-custom SoC products (including solutions for gaming consoles), engineering services, and royalties. As part of this restructuring, AMD announced that 7% of its global workforce would be laid off by the end of 2014.\n",
"AMS is a field marketing organization offering sales and marketing support to insurance marketing entities. From May 1999 to September 2003, AMS hired Gagnon, an at-will, independent contractor, to develop custom software to assist with its information technology needs. AMS was Gagnon’s largest client, accounting for $2 million of revenue and 98 percent of his business. From May 2000 through April 2001, AMS and Gagnon entered a Technical Services Agreement, but nothing about a license was mentioned.\n",
"AMD Piledriver Family 15h is a microarchitecture developed by AMD as the second-generation successor to Bulldozer. It targets desktop, mobile and server markets. It is used for the AMD Accelerated Processing Unit (formerly Fusion), AMD FX, and the Opteron line of processors.\n",
"The AMT has undergone several changes since 1969. The most significant of those, according to the Joint Committee on Taxation, occurred under the Reagan era Tax Equity and Fiscal Responsibility Act of 1982. The law changed the AMT from an add-on tax to its current form: a parallel tax system. The current structure of the AMT reflects changes that were made by the 1982 law. However, participation and revenues from the AMT temporarily plummeted after the 1986 changes. Congress made other notable, but less significant, changes to the law in 1978, 1982, and 1986.\n"
] |
Can a planet have a core made of diamond? | Not a core, but a planet with a higher carbon/oxygen ratio than Earth might end up with a mantle composed of diamond and silica carbide. However, these materials are poorer insulators than the silicate-dominated mantle we have, so such a planet would cool fairly rapidly in its interior and lack surface tectonics and volcanic outgassing, which are vital to the stability of Earth's habitable climate. | [
"Such a planet would probably have an iron- or steel-rich core like the known terrestrial planets. Surrounding that would be molten silicon carbide and titanium carbide. Above that, a layer of carbon in the form of graphite, possibly with a kilometers-thick substratum of diamond if there is sufficient pressure. During volcanic eruptions, it is possible that diamonds from the interior could come up to the surface, resulting in mountains of diamonds and silicon carbides. The surface would contain frozen or liquid hydrocarbons (e.g. tar and methane) and carbon monoxide. A weather cycle is theoretically possible on carbon planets with an atmosphere, provided that the average surface temperature is below 77 °C.\n",
"Although diamonds on Earth are rare, extraterrestrial diamonds (diamonds formed outside of Earth) are very common. Diamonds not much larger than molecules are abundant in meteorites and some of them formed in stars before the Solar System existed. High pressure experiments suggest large amounts of diamonds are formed from methane on the ice giant planets Uranus and Neptune, while some planets in other solar systems may be almost pure diamond. Diamonds are also found in stars and may have been the first mineral ever to have formed.\n",
"All of the rocky inner planets, as well as the moon, have an iron-dominant core. Venus and Mars have an additional major element in the core. Venus’ core is believed to be iron-nickel, similarly to Earth. Mars, on the other hand, is believed to have an iron-sulfur core and is separated into an outer liquid layer around an inner solid core. As the orbital radius of a rocky planet increases, the size of the core relative to the total radius of the planet decreases. This is believed to be because differentiation of the core is directly related to a body's initial heat, so Mercury's core is relatively large and active. Venus and Mars, as well as the moon, do not have magnetic fields. This could be due to a lack of a convecting liquid layer interacting with a solid inner core, as Venus’ core is not layered. Although Mars does have a liquid and solid layer, they do not appear to be interacting in the same way that Earth's liquid and solid components interact to produce a dynamo.\n",
"Because the companion to PSR J1719-1438 is planet-sized, made primarily of carbon (with an unknown amount of oxygen), and very dense, it may be similar to a large diamond. In the science press, the object has been called the \"Diamond Planet\".\n",
"In 1981, Marvin Ross wrote a paper titled \"The ice layer in Uranus and Neptune—diamonds in the sky?\" in which he proposed that huge quantities of diamonds might be found in the interior of these planets. At Lawrence Livermore, he had analyzed data from shock-wave compression of methane (CH) and found that the extreme pressure separated the carbon atom from the hydrogen, freeing it to form diamond.\n",
"Earth's core is believed to be mostly an alloy of iron and nickel. The density indicates that it also contains a significant amount of lighter elements. Elements such as hydrogen would be stable in the Earth's core, however the conditions at the formation of the core would not be suitable for its inclusion. Carbon is a very likely constituent of the core. Preferential partitioning of the carbon isotopeC into the metallic core, during its formation, may explain why there seems to be more C on the surface and mantle of the Earth compared to other solar system bodies (−5‰ compared to -20‰). The difference can also help to predict the value of the carbon proportion of the core.\n",
"BULLET::::- Most diamonds are not formed from highly compressed coal. More than 99 percent of diamonds ever mined have formed in the conditions of extreme heat and pressure about below the earth's surface. Coal is formed from prehistoric plants buried much closer to the surface, and is unlikely to migrate below through common geological processes. Most diamonds that have been dated are older than the first land plants, and are therefore older than coal. It is possible that diamonds can form from coal in subduction zones and in meteoroid impacts, but diamonds formed in this way are rare and the carbon source is more likely carbonate rocks and organic carbon in sediments, rather than coal.\n"
] |
Is it possible for a conductive room temperature gas to exist? | Generally no, gases don't have free electrons. If you ionized it, it would be a plasma (which does conduct), and if you're asking if there is cold plasma, [there is](_URL_0_) (they're in fluorescent lights). | [
"Below the operating temperature, the liquid is too cold and cannot vaporize into a gas. Above the operating temperature, all the liquid has turned to gas, and the environmental temperature is too high for any of the gas to condense. In other words, whether too high or too low, thermal conduction is still possible through the walls of the heat pipe, but at a greatly reduced rate of thermal transfer.\n",
"In monatomic gases (like argon) at room temperature and constant volume, volumetric heat capacities are all very close to 0.5 kJ/K/m, which is the same as the theoretical value of 3/2 RT per kelvin per mole of gas molecules (where R is the gas constant and T is temperature). As noted, the much lower values for gas heat capacity in terms of volume as compared with solids (although more comparable per mole, see below) results mostly from the fact that gases under standard conditions consist of mostly empty space (about 99.9% of volume), which is not filled by the atomic volumes of the atoms in the gas. Since the molar volume of gases is very roughly 1000 times that of solids and liquids, this results in a factor of about 1000 loss in volumetric heat capacity for gases, as compared with liquids and solids. Monatomic gas heat capacities per atom (not per molecule) are decreased by a factor of 2 with regard to solids, due to loss of half of the potential degrees of freedom per atom for storing energy in a monatomic gas, as compared with regard to an ideal solid. There is some difference in the heat capacity of monatomic vs. polyatomic gasses, and also gas heat capacity is temperature-dependent in many ranges for polyatomic gases; these factors act to modestly (up to the discussed factor of 2) increase heat capacity per atom in polyatomic gases, as compared with monatomic gases. Volumetric heat capacities in polyatomic gases vary widely, however, since they are dependent largely on the number of atoms per molecule in the gas, which in turn determines the total number of atoms per volume in the gas.\n",
"This definition proves useful in vacuum systems because under conditions of rarefied gas flow, the conductance of various structures is usually constant, and the overall conductance of a complex network of pipes, orifices and other conveyances can be found in direct analogy to a resistive electrical circuit.\n",
"Most are gases at room temperature; have relatively low densities; are poor electrical and thermal conductors; have relatively high ionisation energies and electronegativities; form acidic oxides; and are found naturally in uncombined states in large amounts.\n",
"In vacuum technology, the residence time of gases on the surfaces of a vacuum chamber can determine the pressure due to outgassing. If the chamber can be heated, the above equation shows that the gases can be \"baked out\"; but if not, then surfaces with a low residence time are needed to achieve ultra-high vacuums.\n",
"Although it is not a particularly convenient device, the gas thermometer provides an essential theoretical basis by which all thermometers can be calibrated. As a practical matter, it is not possible to use a gas thermometer to measure absolute zero temperature since the gases tend to condense into a liquid long before the temperature reaches zero. It is possible, however, to extrapolate to absolute zero by using the ideal gas law, as shown in the figure.\n",
"Thermal conduction property of any gas under standard conditions of pressure and temperature is a fixed quantity. This property of a known reference gas or known reference gas mixtures can, therefore, be used for certain sensory applications, such as the thermal conductivity analyzer.\n"
] |
how does overall wealth actually increase? | When we convert raw materials into other resources, the value increases.
Raw steel and rocks isn’t that useful, but build a building and you can house people/do commercial activities. Wood isn’t useful, but you can print knowledge on paper and books are more valuable than raw wood.
This concept extends to ideas, not just physical materials. A new technology like self-driving cars increases the value of the economy. A new app that allows you to easily order food delivery also adds value.
As Long as economic activity exists, humans are constantly transforming resources, and value will increase. | [
"Wealth concentration is the process by which, under certain conditions, newly created wealth concentrates in the possession of already-wealthy individuals or entities. Accordingly, those who already hold wealth have the means to invest in new sources of creating wealth or to otherwise leverage the accumulation of wealth, thus are the beneficiaries of the new wealth. Over time, wealth concentration can significantly contribute to the persistence of inequality within society. Thomas Piketty in his book \"Capital in the Twenty-First Century\" argues that the fundamental force for divergence is the usually greater return of capital (r) than economic growth (g), and that larger fortunes generate higher returns.\n",
"A 2015 paper by researchers for the International Monetary Fund argues that there is no trickle-down effect as the rich get richer: [I]f the income share of the top 20 percent (the rich) increases, then GDP growth actually declines over the medium term, suggesting that the benefits do not trickle down. In contrast, an increase in the income share of the bottom 20 percent (the poor) is associated with higher GDP growth.\n",
"In macroeconomic theory the 'wealth effect' may refer to the increase in aggregate consumption from an increase in national wealth. One feature of its effect on economic behavior is the wealth elasticity of demand, which is the percentage change in the amount of consumption goods demanded for each one-percent change in wealth.\n",
"Since wealth does not change proportionately with income from individual to individual or from year to year, we should get the result that high income leads to a low average propensity to consume while looking at the data across persons or over short periods of time. However, generally over a long period of time, wealth and income increase together, which leads to a constant ratio \"\" and thus a constant average propensity to consume. To further analyse the implications of the life-cycle model, we start by considering the case of a \"stationary economy\" in which population and productivity are constant through time. Then, we relax these assumptions one by one.\n",
"The wealth of households amounts to US$280 trillion (2017). According to the eighth edition of the Global Wealth Report, in the year to mid-2017, total global wealth rose at a rate of 6.4%, the fastest pace since 2012 and reached US$280 trillion, a gain of US$16.7 trillion. This reflected widespread gains in equity markets matched by similar rises in non-financial assets, which moved above the pre-crisis year 2007's level for the first time this year. Wealth growth also outpaced population growth, so that global mean wealth per adult grew by 4.9% and reached a new record high of US$56,540 per adult. Tim Harford has asserted that a small child has greater wealth than the 2 billion poorest people in the world combined, since a small child has no debt.\n",
"Research indicates that wealth is related to many positive outcomes in life. Such outcomes include: improved health and mental health, greater longevity, lower rates of infant mortality, experience fewer stressful life events, and less frequently the victims of violent crimes However, research suggests that wealth has a smaller impact on SWB than people generally think, even though higher incomes do correlate substantially with life satisfaction reports.\n",
"Wealth concentration is a process by which created wealth, under some conditions, can become concentrated by individuals or entities. Those who hold wealth have the means to invest in newly created sources and structures of wealth, or to otherwise leverage the accumulation of wealth, and are thus the beneficiaries of even greater wealth.\n"
] |
Is our solar system falling through space? | > Are we "falling?"
In the sense that orbiting celestial bodies are in an [inertial frame of reference](_URL_0_), and falling while on earth also places you in an inertial reference frame, then yes, stars and planets are "falling".
But don't confuse that with there being some sort of universal "down" direction that everything's falling toward. Rather, orbiting bodies are essentially in a constant state of free-fall around the body that they're orbiting -- always falling, but with enough "sideways" velocity to continuously "miss". | [
"It is a common misconception that this collision will disrupt the orbits of the planets in the Solar System. Although it is true that the gravity of passing stars can detach planets into interstellar space, distances between stars are so great that the likelihood of the Milky Way–Andromeda collision causing such disruption to any individual star system is negligible. Although the Solar System as a whole could be affected by these events, the Sun and planets are not expected to be disturbed.\n",
"These objects are \"leaving\" the Solar System because their velocity and direction are taking them away from the Sun, and at their distance from the Sun, its gravitational pull is not sufficient to pull these objects back or into orbit. They are not impervious to the gravitational pull of the Sun and are being slowed down, but they have enough velocity to coast into interstellar space, i.e. retaining sufficient escape velocity to leave the Solar System.\n",
"During a routine hyperspace jump, an accident involving a small meteoroid striking into the machinery causes the ship to be trapped in a stasis until billions of years have passed. They emerge in the Solar System's far future, at which time the sun has become a greenish-white dwarf and Earth has lost its atmosphere and become a tidally locked world; i.e., it only presents \"one face\" to the sun. The ship's main computer has also been damaged, so its decision to have the captain replaced by one of the passengers to maximize survival causes disagreement. The damage to the ship prevents it traveling faster than light, and the passengers and crew debate using the ship's remaining sub-light engine to travel relativistically to a neighboring star to look for a more viable planet.\n",
"The Solar System is stable in human terms, and far beyond, given that it is unlikely any of the planets will collide with each other or be ejected from the system in the next few billion years, and the Earth's orbit will be relatively stable.\n",
"This is a list of all spacecraft landings on other planets and bodies in the Solar System, including soft landings and both intended and unintended hard impacts. The list includes orbiters that were intentionally crashed, but not orbiters which later crashed in an unplanned manner due to orbital decay.\n",
"According to the idea, the solar system had its origin in a gigantic star into which a smaller, dead, waterlogged star fell. This impact caused a huge explosion that flung fragments of the smaller star out into interstellar space where the water condensed and froze into giant blocks of ice. A ring of such blocks formed, that we now call the Milky Way, as well as a number of solar systems among which was our own, but with many more planets than currently exist.\n",
"On 29 April, Roscosmos officially announced that the spacecraft was out of control and its orbit would eventually decay to fall back into Earth's atmosphere, with multiple systems suffering from failure and the main engine's fuel lines depressurized. The spacecraft was expected to disintegrate in the Earth's atmosphere between May 7 and 11. On the same day, the United States' NORAD reported that 44 pieces of debris \"in the vicinity of the resupply vehicle and its upper stage rocket body\" were being tracked by space tracking systems. Currently, various Russian sources reported that the potential cause of the anomaly may be related to the upper stage rocket engine shutdown or with the separation of the Progress spacecraft from the upper stage. A representative of the United States Air Force claimed that debris in the area indicated a blast.\n"
] |
why a bunch of people have birthdays the same day? | You expect to see lots of pairs (we'd need more precise data to determine whether your group of friends shows more than the expected number, however).
Although this is counterintuitive at first glance, it's actually fairly obvious if you look at it the right way.
The point is that although the chance of any two people sharing a birthday is quite low (1/365), there are so many pairs of people that this *could* happen to, that it becomes almost inevitable that it *will* happen to a fair number of pairs.
eg with 200 people, there are 19,900 different pairs of people, so we'd expect a lot of matches.
Indeed with only 23 people (so 253 possible pairs of people) there is already 50/50 chance you get at least one pair sharing a birthday.
| [
"According to a public database of births, birthdays in the United States are quite evenly distributed for the most part, but there tend to be more births in September and October. This may be because there is a holiday season nine months before (the human gestation period is about nine months), or because the longest nights of the year also occur in the Northern Hemisphere nine months before. However, it appears the holidays have more of an effect on birth rates than the winter: New Zealand, a Southern Hemisphere country, has the same September and October peak with no corresponding peak in March and April. The least common birthdays tend to fall around public holidays, such as Christmas, New Years Day and fixed-date holidays such as July 4 in the US. This is probably due to hospitals and birthing centres not offering labor inductions and elective Caesarean sections on public holidays.\n",
"In New Zealand, the most common birthday is September 29, and the least common birthday is December 25. The ten most common birthdays all fall within a thirteen-day period, between September 22 and October 4. The ten least common birthdays (other than February 29) are December 24–27, January 1–2, February 6, March 22, April 1 and April 25. This is based on all live births registered in New Zealand between 1980 and 2017.\n",
"In Judaism, the perspective on birthday celebrations is disputed by various rabbis, although today it is accepted practice by most of the faithful. In the Hebrew Bible, the one single mention of a celebration being held in commemoration of someone's day of birth is for the Egyptian Pharaoh which is recorded in . Rabbi Moshe Feinstein always acknowledged birthdays. The Lubavitcher Rebbe encouraged people to celebrate their birthdays, by gathering friends, making positive resolutions, and through various religious observances. According to Rabbi Yissocher Frand, the anniversary of a person's birth is a special day for that person's prayers to be accepted.\n",
"It may well seem surprising that a group of just 23 individuals is required to reach a probability of 50% that two individuals in the group have the same birthday: this result is perhaps made more plausible by considering that the comparisons of birthday will actually be made between every possible pair of individuals = 23 × 22/2 = 253 comparisons, which is well over half the number of days in a year (183 at most), as opposed to fixing on one individual and comparing their birthday to everyone else's birthday.\n",
"BULLET::::- Birthday parties should be celebrated on or after one's birthday, not before. So when one's birthday falls during the week, it's best to celebrate the following weekend. And never give someone birthday wishes before their birthday.\n",
"BULLET::::- Birthdays are the most common type of anniversary, on which someone's birthdate is commemorated each year. The actual celebration is sometimes moved for practical reasons, as in the case of an official birthday.\n",
"The birthday problem asks, for a set of randomly chosen people, what is the probability that some pair of them will have the same birthday? By the pigeonhole principle, if there are 367 people in the room, we know that there is at least one pair who share the same birthday, as there are only 366 possible birthdays to choose from (including February 29, if present). \n"
] |
why do we feel the need to play with our phone or read something while pooping? | It's boring. We need something to keep our minds occupied. Reader's Digest was the original smartphone for that. | [
"For students who know how to read, but need extra encouragement, giving a book talk is a way to inspire reading. It is an especially effective tool with reluctant readers who need a hook before they will invest the energy into reading a book. Reading motivation for children can be enhanced when it is read with songs or music playing.\n",
"We have become so used to using the internet and different websites that we do not read them any more but rather scan through them because we are usually in a hurry to find something and have become so used to web pages that there is no need for us to read through them completely as we can successfully filter through and find only the information we need and read more about it should the information found not suffice our needs.\n",
"More recently, they have turned their attention to how learning to read may depend on a process of \"neuronal recycling\" that causes brain circuits originally evolved for object recognition to become tuned to recognize frequent letters, pairs of letters and words, and have tested these ideas examining brain responses in a group of adults who did not learn to read due to social and cultural constraints.\n",
"Liberman also examined why reading is more difficult than speech perception. He attributed this greater difficulty to the human biological adaptation to speech. Liberman discovered that children who fail to learn to read on schedule lack phonemic awareness. Phonemic awareness is an awareness that word forms breaks down into individual parts. This is because they cannot appreciate the alphabetic principle.\n",
"Texting on a phone distracts participants, even when the texting task used is a relatively simple one. Stavrinos et al. investigated the effect of other cognitive tasks, such as engaging in conversations or cognitive tasks on a phone, and found that participants actually have reduced visual awareness. This finding was supported by Licence et al., who conducted a similar study. For example, texting pedestrians may fail to notice unusual events in their environment, such as a unicycling clown. These findings suggest that tasks that require the allocation of cognitive resources can affect visual attention even when the task itself does not require the participants to avert their eyes from their environment. The act of texting itself seems to impair pedestrians' visual awareness. It appears that the distraction produced by texting is a combination of both a cognitive and visual perceptual distraction. A study conducted by Licence et al. supported some of these findings, particularly that those who text while walking significantly alter their gait. However, they also found that the gait pattern texters adopted was slower and more \"protective\", and consequently did not increase obstacle contact or tripping in a typical pedestrian context.\n",
"In general, go players refer to analysis of positions as \"reading\". One major purpose of reading is to be sure that a local position can be neglected for a while. For instance, a player may be able to make gains by playing for a certain patch of territory. Yet, this play may be worth only a few points, and thus deemed unnecessary, depending on the state of the game. With confidence in one's reading, it becomes much easier to set priorities and switch around the board (see sente). Not changing gears at the correct time can be a loss of opportunity.\n",
"Students learn when they are motivated and curious about something. Traditional verbal instructions can be boring and painful for students. However, use of audio-visual provides intrinsic motivation to students by peaking their curiosity and stimulating their interests in the subjects.\n"
] |
why does stroking animals relax/calm us down? | i covered this topic in a class in university way back in the caveman days they would sit around the fire with their half wild dogs stroking their fur elicited the guard guard guard instinct in the animal thats the theory anyways so basically the theory is we were able to relax knowing we were protected | [
"Humans also often seek to mimic animals' communicative signals in order to interact with them. For example, cats have a mild affiliative response of slowly closing their eyes; humans often mimic this signal towards a pet cat to establish a tolerant relationship. Stroking, petting and rubbing pet animals are all actions that probably work through their natural patterns of interspecific communication.\n",
"When no premedications are used, alfaxalone causes animals (especially cats) to be agitated when recovering. Dogs and cats will paddle in the air, vocalize excessively, may remain rigid or twitch, and have exaggerated reactions to external stimuli such as light and noise. For this reason, it is recommended that animals recovering from anesthesia by alfaxalone stay in a quiet, dark area.\n",
"Animals sense that Chat can understand them and become very friendly around her. Even when an animal is normally aggressive, Chat can gain that animal's loyalty (she once got a criminal's bulldog to turn on his owner by telling him his master was \"bad\"). Chat often uses this power to calm down nervous and wounded animals at animal rescue centers.\n",
"Because dogs often bark excessively due to stress, boredom, or frustration, changing aspects of an animal's environment to make them more content is a suitable way to quiet them down, rather than forcibly silencing a distressed animal. Spending more time with an animal, such as playing, walking, and other bonding activities, will keep them occupied and make them feel more at ease. If the animal is stressed, it is best to remove the object that is causing them discomfort.\n",
"Parental soothing (by rocking, holding etc) in infancy lays the foundations of the capacity to self-calm. Thereafter transitional objects can help maintain calmness, while pets as self-objects also promote soothing and calm.\n",
"Comfort behaviours are performed from an early age and change little during development. Several comfort behaviours are associated with the beginning of a rest period (e.g. grooming), whereas others are associated with the end of a rest period (e.g. stretching), possibly to prepare the body for escape or hunting. Others, (e.g. dust bathing) will be performed only when the appropriate internal and external stimuli are present (see also sham dustbathing). Animals generally perform comfort behaviours only when they are not engaged in essential activities (e.g. feeding, drinking, hunting, escape); these behaviours are therefore sometimes categorised as \"luxury activities\". However, animals can be highly motivated to perform some comfort behaviours (e.g. dust bathing in hens), and conditions that thwart these behaviours (e.g. battery cages) are considered to have a negative influence on animal welfare.\n",
"Generally if any animal is anxious during a thunderstorm or any similar, practically harmless event (e.g. fireworks display), it is advised to simply continue behaving normally, instead of attempting to comfort animals. Showing fearlessness is, arguably, the best method to \"cure\" the anxiety.\n"
] |
What affects continental drift? | Here's a reconstruction of the last ~250 million years, which basically shows the break up of Pangea. The thing to remember is that Pangea is only the most recent supercontinent; there have been at least 6 or 7 over Earth's 4.5 billion year history. _URL_0_
The driving force, very simply, is gravity. Thermal buoyancy in the mantle means that convection cells get set up, and these drag the surface plates along with them. Subduction oceanic slabs are a big part of this, as they draw dense cold material back down into the mantle. New oceanic crust gets formed in mid ocean ridges. There's practically no oceanic crust on the planet older than ~200 million years, while continental crust can be viewed as a silica-rich scum which is not dense enough to sink back into the mantle to get recycled. As a result continental crust is up to ~ 4 billion years old in places. Continents and supercontinents which have been formed can be rifted apart again by rising and divergent mantle convection cells - we can see this happening at the moment in the Afar region of E Africa, where a rift valley is forming which could ultimately form a new ocean basin.
Meterorite impacts have had no recognised impact on plate tectonics (the timescales of mantle flow are in the millions of years). | [
"Continental drift is the theory which emerged in the early 20th Century that the Earth's continents have moved over geologic time relative to each other, thus appearing to have \"drifted\" across the ocean bed. The idea of continental drift was subsumed by the theory of plate tectonics in the mid-20th century. Plate tectonics explains that the continents move by riding on plates of the Earth's lithosphere. Frankel's four volume work, \"The Continental Drift Controversy\" (\"Volume 1: Wegener and the Early Debate; Volume 2: Paleomagnetic Support for Shifting Continents; Volume 3: Initiation of Seafloor Spreading; and Volume 4: Evolution into Plate Tectonics\"), published in 2012 by Cambridge University Press, is generally considered seminal and definitive in the field of earth sciences. The work is based upon critical analysis of the entire primary literature and Frankel's 35 years of active correspondence with the leading figures during the revolution's climactic final quarter.\n",
"Continental drift is the theory that the Earth's continents have moved over geologic time relative to each other, thus appearing to have \"drifted\" across the ocean bed. The speculation that continents might have 'drifted' was first put forward by Abraham Ortelius in 1596. The concept was independently and more fully developed by Alfred Wegener in 1912, but his theory was rejected by many for lack of any motive mechanism. Arthur Holmes later proposed mantle convection for that mechanism. The idea of continental drift has since been subsumed by the theory of plate tectonics, which explains that the continents move by riding on plates of the Earth's lithosphere.\n",
"Continental drift without expansion was proposed by Frank Bursley Taylor, who suggested in 1908 (published in 1910) that the continents were moved into their present positions by a process of \"continental creep\". In a later paper he proposed that this occurred by their being dragged towards the equator by tidal forces during the hypothesized capture of the moon in the Cretaceous, resulting in \"general crustal creep\" toward the equator. Although his proposed mechanism was wrong, he was the first to realize the insight that one of the effects of continental motion would be the formation of mountains, and attributed the formation of the Himalayas to the collision between the Indian subcontinent with Asia. Wegener said that of all those theories, Taylor's, although not fully developed, had the most similarities to his own. In the mid-20th century, the theory of continental drift was referred to as the \"Taylor-Wegener hypothesis\", although this terminology eventually fell out of common use.\n",
"In 1912 Alfred Wegener proposed the theory of Continental Drift. This theory suggests that the shapes of continents and matching coastline geology between some continents indicates they were joined together in the past and formed a single landmass known as Pangaea; thereafter they separated and drifted like rafts over the ocean floor, currently reaching their present position. Additionally, the theory of continental drift offered a possible explanation as to the formation of mountains; Plate Tectonics built on the theory of continental drift.\n",
"Paleomagnetists led the revival of the continental drift hypothesis and its transformation into plate tectonics. Apparent polar wander paths provided the first clear geophysical evidence for continental drift, while marine magnetic anomalies did the same for seafloor spreading. Paleomagnetism continues to extend the history of plate tectonics back in time and are applied to the movement of continental fragments, or terranes.\n",
"Alfred Wegener's theory of continental drift had never gained much scientific support due to its lack of any satisfactory mechanism to drive the process. During the 1950s, however, extensive surveys of the ocean floor revealed a global, linked system of mid-ocean ridges, all of which exhibited high thermal flow and considerable seismic activity. Hess hypothesized that new ocean crust was being formed at the ocean ridges by extrusions of magma from the Earth's mantle, and that convection currents within the mantle were continuously carrying the newly formed crust away from the ridge, widening the ocean basin and pushing the continents apart.\n",
"Alfred Wegener proposed the theory of continental drift in 1912. He stated: \"the Mid-Atlantic Ridge ... zone in which the floor of the Atlantic, as it keeps spreading, is continuously tearing open and making space for fresh, relatively fluid and hot sima [rising] from depth\". However, Wegener did not pursue this observation in his later works and his theory was dismissed by geologists because there was no mechanism to explain how continents could plow through ocean crust, and the theory became largely forgotten.\n"
] |
why we have the right to bear arms (guns), but not swords? | If the Congress of the United States tried to pass a law unreasonably restricting your right to keep and bear a sword, that law would be challenged on the same grounds as a law unreasonably restricting your right to keep and bear a gun.
"Arms" means arms. It doesn't mean *fire*arms specifically. | [
"The people's right to have their own arms for their defense is described in the philosophical and political writings of Aristotle, Cicero, John Locke, Machiavelli, the English Whigs and others. Though possessing arms appears to be distinct from \"bearing\" them, the possession of arms is recognized as necessary for and a logical precursor to the bearing of arms. Don Kates, a civil liberties lawyer, cites historic English usage describing the \"right to keep and bear \"their private arms\".\"\n",
"The right to keep and bear arms (often referred to as the right to bear arms) is the people's right to possess weapons (arms) for their own defense. Only few countries recognize people's right to keep and bear arms and protect it on statutory level, and even fewer protect the right on constitutional level.\n",
"BULLET::::- 3. The right to keep and bear arms for the common defense, is a great political right. It respects the citizens on the one hand, and the rulers on the other; and although this right must be inviolably preserved, it does not follow that the legislature is prohibited from passing laws regulating the manner in which these arms may be employed.\n",
"BULLET::::- 3. The right to keep and bear arms for the common defense, is a great political right. It respects the citizens on the one hand, and the rulers on the other; and although this right must be inviolably preserved, it does not follow that the legislature is prohibited from passing laws regulating the manner in which these arms may be employed.\n",
"Generally, where modern constitutions refer to arms at all, the purpose is \"to allow the government to regulate their use or to compel military service, not to provide a right to bear them\". Constitutions which historically guaranteed a right to bear arms are those of Bolivia, Colombia, Costa Rica, Guatemala, Honduras, Liberia, Mexico, Nicaragua and the United States of America. Nearly all of the Latin American examples were modelled on that of the United States. At present, out of the world’s nearly 200 constitutions, three still include a right to bear arms: Guatemala, Mexico, and the United States; of these three, only the last does not include explicit restrictive conditions.\n",
"The U.S. Supreme Court in the case \"District of Columbia v. Heller\", 554 U.S. 570 (2008) ruled that \"the right to bear arms\" is an individual right and a right to arms in common use are protected under the Second Amendment to the United States Constitution. The Court further ruled that this right applies against the states in \"McDonald v. Chicago\", 561 U.S. 742 (2010).\n",
"The right to bear arms in English history is regarded in English law as a subordinate auxiliary right of the primary rights to personal security, personal liberty, and private property. According to Sir William Blackstone, \"The ... last auxiliary right of the subject ... is that of having arms for their [defense], suitable to their condition and degree, and such as are allowed by law. Which is ... declared by ... statute, and is indeed a public allowance, under due restrictions, of the natural right of resistance and self-preservation, when the sanctions of society and laws are found insufficient to restrain the violence of oppression.\"\n"
] |
What are the greatest "missing" objects that are probably still in existence? (stolen etc.) | Actually, there are a lot of papyri and archeological pieces from the ancient Egypt which have never been studied by archeologists and egyptologists. These numerous missing objects are actually in the hands of collectionners.
This is the result of the state of egyptology in the 18th and 19th centuries : Egyptology as a science just started with the decipherment of the hieroglyphics, in 1822. Before that, and until the creation of the Supreme Council of Antiquities in 1858 by Auguste Mariette, egyptian antiquities have been stolen because of their value and the mysticism attached to the old egyptian civilisation. | [
"The museum announced in July 2006, that 221 minor items, including jewelry, Orthodox icons, silverware and richly enameled objects, had been stolen. The value of the stolen items was estimated to be approximately $543,000 but by the end of 2006 several of the stolen items were recovered.\n",
"Altogether, thirteen pieces were stolen at an estimated loss of $500 million, making the robbery the largest recorded private property theft in history. Empty frames remain hanging in the museum, both in homage to the missing works and as placeholders for their potential return. One of the paintings, \"The Concert\", was Gardner's first major acquisition and one of only 34 known Vermeer works in the world. It is thought to be the most valuable unrecovered stolen painting, with a value estimated at over $200 million. Another painting, \"The Storm on the Sea of Galilee\", is Rembrandt's only known seascape. The bronze finial was taken from the top of a Napoleonic flag, possibly appearing like gold to the thieves. The museum is offering a $100,000 reward for this piece alone.\n",
"The stolen works had originally been purchased by art collector Isabella Stewart Gardner (1840–1924) and intended to be left on permanent display at the museum with the rest of her collection. Since the collection and its layout are permanent, empty frames remain hanging both in homage to the missing works and as placeholders for their potential return. Experts are puzzled by the choice of paintings that were stolen, especially since more valuable artwork was left untouched. Among the stolen works was \"The Concert\", one of only 34 known works by Vermeer and thought to be the most valuable unrecovered painting, valued at over $200 million. Also missing is \"The Storm on the Sea of Galilee\", Rembrandt's only known seascape. Other works by Rembrandt, Degas, Manet, and Flinck were also stolen.\n",
"The stolen objects were: a small Japanese lacquered box on a stand, a sculpture in green soapstone, a red lacquered chalice with a lid, a chalice carved from a rhinoceros horn, a small blackened, bronze teapot and a plate made of musk wood. Several other pieces were damaged during the break-in. Detailed descriptions and photos of the stolen items can be found at the referenced link. , none of the stolen objects has been recovered and no arrests have been made.\n",
"Ten objects, among them one of the inscribed rings, were stolen shortly after the find was made, and when the remaining objects were recovered, it was discovered that the other ring had been cut into at least four pieces by a Bucharest goldsmith, whereby one of the inscribed characters had become damaged to the point of illegibility. Fortunately, detailed drawings, a cast, and a photograph made by London's Arundel Society of the ring before it was damaged survive, and the nature of the lost character can be established with relative certainty.\n",
"The larger find was intact but the smaller had been damaged by a plough. A previous landowner who visited the excavation commented that he had found metal wires around the find-spot several years earlier, but thinking that they were only steel wire, he had thrown them away. It was therefore concluded that the treasure had originally been even larger.\n",
"In 2004, it was discovered that dozens of rare books from its collection had been stolen. The subsequent investigation revealed that the thief was a senior librarian working at the National Library. At least 62 books were stolen and only a few have been recovered, some with the aid of FBI. Some of the books still missing are works by Johannes Kepler, Thomas Hobbes, and Christiaan Huygens. The library maintains a list of the missing books.\n"
] |
Why can't I remember a smell or taste the same way I can an image or a sound? | Perfumer here.
With training any person would be able to replicate smells inside their heads as well as any visual or auditory input. The main problem is cultural. Our western society does not value the sense of smell as highly as other senses: children are not taught to notice odors, our olfactory "vocabulary" is really limited, we are not used to rely on our sense of smell on a day-to-day basis etc.
The Jahai people in the Malayan peninsula is the best example I can remember of a culture that highly praises the sense of smell, having even specific vocabulary to describe odors: [an article on Cognitive magazine about that](_URL_0_)
edit: formatting.
edit 2: removing link to non-scientific article.
edit 3: changed "remembering" to "replicating inside the head". | [
"The only thing that is currently agreed upon is that the brain does actually group different information, and many associations are instantly created when viewing or remembering images, numbers or sounds.\n",
"An odor can cue recall of a distant memory. Most memories that pertain to odor come from the first decade of life, compared to verbal and visual memories which usually come from the 10th to 30th years of life. Odor-evoked memories are more emotional, associated with stronger feelings of being brought back in time, and have been thought of less often as compared to memories evoked by other cues.\n",
"Certain smells can be associated with specific areas and help a person with vision problems to remember a familiar area. This way there is a better chance of recognizing an area's layout in order to navigate themselves through. The same can be said for people as well. Some people have their own special odor that a person with a more trained sense of smell can pick up. A person with an impairment of their vision can use this to recognize people within their vicinity without them saying a word.\n",
"When odors activate the olfactory pathways that lead to the limbic portion of the brain they trigger the release of neurotransmitters that affect the brain and mental state of the individual in a variety of ways. Stimuli transmitted to the limbic system cannot be consciously blocked, so all olfactory stimuli influence our emotions. Smell has not been studied in as much depth as vision and hearing. The brain is able to process small differences in smell and the sense of smell may last longer in the aging process than sight and hearing. \n",
"Recognition memory is not confined to the visual domain; we can recognize things in each of the five traditional sensory modalities (i.e. sight, hearing, touch, smell, and taste). Although most neuroscientific research has focused on visual recognition, there have also been studies related to audition (hearing), olfaction (smell), gustation (taste), and tactition (touch).\n",
"Odor memory is weaker than visual memory, achieving a successful identification rate of only 70-80% of visual memory. Levels-of-processing effects have been found within odor memory if subjects are asked to \"visualize\" smells and associate them with a particular picture. Subjects who perform this task have a different recall value on explicit memory tests than subjects who memorize smells using self-chosen methods. The difference in recall value, however, depends on the subject, and the subject's ability to form images from odors. Attributing verbal attributes to odors has similar effects. Semantic processing of odors (e.g. attributing the \"mud\" odor to \"smell like a puddle\") has found to have the most positive effects on recall.\n",
"An experiment from 1966 showed that people remember a group of words better if they are within the same theme category. Such words that generate recall by association are known as \"semantic cues\". If the sound of the word is emphasized during the encoding process, a cue that could be used could also put emphasis on the phonetic quality of the word.\n"
] |
Anyone know of any mafia families who had their sons serve in World War II? Any post-WWII crime bosses who were veterans? | One of my favorite fiction books is *The Fortunate Pilgrim* by Mario Puzo, and it's about an Italian-American family living in New York. One of the sons of the family is involved with organized crime (the Italian mafia, if you will) and another is conscripted to go fight WWII. The dynamic between the brothers is great. I recommend reading it, especially if you're going to try to write something similar. It sounds like you intend to focus more on the war aspect than Puzo did (it's only a very short moment in the book), so I think you can easily avoid repeating any of his ideas. | [
"His life parallels that of his close friend Paolo Borsellino. They both spent their early years in the same neighbourhood in Palermo. Though many of their childhood friends grew up in the Mafia background, both men fought on the other side of the war as prosecuting magistrates. They were both killed in 1992, a few months apart. In recognition of their tireless effort and sacrifice during the anti-mafia trials, they were both awarded the Italian \"Medaglia d'oro al valore civile\" (Gold medal for civil valour). They were also named as heroes of the last 60 years in the 13 November 2006 issue of \"Time Magazine\".\n",
"Born in San Giuseppe Jato. His grandfather and great-grandfather, both farmers, were made members of the Mafia. His father Bernardo Brusca, a local Mafia patriarch, served concurrent life sentences for numerous homicides. Bernardo Brusca allied himself with the Corleonesi of Salvatore Riina and Bernardo Provenzano when he replaced Antonio Salamone as capo mandamento of San Giuseppe Jato, paving the way for his three sons’ careers – apart from Giovanni, his younger brother Vincenzo and elder brother Emanuele.\n",
"According to his army enlistment record, Louis Dragna spent two years in college. He started to become involved in the crime family in the 1940s. Under his uncle Jack, the Mafia in Los Angeles was growing into a very widespread enterprise. Louis has an arrest record dating back to 1946. Dragna became a made man in 1947 along with Jimmy Fratianno, Dominic Brooklier, Joseph Dippolito, and Salvatore \"Dago Louie\" Piscopo. Louis Dragna was eventually promoted to Captain (caporegime) in the family by his uncle. Some say that Louis never \"made his bones\" i.e. committed a murder on the Mafia's orders.\n",
"In the years following World War I, in which one of his sons was killed, Maddocks had a reputation as an advocate for disabled ex-servicemen, and was an early member of the Imperial War Graves Commission. He once proposed that convicted criminals who were subsequently killed while serving in the armed forces should have their conviction records erased.\n",
"The crime families originated out of New York City Sicilian Mafia gangs. Salvatore Maranzano formally organized them in the summer of 1931, after the April 15 murder of Giuseppe Masseria, in what has become known as the Castellammarese War. Maranzano introduced the now-familiar Mafia hierarchy: boss (\"capofamiglia\"), underboss (\"sotto capo\"), advisor (\"consigliere\"), captain (\"caporegime\"), soldier (\"soldato\"), and associate; and declared himself \"capo di tutti capi\" (boss of all bosses).\n",
"Thomas \"Tommy\" Lucchese (born Gaetano Lucchese; ; December 1, 1899 – July 13, 1967) was an Italian American gangster and founding member of the Mafia in the United States, an offshoot of the \"Cosa Nostra\" in Sicily. From 1951 until 1967, he was the boss of the Lucchese crime family, one of the Five Families that dominates organized crime in New York City.\n",
"The organization was allied with the Five Mafia Families—specifically the Luciano crime family—in New York, the Chicago Outfit in Chicago, and the Dragna crime family in Los Angeles (prior to Siegel's death). Cohen's family was the primary target for organized crime police squads, particularly the LAPD squad ran by Police Chief Bill Parker called the Gangster Squad, who also targeted Jack Dragna and the family during pre-Cohens reign.\n"
] |
how to differentiate whether a person is chinese, japanese, korean, etc. (honest question - not meant to seem racist) | Sometimes you can tell by their surnames. Common Korean names are Kim, Park, Cho, or Han. Very simple. You can usually recognize a Japanese name, like Takahashi, Nakamura, Hayashi, Yamamoto, etc. - very different from Korean or Chinese names. Japanese names never start with V, X, or Z, but Chinese names may start with X or Z. Common Chinese names are Wang/Wong, Chang, Wu, Yang. But there is some overlap, of course, so use this with a grain of salt. A lot of Asians can't even differentiate by looks most of the time, so don't feel bad. Just ask politely like you're just curious and they probably won't mind telling you. | [
"The concept of as represented in Japanese makes no distinction between racial, ethnic, and national identities. Where the census of the United Kingdom, for example, separates \"ethnic or racial background\" from nationality, the Japanese Census and Statistics Bureau do not distinguish between the two.\n",
"Chinese people in Japan include any people self-identifying as ethnic-Chinese or people possessing Chinese citizenship living in Japan. People aged 22 or older cannot possess dual-citizenship in Japan, so Chinese possessing Japanese citizenship typically no longer possess Chinese citizenship. The term \"Chinese people\" typically refers to the Han Chinese, the main ethnic group living in China (PRC) (including Hong Kong and Macau SARs), Taiwan (ROC), and Singapore. Officially, China (PRC) is home to 55 additional ethnic minorities, including people such as Tibetans, though these people might not self-identify as Chinese. Han Chinese people have had a long history in Japan (as a minority).\n",
"Chinese people are the various individuals or ethnic groups associated with China, usually through ancestry, ethnicity, nationality, citizenship or other affiliation. Han Chinese, the largest ethnic group in China, at about 92% of the population, are often referred to as \"Chinese\" or \"ethnic Chinese\" in English, however there are dozens of other related and unrelated ethnic groups in China.\n",
"In the Chinese culture, individuals often address their friends as juniors and seniors even if they are just a few months younger or older. When a Chinese person asks someone their age they often do this so they know how to address the person.\n",
"Japanese statistical authorities do not collect information on ethnicity, only nationality. As a result, both native and naturalized Japanese citizens are counted in a single group. Although official statistics show near homogeneity, one analysis describe the population as “multi-ethnic”, although unofficial statistics still show that ethnic minorities are small compared with many other countries.\n",
"They currently constitute the second largest ethnic minority group in Japan after Chinese immigrants due to many Koreans assimilating into the general Japanese population. The majority of Koreans in Japan are , often known simply as , who are the permanent ethnic Korean residents of Japan. The term Zainichi Korean refers only to long-term Korean residents of Japan who trace their roots to Korea under Japanese rule, distinguishing them from the later wave of Korean migrants who came mostly in the 1980s, and from pre-modern immigrants dating back to antiquity who may themselves be the ancestors of the Japanese people.\n",
"Ethnic Han Chinese is not synonymous with speakers of the Chinese language. Many non-Han Chinese ethnicities, such as the Hui and Manchu, are essentially monolingual in Chinese, but do not identify as Han Chinese. The Chinese language itself is also a complex entity, and should be described as a family of related languages rather than a single language if the criterion of mutual intelligibility is used to classify its subdivisions.\n"
] |
why do we have phobias that weren't a result of early experiences? | A fear of clowns deals with something known as the "uncanny valley". It applies to objects that are close enough to humans to be recognized as such, but they aren't quite "right".
Features are drawn to be highly exaggerated. Your brain doesn't know how to react. "It's like me... But it's not. It might attack." It's the same reason that people are afraid of dolls. They're so familiar, but something is off. | [
"Another experience that doctors believe leads individuals to develop this phobia is children being abandoned, usually by their parents, when they are very young. This first causes childhood trauma that then persists to affect them as they grow up. This turns into autophobia because they are now afraid that all of the important people in their lives are going to leave or abandon them. Therefore, this particular phobia can come from behavior and experiences that these people have had when they were growing up. However, abandonment does not necessarily mean being left alone physically, this also includes being isolated financially or emotionally. Having drastic, life-altering experiences, particularly causes more trauma which makes this phobia worse. People that have very high anxiety and in this case are more “high strung,” are more susceptible to this phobia.\n",
"Phobias are classified as a type of anxiety disorder. There is often no discernible cause of phobia onset, though Rachman describes three possibilities: classical conditioning, vicarious acquisition and informational/instructional acquisition. Occasionally they are triggered by harmful events surrounding the phobic object or situation - in this case, for example, severe sunburn, chronic light-triggered migraines, or trauma accompanied by bright sunlight.\n",
"A childhood phobia is an exaggerated, intense fear “that is out of proportion to any real fear” found in children. It is often characterized by a preoccupation with a particular object, class of objects, or situation that one fears. A phobic reaction is twofold—the first part being the “intense irrational fear’ and the second part being “avoidance.”\n",
"Phobophobia is mainly linked with internal predispositions. It is developed by the unconscious mind which is linked to an event in which phobia was experienced with emotional trauma and stress, which are closely linked to anxiety disorders and by forgetting and recalling the initiating trauma. Phobophobia might develop from other phobias, in which the intense anxiety and panic caused by the phobia might lead to fearing the phobia itself, which triggers phobophobia before actually experiencing the other phobia. The extreme fear towards the other phobia can lead the patient to believe that their condition may develop into something worse, intensifying the effects of the other phobia by fearing it. Also, phobophobia can be developed when anxiety disorders are not treated, creating an extreme predisposition to other phobias. The development of phobophobia can also be attributed to characteristics of the patient itself, such as phylogenetic influence, the prepotency of certain stimuli, individual genetic inheritance, age incidence, sex incidence, personality background, cultural influence inside and outside the family, physiological variables and biochemical factors. \n",
"Causes of BII phobia have yet to be fully understood. There is a body of evidence which suggests the phobia has genetic underpinnings, though many phobics also cite a traumatic life event as a cause of their fear. The fainting response accompanying the phobia may have originated as an adaptive evolutionary mechanism.\n",
"Phobias are a common form of anxiety disorder, and distributions are heterogeneous by age and gender. An American study by the National Institute of Mental Health (NIMH) found that between 8.7 percent and 18.1 percent of Americans suffer from phobias, making it the most common mental illness among women in all age groups and the second most common illness among men older than 25. Between 4 percent and 10 percent of all children experience specific phobias during their lives, and social phobias occur in one percent to three percent of children and adolescents.\n",
"BULLET::::- Phobias Found in people of all ages. Characterized by an abnormal response to fear or danger. Persons diagnosed with Phobias suffer from feelings of terror and uncontrollable fear, exaggerated reactions to danger that in reality is not life-threatening, and is usually accompanied by physical reactions related to extreme fear: panic, rapid heartbeat, and/or shortened breathing.\n"
] |
through what mechanism is a ventilator an effective treatment for respiratory illness? | The patient can still take extra breaths when the body is signaling it needs more oxygen, but a ventilator takes away the work of breathing (the energy required to move the diaphragm again and again). A patients diaphragm may not be able to keep up with inspiratory demands with the rest of the body needing energy for other things, such as fighting off the virus. I don’t remember exactly how much breathing is in terms of energy usage, but a ventilator (if set to the right deepness, pressure, and frequency of breaths) takes away that work so your body can put it to other uses. | [
"A medical ventilator (or simply ventilator in context) is a machine designed to provide mechanical ventilation by moving breathable air into and out of the lungs, to deliver breaths to a patient who is physically unable to breathe, or breathing insufficiently.\n",
"Ventilators come in many different styles and method of giving a breath to sustain life. There are manual ventilators such as bag valve masks and anesthesia bags that require the users to hold the ventilator to the face or to an artificial airway and maintain breaths with their hands. Mechanical ventilators are ventilators not requiring operator effort and are typically computer-controlled or pneumatic-controlled.\n",
"Mechanical ventilation is often a life-saving intervention, but carries potential complications including pneumothorax, airway injury, alveolar damage, ventilator-associated pneumonia, and ventilator-associated tracheobronchitis. Other complications include diaphragm atrophy, decreased cardiac output, and oxygen toxicity. One of the primary complications that presents in patients mechanically ventilated is acute lung injury (ALI)/acute respiratory distress syndrome (ARDS). ALI/ARDS are recognized as significant contributors to patient morbidity and mortality.\n",
"While in many cases mechanical ventilation is a life-saving or life-preserving intervention, it also has the potential to cause harm to the patient via ventilator-associated lung injury. A number of stresses may be induced by the ventilator on the patient's lung. These include barotrauma caused by pressure, volutrauma caused by distension of the lungs, rheotrauma caused by fast-flowing delivery of gases and atelectotrauma resulting from repeated collapse and re-opening of the lung.\n",
"Ventilating or ventilation (the \"V\" in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.\n",
"People with signs of inadequate respiration or oxygenation may need to be intubated and mechanically ventilated. Mechanical ventilation aims to reduce pulmonary edema and increase oxygenation. Ventilation can reopen collapsed alveoli, but it is harmful for them to be repeatedly opened, and positive pressure ventilation can also damage the lung by overinflating it. Intubation is normally reserved for when respiratory problems occur, but most significant contusions do require intubation, and it may be done early in anticipation of this need. People with pulmonary contusion who are especially likely to need ventilation include those with prior severe lung disease or kidney problems; the elderly; those with a lowered level of consciousness; those with low blood oxygen or high carbon dioxide levels; and those who will undergo operations with anesthesia. Larger contusions have been correlated with a need for ventilation for longer periods of time.\n",
"Modern \"volume ventilators/respirators,\" which deliver an adjustable volume (amount) of air to the person with each breath, are valuable in the treatment of people with muscular dystrophy-related respiratory problems. The ventilator may require an invasive endotracheal or tracheotomy tube through which air is directly delivered, but for some people, noninvasive delivery through a face mask or mouthpiece is sufficient. Positive airway pressure machines, particularly bilevel ones, are sometimes used in this latter way. The respiratory equipment may easily fit on a ventilator tray on the bottom or back of a power wheelchair with an external battery for portability.\n"
] |
Why did the Great Migration in US history start in the 1910s instead of earlier like after the Civil War (1865) or the end of Reconstruction (1877)? | Essentially you've hit the nail on the head with your last sentence
> a perceived lack of opportunity in the North
While the First Great Migration (1910-1930) was largely caused by the brutality of Jim Crow Laws and Lynchings, another reason were the increased job opportunities in the North, which largely didn't exist before 1910. The huge jump in Northern manufacturing capability required a massive boost in labor, which African-Americans would meet. Northern manufacturers like Henry Ford even sent men into the South to recruit black laborers for their factories. Before the Great Migrations, there was simply no pull to the North or West for African Americans. | [
"The decreases in population from 1910–1920, and from 1940–1960, were chiefly caused by different phases of the Great Migration, as African Americans left segregation and oppression of the South to seek better opportunities in the North, during the first phase, and in the West, especially California's defense industry, in the second phase. Tens of thousands of migrants left Louisiana during times of agricultural difficulties and the collapse of agricultural labor after mechanization.\n",
"The Great Depression of the 1930s resulted in reduced migration because of decreased opportunities. With the defense buildup for World War II and with the post-war economic prosperity, migration was revived, with larger numbers of blacks leaving the South through the 1960s. After the political and civil gains of the Civil Rights Movement, in the 1970s migration began to increase again. It moved in a different direction, as blacks traveled to new regions of the South for economic opportunity.\n",
"The Second Wave of Immigration reshaped American society in its diversity and urban numbers leading to an explosion of internal commerce and providing a consumer base for the coming industrial age. At 28 percent, the \"Gilded generation\" fighting the Civil War included a larger share of immigrants than any other generation in America since colonial times.\n",
"As Reconstruction came to an end, between 1870 and 1890, the United States was undergoing a massive population increase. Between 1890 and 1908, rapid industrialization and urbanization brought millions of European immigrants to the country.\n",
"Railroads were the major growth industry, with the factory system, mining, and finance increasing in importance. Immigration from Europe, and the eastern states, led to the rapid growth of the West, based on farming, ranching, and mining. Labor unions became increasingly important in the rapidly growing industrial cities. Two major nationwide depressions—the Panic of 1873 and the Panic of 1893—interrupted growth and caused social and political upheavals. The South, after the Civil War, remained economically devastated; its economy became increasingly tied to commodities, cotton, and tobacco production, which suffered from low prices. With the end of the Reconstruction era in 1877, African-American people in the South were stripped of political power and voting rights, and were left economically disadvantaged.\n",
"The industrial buildup to World War II acted as a \"pull\" factor in the second phase of the Second Great Migration starting in 1940 and lasting until 1970. Altogether in the first half of the 20th century, 6.5 million African Americans migrated from the South to leave lynchings and segregation behind. Unlike the first round, composed chiefly of rural farm workers, the second wave included more educated workers and their families who were already living in Southern cities and towns. In this migration, many left for Western cities in addition to Northeastern and Midwestern cities, as defense industries recruited tens of thousands to higher-paying, skilled jobs. They settled in Los Angeles, San Francisco, Oakland, Phoenix, Portland, and Seattle.\n",
"When the Great Migration started in the 1910s, white southern elites seemed to be unconcerned, and industrialists and cotton planters saw it as a positive, as it was siphoning off surplus industrial and agricultural labor. As the migration picked up, however, southern elites began to panic, fearing that a prolonged black exodus would bankrupt the South, and newspaper editorials warned of the danger. White employers eventually took notice and began expressing their fears. White southerners soon began trying to stem the flow in order to prevent the hemorrhaging of their labor supply, and some began attempting to address the poor living standards and racial oppression experienced by Southern blacks in order to induce them to stay.\n"
] |
The ocean level stands for 0 high. If the ocean level rises, will the understanding of 0 high change too? | The notion of 'sea level' isn't actually the current sea level because that changes from year to year and more profoundly from place to place. Weather, moon, the geography of the water body in the area, and climate change, are just a few of the things that change 'actual' sea level (this is all from [Wikipedia](_URL_0_)).
In science, people are usually trying to describe a standard pressure, which has been generally agreed upon as [standard sea level](_URL_1_) or 101.325 kPa. As for other uses of 'sea-level' where you're literally talking about water level and not just the pressure of a standard system, you're pretty much stuck using the mean water-level or whatever makes sense in the context of what's being described. I doubt that standard pressure will be adjusted anytime soon for increasing global water levels, only because there already remains such a vast variation in sea levels and pressures for the reasons I listed above, but even moreso because the past century of science uses the standard for pretty much everything.
And finally, I'm not sure exactly what you're talking about when you say 0, but you might be talking about a specific datum?
> In the UK, the Ordnance Datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, the datum was MSL at the Victoria Dock, Liverpool.
TL;DR: Standard pressure references probably won't change, but sea-level has already been changing quite profoundly depending on how you look at it. | [
"The \"global mean sea level is projected rise (relative to 1986-2005) by 0.26 to 0.77m by 2100 for 1.5°C global warming\" and about 0.1m more for 2°C. A difference of 0.1m may correspond to 10 million more or fewer people exposed to related risks.\n",
"Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardised geodetic datumthat is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.\n",
"Relative sea level (abbreviated as RSL) is defined as the sea level that is observed with respect to a land-based reference frame. It is often contrasted with eustatic sea level, which is a measure of the total mass or volume of the oceans. Relative sea level can change by the processes changing eustatic sea level (e.g. ice melt and thermal expansion), but also by changes on land such as subsidence and isostatic rebound.\n",
"As the mean level of the sea floor decreases, the volume of the ocean basins increases, and if other factors that can control sea level remain constant, sea level falls. The converse is also true: younger oceanic lithosphere leads to shallower oceans and higher sea levels if other factors remain constant.\n",
"Like in the Atlantic, the global sea level kept on rising during the Subboreal but at a much slower rate. The increase amounted to about 1 m, which corresponds to a rate of 0.3 mm per year. At the end of the Subboreal, the sea level was about 1 m below the current value.\n",
"IPCC (2007a:13, 14) projected sea level rise to the end of the 21st century using the [[Special Report on Emissions Scenarios|SRES]] emission [[economics of global warming#Scenarios|scenarios]]. Across the six SRES marker scenarios, sea level was projected to rise by 18 to 59 cm (7.1 to 23.2 inches). This projection was for the time period 2090–2099, with the increase in level relative to average sea levels over the 1980–1999 period. Due to a lack of scientific understanding, this sea level rise estimate does not include all of the possible contributions of ice sheets.\n",
"The eustatic sea level is the distance from the center of the earth to the sea surface. An increase of the eustatic sea level can be generated by decreasing glaciation, increasing spreading rates of the mid-ocean ridges or more mid-oceanic ridges. Conversely, increasing glaciation, decreasing spreading rates or fewer mid-ocean ridges lead to a fall of the eustatic sea level.\n"
] |
why does bacteria grow faster at certain temperature? | All bacteria have certain temperatures that their enzymes, or proteins in their bodies which process nutrients and other things perform at the maximum rate. As the environment temperature increases, enzyme action increases until it reaches a high enough temperature that enzymes denature, meaning that their substrate area (where enzymes attach to food) unfold, therefore not allowing them to interact with what they are supposed to. As temperature gets colder, enzymes simply work at a slower pace. So I guess the basic answer to your question is that temperature speeds up enzyme activity, allowing them to process nutrients faster allowing for faster growth. Sorry for the lengthy response... | [
"External conditions such as acidity and temperature affect the growth rates of \"Lactobacillus sanfrancisco\". One study found that of temperature of 33 °C (91 °F) leads to maximum growth rates, whereas temperatures over 41 °C (105 °F) completely inhibit the bacteria growth. Ideal and maximum growth temperatures of other organisms may be quite different; for instance a common yeast in sourdough, \"Candida milleri\", prefers 27 °C (81 °F) and will not grow above 36 °C (97 °F).\n",
"Environmental factors influence rate of bacterial growth such as acidity (pH), temperature, water activity, macro and micro nutrients, oxygen levels, and toxins. Conditions tend to be relatively consistent between bacteria with the exception of extremophiles. Bacterium have optimal growth conditions under which they thrive, but once outside of those conditions the stress can result in either reduced or stalled growth, dormancy (such as formation spores), or death.\n",
"All bacteria have their own optimum environmental surroundings and temperatures in which they thrive. Many factors are responsible for a given organism's optimal temperature range, but evidence suggests that the expression of particular genetic elements (alleles) can alter the temperature-sensitive phenotype of the organism. A recently published study demonstrated that mesophilic bacteria could be genetically engineered to express certain alleles from psychrophilic bacteria, consequently shifting the restrictive temperature range of the mesophilic bacteria to closely match that of the psychrophilic bacteria.\n",
"Temperature plays a huge role in the survival of \"B. abortus\". The bacteria can survive for a longer period of time if they are at a cooler temperature. This is why it can transmit through liquids like milk and tap water. \"B. abortus\" can last a lot longer in animals if they aren’t watched closely and if the cattle aren’t getting treatment for it. In humans, it can be caught after noticing signs and the correct tests to determine the type of bacteria.\n",
"In general, bacteria are about 1/10 the size of mammalian cells and produce perhaps 1/10 as much metabolic heat-i.e. ca. 3x10 W/cell. Thus, compared to mammalian cells (see above) ca. 10X as many bacteria—ca. 330,000—must be present to produce detectable heat flow—i.e. 1 μW. However, many bacteria replicate orders of magnitude more rapidly in culture than mammalian cells, often doubling their number in a matter of minutes (see Bacterial growth). As a result, a small initial number of bacteria in culture and initially undetectable by IMC rapidly produce a detectable number. For example, 100 bacteria doubling every 20 minutes will in less than 4 hours produce 330,000 bacteria and thus an IMC-detectable heat flow. Consequently, IMC can be used for easy, rapid detection of bacteria in the medical field. Examples include detection of bacteria in human blood platelet products (Trampuz et al. 2007) and urine (Bonkat \"et al.\" 2011) and rapid detection of tuberculosis (Braissant et al. 2010, Rodriguez et al. 2011). Fig. 7 shows an example of detection times of Tuberculosis bacteria as a function of the initial amount of bacteria present in a closed IMC ampoule containing a culture medium.\n",
"The optimum temperature range for bacterial growth and host symptom development is between 25° to 30 °C. A slower rate of growth is observed at temperatures as low as 5 °C and up to 35 °C. However, infected hosts are symptomless below 18 °C.\n",
"Different species of bacteria are able to survive at different temperature ranges. Ones living optimally at temperatures between 35–40 °C are called mesophiles or mesophilic bacteria. Some of the bacteria can survive at the hotter and more hostile conditions of 55–60 °C, these are called thermophile.Methanogens come from the domain of archaea. This family includes species that can grow in the hostile conditions of hydrothermal vents. These species are more resistant to heat and can therefore operate at high temperatures, a property that is unique to thermophile.\n"
] |
if double jeopardy exists, why can a judge overturn a sentencing and retry someone? | He was already found guilty, the issue here is that the sentence for the guilt was out of line considering the sentencing guidelines.
Double Jeopardy protects from being tried again for the same crime (decision of guilt or not), not protection from an improper trial (hung jury, mistrial, etc). | [
"The Court also explained why the Double Jeopardy Clause permits a second prosecution following reversal for trial error—such as flawed jury instructions, evidentiary rulings, or prosecutorial misconduct—but not for evidentiary insufficiency. Because trial errors \"impl[y] nothing with respect to the guilt or innocence of the defendant,\" the Court reasoned, \"[i]t would be a high price indeed for society to pay were every accused granted immunity from punishment because of any defect sufficient to constitute reversible error in the proceedings leading to conviction.\" Where trial error occurs, a defendant \"has a strong interest in obtaining a fair readjudication of his guilt free from error, just as society maintains a valid concern for insuring that the guilty are punished.\" The same cannot be said after a reversal for insufficiency of the evidence, where the prosecution has already had \"one fair opportunity to offer whatever proof it could assemble.\" What is more, the Court observed, it is no small matter for a reviewing court to reverse a conviction on these grounds, as it \"must sustain the verdict if there is substantial evidence, viewed in the light most favorable to the Government, to uphold the jury's decision.\" The \"prosecution's failure [will be] clear\" in cases where a reviewing court holds otherwise.\n",
"The double jeopardy rule means that a person cannot be tried more than once for the same offence. It is an important safeguard to acquitted defendants, but there is an important general public interest in ensuring that those who have committed serious crimes are convicted of them. The Stephen Lawrence Inquiry Report recognised that the rule is capable of causing grave injustice to victims and the community in certain cases where compelling fresh evidence has come to light after an acquittal. It called for a change in the law to be considered, and we have accepted that such a change is appropriate. The European Convention on Human Rights (Article 4(2) of Protocol 7) explicitly recognises the importance of being able to re-open cases where new evidence comes to light.\n",
"Finally, the Court had held in \"Forman v. United States\" that a new trial following a reversal—no matter the ground—never constitutes double jeopardy: \"It is elementary in our law that a person can be tried a second time for an offense when his prior conviction for that same offense has been set aside by his appeal.\"\n",
"In many European countries, the prosecution may appeal an acquittal to a higher court. This is not regarded as double jeopardy, but as a continuation of the same case. The European Convention on Human Rights permits this by using the phrase \"\"finally\" acquitted or convicted\" (emphasis added) as the trigger for prohibiting subsequent prosecution.\n",
"Among other things, \"[t]he Double Jeopardy Clause forbids a second trial for the purpose of affording the prosecution another opportunity to supply evidence which it failed to muster in the first proceeding.\" The Clause does so to \"protect an individual from being subjected to the hazards of trial and possible conviction more than once for an alleged offense.\" An acquittal triggers this protection. As the Court recently explained: '[T]he law attaches particular significance to an acquittal,' \"United States v. Scott\", so a merits-related ruling concludes proceedings absolutely. This is because '[t]o permit a second trial after an acquittal, however mistaken the acquittal may have been, would present an unacceptably high risk that the Government, with its vastly superior resources, might wear down the defendant so that ‘even though innocent he may be found guilty,’. And retrial following an acquittal would upset a defendant's expectation of repose, for it would subject him to additional 'embarrassment, expense and ordeal' while 'compelling him to live in a continuing state of anxiety and insecurity.'\"\n",
"If a criminal case is brought to trial and the defendant is acquitted, jeopardy is attached to the case and it can never be retried. If the defendant was convicted and his conviction is overturned, jeopardy is not attached because the defendant is considered to simply be in the same state they were before the case was tried.\n",
"Before the Supreme Court, Blueford argued that the Double Jeopardy Clause prohibits a retrial on charges of capital murder and first-degree murder because the foreperson's report that the jury had unanimously voted against those charges acquitted him of those charges. Blueford asserted that even though the jury had not filled out a formal form verdict, the foreperson's clear announcement in open court that the jury had unanimously voted to acquit Blueford of charges constituted a final verdict of acquittal. Additionally, Blueford argued that because the trial court had instructed the jury to consider the lesser included charges only if the jury had unanimously voted to acquit on the more serious charge, the jury's deadlock on manslaughter established that it had acquitted Blueford on capital murder and first-degree murder. Blueford also contended that because a conviction of a lesser included offense implicitly acquits on a more serious offense, a deadlock on a lesser included offense must also implicitly acquit on a more serious offense.\n"
] |
Quick high school chemistry question | They're both technically correct, but your dad is correcter. | [
"After the on-line questions, students will take a test about what they have learned while solving the on-line questions. First grade students in high school take this test. The questions are based on basic chemistry. The test can determine how much the students understand basic chemistry. 80 well-ranked students can join the Summer school 1. About one organic chemistry questions appear in the test. All the tests are held in Konkuk University.\n",
"\"When a freshman girl comes over to a chemistry class, she perhaps leaves a class in cookery, meal planning, or color and design, which has held her interest because of her familiarity with that work and her sympathetic attitude toward it. Entering her chemistry class, she is bewildered by the array of unrecognized pieces of apparatus and the unfamiliar terms used. Can we wonder at the lack of attention in chemistry class as we begin to discuss the law of multiple proportion or the percentage of iron in certain ores? Yet we can demand that attention if we approach the subject by an explanation of how our grandmothers used iron pots and kettles, black and unattractive, heavy and hard to handle, while all the time in the clay around there was an abundance of aluminum.\"\n",
"The Department of chemistry was established in the year 2000 with the destination of offering basic knowledge to the undergraduate students in Science and Technology. It fulfills the basic needs of undergraduate students and strengthens their knowledge in Chemistry.\n",
"The School of Chemistry admits students to its M.Sc. and Ph.D. programmes. The school's curriculum covers all branches of chemistry in keeping with the interdisciplinary nature of the subject today. The school's research and its faculty have gained wide recognition.\n",
"Others point out that, for example, secondary school students will never study the advanced physics that underlies chemistry in the first place. “[I]nclined planes (frictionless or not) didn't come up in ... high school chemistry class ... and the same can be said for some of the chemistry that really makes sense of biological phenomena.” For physics to be relevant to a chemistry course, students have to develop a truly fundamental understanding of the concepts of energy, force, and matter, beyond the context of specific applications like the inclined plane.\n",
"The first part contains 60 multiple-choice questions. Each question has four answer choices. The questions are loosely grouped into 10 sets of 6 items; each set corresponds to a different chemistry topic. Typically, the topics are, in order, descriptive chemistry/laboratory techniques, stoichiometry, gases/liquids/solids, thermodynamics, kinetics, equilibrium, electrochemistry, electronic structure/periodic trends, bonding theories, and organic chemistry. There is no penalty for guessing; a student's score is equal to the number of questions answered correctly. One and a half hours (90 minutes) are allotted for this first part.\n",
"programs in chemistry with the participation of Professor Mustafin: the editor of the program Lyudmila Boiko, a philologist, recollects that the most interesting lessons in chemistry were given to her by professor Mustafin in recording TV programs; to this day she remembers his curious parallels and witty notes. For example, Mustafin stated that chemical reaction is similar to a performance, in which all characters are known, and chemical thermodynamics allows one to peep behind the curtain and find out what will become with the heroes of this performance as a result of the\n"
] |
why do waterproof materials (tents and shower curtains) let water through when something touches it? | They're not really waterproof, is the simple answer. They're mostly waterproof, and rely on angles to shed and wick the water away faster than it would drip out the other side.
This means you can make a relatively light and inexpensive material that still allows for airflow.
As to why your finger makes it come through, it's basically surface tension. When there's nothing touching the inside, the water sticks together and drains down, but when you touch it, the water can stick together and flow onto your finger. | [
"Waterproof/breathable fabrics resist liquid water passing through, but allow water vapour to pass through. Their ability to block out rain and snow while allowing vapour from sweat to evaporate leads to their use in rainwear, waterproof outdoor sports clothing, tents, and other applications.\n",
"Tent fabric may be made of many materials including cotton (canvas), nylon, felt and polyester. Cotton absorbs water, so it can become very heavy when wet, but the associated swelling tends to block any minute holes so that wet cotton is more waterproof than dry cotton. Cotton tents were often treated with paraffin to enhance water resistance. Nylon and polyester are much lighter than cotton and do not absorb much water; with suitable coatings they can be very waterproof, but they tend to deteriorate over time due to a slow chemical breakdown caused by ultraviolet light. The most common treatments to make fabric waterproof are silicone impregnation or polyurethane coating. Since stitching makes tiny holes in a fabric seams are often sealed or taped to block these holes and maintain waterproofness, though in practice a carefully sewn seam can be waterproof.\n",
"Some garments, and tents, are designed to give greater or lesser protection against rain. For urban use raincoats and jackets are used; for outdoor activities in rough weather there is a range of hiking apparel. Typical descriptions are \"showerproof\", \"water resistant\", and \"waterproof\". These terms are not precisely defined. A showerproof garment will usually be treated with a water-resisting coating, but is not rated to resist a specific hydrostatic head. This is suitable for protection against light rain, but after a short time water will penetrate. A water-resistant garment is similar, perhaps slightly more resistant to water but also not rated to resist a specific hydrostatic head. A garment described as waterproof will have a water-repellent coating, with the seams also taped to prevent water ingress there. Better waterproof garments have a membrane lining designed to keep water out but allow trapped moisture to escape (\"breathability\")—a \"totally\" waterproof garment would retain body sweat and become clammy. Waterproof garments specify their hydrostatic rating, ranging from 1,500 for light rain, to 20,000 for heavy rain.\n",
"The application of External Wall Insulation can help to deal with rain penetration problems through solid walls by blocking wind-driven rain. However, it can also make the problem worse if poor detailing (e.g. around eaves) allows water to pass behind the external wall insulation where it can become trapped. A high standard of design and installation should therefore be insisted upon. The dangers of not adequately designing and specifying these systems is dealt with in a research paper written by Joe Malone and published in the CIOB's Construction, Research and Innovation Journal (Volume 4, Issue 4, Dec 2013 The Risky Business of Covering Up)\n",
"Basic outdoor clothing materials are goose down, wool, polyester, and polyolefin, which provide similar degrees of insulation when dry. Wool and polyesters perform reasonably well for most weather conditions and provide some insulation while wet. Cotton/linen wicks moisture, good for hot/humid weather. Cotton, linen and down lose insulation when wet unless they are treated to be water-resistant.\n",
"In a rainscreen the air gap allows the circulation of air on the moisture barrier. (These may or may not serve as a vapour barrier, which can be installed on the interior or exterior side of the insulation depending on the climate). This helps direct water away from the main exterior wall which in many climates is insulated. Keeping the insulation dry helps prevent problems such as mold formation and water leakage. The vapour-permeable air/weather barrier prevents water molecules from entering the insulated cavity but allows the passage of vapour, thus reducing the trapping of moisture within the main wall assembly.\n",
"Weatherstripping around openings – especially doors and windows – is used in buildings to keep out weather, increase interior comfort, lower utility bills, and reduce noise. Builder weatherstripping can be made from felt; vinyl, rubber, or poly foam; EPDM cellular rubber and vinyl tubing; and metals such as brass and aluminum.\n"
] |
how is space debris tracked? | The [US Space Surveillance Network](_URL_0_) includes both ground-based sensors and satellites that do the tracking. | [
"Measurements of near-Earth orbital debris are accomplished by conducting ground-based and space-based observations of the orbital debris environment. Data is acquired using ground-based radars and optical telescopes , space-based telescopes, and analysis of spacecraft surfaces returned from space. Some important data sources have been the U.S. Space Surveillance Network, the Haystack X-Band Radar, and returned surfaces from the Solar Max, Long Duration Exposure Facility (LDEF), and the Space Shuttle spacecraft. The data provide validation of the environment models and identify the presence of new sources.\n",
"Radar and optical detectors such as lidar are the main tools for tracking space debris. Although objects under have reduced orbital stability, debris as small as 1 cm can be tracked, however determining orbits to allow re-acquisition is difficult. Most debris remain unobserved. The NASA Orbital Debris Observatory tracked space debris with a liquid mirror transit telescope. FM Radio waves can detect debris, after reflecting off them onto a receiver. Optical tracking may be a useful early-warning system on spacecraft.\n",
"As of April 2019, 3,000 of the 10,000 pieces of space debris routinely tracked by the US Military as a threat to the International Space Station were known to have originated from the 2007 satellite shoot down.\n",
"On flight day two, the crew deployed the Orbital Debris Radar Calibration System-II (ODERACS-II) to help characterize orbital debris environment for objects smaller than 10 centimeters (about four inches) in diameter. Complement of six target objects of known dimensions and with limited orbital lifespans released into orbit and tracked by ground-based radars, allowing precise calibration of radars so they can more accurately track smaller pieces of space debris in low Earth orbit.\n",
"The system was also tested for space debris tracking and the radars were proven to be capable of statistical observations of Low-Earth orbit (LEO) debris (altitudes of 500 to 1500 km) down to 2 cm in size. Since these measurements are insufficient to determine complete orbits, the radar has only limited space surveillance value. Because the space debris tracking change is only a dedicated back-end computer system, the primary EISCAT observations are not compromised. As a result of that, the EISCAT radars allow continuous monitoring of the LEO debris in a beam park mode, functioning as a space surveillance system part of the European Space Agency's Space Situational Awareness Programme (SSA).\n",
"Returned space hardware is a valuable source of information on the directional distribution and composition of the (sub-millimetre) debris flux. The LDEF satellite deployed by mission STS-41-C \"Challenger\" and retrieved by STS-32 \"Columbia\" spent 68 months in orbit to gather debris data. The EURECA satellite, deployed by STS-46 \"Atlantis\" in 1992 and retrieved by STS-57 \"Endeavour\" in 1993, was also used for debris study.\n",
"The Earth-Orbital Debris Collection (ODC) experiment was deployed on the Mir space station for 18 months during 1996–97 and used aerogel to capture particles from low Earth orbit, consisting of interplanetary dust and man-made particles. Far from being \"the last sample-return mission... in... twenty years\", ODC was a portable version of an LDEF collector, decreasing collection time significantly, and effective area by orders of magnitude.\n"
] |
how can a founder of a company, like papa john, be forced to step down from ceo | Papa John's is a publicly traded company. This means that individuals can buy portions of the company called "shares" and the company can use that money to invest and grow. John Schnatter kept 25% of the company for himself when they went public, but the other 75% was sold in order to grow the brand.
The shareholders are represented by a board of directors. Schnatter has a lot of power, but if they all agreed he shouldn't be CEO then they can make him. They can choose a new CEO. What they *can't* do is take away his 25% of the company.
So he still owns 25% of the company. He still will make millions and millions of dollars from Papa John's. He just doesn't actually *run* the company any more. | [
"In the three years subsequent to the firm being founded, Wasserman concluded 50% of founder CEOs step down. The following year, another 10% step down and by the time the firm has an initial public offering less than 25% of founders still hold the CEO position. This being said, the decision to step down is not always voluntary, four out of five founder CEOs are forced to relinquish their role as CEO by investors.\n",
"Founder CEO succession can occur through both voluntary and involuntary means. Noam Wasserman found in majority of founder CEO successions, the founder is forced to step down by investors. Founder CEOs who successfully execute product development or enter into negotiations with potential outside investors for additional capital have a higher likelihood of being replaced than those who are not as successful with product development and/or do not to raise additional capital. Indicated by several scholars, like Wasserman, as the CEO becomes successful in product development the needs of the firm expand and a mismatch between the current skills of the founder CEO and the new skills needed for the firm's success going forward is likely to occur, increasing the probability of succession. Founder CEOs are generally succeeded by someone from outside the firm. Founder CEO comebacks have occurred when the founder CEO was replaced and later returned to their role as CEO.\n",
"The chastened CEO visits Pinnock's grieving widow and offers her the money that Louis lost when he was fired. She refuses it, and when Thomas awkwardly asks if she wants more, she bluntly says \"How much would ever be enough?\" and closes the door in his face as the movie ends.\n",
"She served as president, chairwoman and CEO of the company until being forced to resign as a result of the ImClone insider trading case. As part of an agreement with the U.S. Securities and Exchange Commission (SEC), she was banned from serving in any role that would allow her to prepare, audit or disclose financial results of a public company until August 2011. In effect, this banned her from serving as an officer of her own company.\n",
"She stepped down as CEO in June 2019 as a consequence of the attention paid to her co-ownership of NSO Group, an Israeli cyberweapons company whose software has allegedly been used by authoritarian regimes to spy on dissidents.\n",
"\"CEOs are the world's unelected leaders. We are given positions of power that are conducive to leaders of a small country. Therefore, we are responsible to make all our decisions with people in mind and not just with the numbers they represent to us.\"\n",
"On 30 March 2017, it was announced that Lapo Civiletti will be the first non-family CEO in the history of the company and will take up the role from 1 September, while Giovanni Ferrero will become the executive chairman focusing on long-term strategy.\n"
] |
How do sunburns go away? | A sunburn isn't the same as a tan. Tans are caused by the production of melanin in the skin as a response to sun exposure. Sunburns are the layers of your skin literally being burned by sunlight, and the redness is caused by inflammation, not pigment. The redness goes away as healing occurs. | [
"Sunburn is caused by UV radiation, either from the sun or from artificial sources, such as tanning lamps, welding arcs, or ultraviolet germicidal irradiation. It is a reaction of the body to direct DNA damage from UVB light. This damage is mainly the formation of a thymine dimer. The damage is recognized by the body, which then triggers several defense mechanisms, including DNA repair to revert the damage, apoptosis and peeling to remove irreparably damaged skin cells, and increased melanin production to prevent future damage. Melanin readily absorbs UV wavelength light, acting as a photoprotectant. By preventing UV photons from disrupting chemical bonds, melanin inhibits both the direct alteration of DNA and the generation of free radicals, thus indirect DNA damage.\n",
"Sunburn is an inflammatory response in the skin triggered by direct DNA damage by UV radiation. When the skin cells' DNA is overly damaged by UV radiation, type I cell-death is triggered and the skin is replaced.\n",
"Sunburn is a form of radiation burn that affects living tissue, such as skin, that results from an overexposure to ultraviolet (UV) radiation, commonly from the Sun. Common symptoms in humans and other animals include red or reddish skin that is hot to the touch, pain, general fatigue, and mild dizziness. An excess of UV radiation can be life-threatening in extreme cases. Excessive UV radiation is the leading cause of primarily non-malignant skin tumors. \n",
"Sunburn causes an inflammation process, including production of prostanoids and bradykinin. These chemical compounds increase sensitivity to heat by reducing the threshold of heat receptor (TRPV1) activation from to . The pain may be caused by overproduction of a protein called CXCL5, which activates nerve fibres.\n",
"Sunburn can occur in less than 15 minutes, and in seconds when exposed to non-shielded welding arcs or other sources of intense ultraviolet light. Nevertheless, the inflicted harm is often not immediately obvious.\n",
"The differential diagnosis of sunburn includes other skin pathology induced by UV radiation including photoallergic reactions, phototoxic reactions to topical or systemic medications, and other dermatologic disorders that are aggravated by exposure to sunlight. Considerations for diagnosis include duration and intensity of UV exposure, use of topical or systemic medications, history of dermatologic disease, and nutritional status.\n",
"Minor sunburns typically cause nothing more than slight redness and tenderness to the affected areas. In more serious cases, blistering can occur. Extreme sunburns can be painful to the point of debilitation and may require hospital care.\n"
] |
why is rent control a bad thing? | One of the main reason capitalism works is that prices somewhat accurately reflect supply and demand. Rent control takes away this information. As a result, there isn't the same incentive to create new developments. Less new development means less supply, which would increase prices, but they're kept artificially low which compounds the problem. You end up with a situation where the government then has to step in to create new housing, because businesses don't find it profitable.
How disastrous it ends up depends on how out of tune the government rent control is with what the open market prices would have been. This isn't like banking regulations or employment insurance though, it's a reduction of information that never ends well. | [
"Rent controls are often enacted due to public pressure and complaints regarding the cost of living. Proponents of rent controls argue that rent controls combat inflation, stabilize the economic characteristics of a city's population, prevent rent gouging, and improve the quality of housing. Capitalist economists have documented that rent control affects the supply and demand relationship in housing markets which can contribute to urban blight and does not provide the benefits its proponents advocate. Rent control contributes to urban blight by reducing new construction and investment in housing and deincentivizing maintenance. If a landlord's costs to perform maintenance consume too large a proportion of profit, that is revenue minus costs, from rent, the landlord will feel pressure to drastically reduce or eliminate maintenance entirely. This effect has been observed in New York City, a 2009 study by a lobbying firm found 29% of rent-controlled buildings were categorized as either deteriorated or dilapidated in contrast with 8% of non-rent-controlled housing .\n",
"Paul Krugman writes that rent control inhibits construction of new housing, creates bitter tenant–landlord relations, and in markets with not all apartments under rent control, causes an increase in rents for uncontrolled units. \n",
"Rent price controls remain the most controversial element of a system of rent regulation. Historically, economists such as Adam Smith and David Ricardo viewed landlords as producing very little that was valuable, and so regarded \"rents\" as an exploitative concept. (Economists note that the land value tax is a way to capture this un-earned value.) Modern rent controls (sometimes called rent leveling or rent stabilization) are intended to protect tenants in privately owned residential properties from excessive rent increases by mandating gradual rent increases, while at the same time ensuring that landlords receive a return on their investment that is deemed fair by the controlling authority, which might, or might not be a legislature.\n",
"The issues involved in rent control are complex and compelling, with multiple dimensions: personal, social, economic, political, legal. Often debates and discussions are at risk of provoking a competition between overstatements. Some proponents may call every raise \"rent gouging\" while some opponents say rent control leads to slums. \"The range of assertions by rent control combatants [can be] astonishing.\" In the worse case, the \"debate becomes a hollow clash of extremes, and the results are an uninformed electorate, rash policy, and a divided community.\" In 'second generation rent control' the issues have become more articulated, yet still contested.\n",
"Generally economists find fault with how rent control works over time: it reduces the supply of housing. In making the opposition argument, such general principles have been applied to California. Pro-rent control arguments are usually adopted by cities when enacting ordinances establishing rent control (see above).\n",
"Economic conclusions are subject to interpretation by the public. Rent control that lowers rents for some can work to raise rents for others. Is it to be deemed 'good for society' if the total benefit amount to those favored with lower rents via rent control is cancelled by the program's unintended effect of raising the rent to others? What if its primary effect is merely to redistribute the cost of rent unequally rather than to reduce it overall. Is there an alternative? The authors of a recent 'Stanford paper' state, \"If society desires to provide social insurance against rent increases, it would be more desirable to offer this subsidy in the form of a government subsidy or tax credit.\"\n",
"Rent control is a system where the government sets a price ceiling on rent (often in combination with eviction limitations and maintenance requirements). When soldiers returned from World War II and started families, which increased demand for apartments, but stopped receiving military pay, many of them could not deal with higher rents. The government put in price controls so that soldiers and their families could pay their rents and keep their homes. However, it increased the quantity demand for apartments and lowered the quantity supplied, and so the number of available apartments rapidly decreased until none were available for latecomers. Price ceilings create shortages when producers are allowed to abdicate market share or go unsubsidized.\n"
] |
How does a computer graph a function? | It plots individual points. "Insane" is an exaggeration. Think about this, say you had a super HD 4K monitor and had the graph going across the entire screen. If the software were to individually compute every pixel it displays... it would only have to compute about 4000 points, one for every x value, which is not hard for a computer at all for most functions, certainly easier than making inferences about arbitrary functions (but not necessarily if the form of the function is known in advance). | [
"In the modern foundations of mathematics, and, typically, in set theory, a function is actually equal to its graph. However, it is often useful to see functions as mappings, which consist not only of the relation between input and output, but also which set is the domain, and which set is the codomain. For example, to say that a function is onto (surjective) or not the codomain should be taken into account. The graph of a function on its own doesn't determine the codomain. It is common to use both terms \"function\" and \"graph of a function\" since even if considered the same object, they indicate viewing it from a different perspective.\n",
"The computer consists of a fixed alphabet of input symbols, and a mutable directed graph (aka a state diagram) with its arrows labelled by alphabet symbols. Each node of the graph has exactly one outgoing arrow labelled with each symbol, although some of these may loop back into the original node. One fixed node of the graph is identified as the start or \"active\" node.\n",
"A computer is a machine that manipulates data according to a set of instructions called a computer program. The program has an executable form that the computer can use directly to execute the instructions. The same program in its human-readable source code form, enables a programmer to study and develop a sequence of steps known as an algorithm. Because the instructions can be carried out in different types of computers, a single set of source instructions converts to machine instructions according to the CPU type.\n",
"BULLET::::- The graph \"G\" is the structure of the computer network. There is one computer for each node of \"G\" and one communication link for each edge of \"G\". Initially, each computer only knows about its immediate neighbors in the graph \"G\"; the computers must exchange messages with each other to discover more about the structure of \"G\". Each computer must produce its own color as output.\n",
"In mathematics, the graph of a function is, formally, the set of all ordered pairs , such that is in the domain of the function . In the common case where and are real numbers, these pairs are Cartesian coordinates of points in the Euclidean plane and thus form a subset of this plane, which is a curve in the case of a continuous function. This graphical representation of the function is also called the \"graph of the function\".\n",
"Graphs are commonly used to encode structural information in many fields, including computer vision and pattern recognition, and graph matching is an important tool in these areas. In these areas it is commonly assumed that the comparison is between the \"data graph\" and the \"model graph\".\n",
"The machine can receive instructions which change the layout of the graph. The basic instructions are the new \"w instruction, which creates a new node which is the \"result\" of following the string \"w\", and the set \"w\" to \"v instruction which (re)directs an edge to a different node. Here \"w\" and \"v\" represent \"words\". \"v\" is a \"former\" word—i.e. a previously-created string of symbols—so that the redirected edge will point \"backwards\" to an old node that is the \"result\" of that string.\n"
] |
Why did the Constitution specify March 4 (the date) for the start of the new president's term? Why did FDR specify January 20 (the date) as the new date in the 20th amendment? | To answer the first part of your question:
The Constitution did **not** specify March 4, or any other date, as the beginning of the new President's term. It stated only that the length of the President's term was four years. And, while the Constitution gave Congress the power to set the date for the selection of Electors, and the date the Electors should cast their votes, it did *not* give Congress the power to set the date on which the President's term began.
Congress met for the first time on March 4th 1789. This date was the [result of a vote of the Continental Congress](_URL_0_):
> Resolved, That the first Wednesday in January next be the day for appointing electors in the several States, which before the said day shall have ratified the said Constitution; that the first Wednesday in February next be the day for the electors to assemble in their respective States and vote for a President; and that **the first Wednesday in March** next be the time, and the present seat of Congress [New York] the place for commencing, proceeding under the said Constitution."
[EDIT: So, to answer OP's specific question, it looks as if they were fond of Wednesdays, and March 4th happened to be a Wednesday in 1789].
Although Congress didn't count the electoral votes of the first Presidential election until April 6th of that year, and President Washington was not sworn in until April 30th, his term in office was retroactively considered to have begun on March 4th (since that was when the new Constitution "commenced").
Since every Presidential term was four years long, as specified by the Constituion, every subsequent Presidential term (until the XX Amendment was enacted) also began on March 4th.
| [
"Efforts to change these dates through a constitutional amendment began in the late 1920s. In March 1932, Congress approved a constitutional amendment moving the beginning and ending of the terms of the president and vice president from March 4 to January 20, and of members of Congress from March 4 to January 3. The amendment also specified procedures for cases in which the president-elect dies or otherwise fails to qualify. By January 23, 1933, the amendment had been ratified by the requisite number of states to become the Twentieth Amendment. Roosevelt's second inauguration in 1937 was the first presidential inauguration to take place on the new date.\n",
"The Twentieth Amendment (1933) changes the date on which a new President, Vice President and Congress take office, thus shortening the time between Election Day and the beginning of Presidential, Vice Presidential and Congressional terms. Originally, the Constitution provided that the annual meeting was to be on the first Monday in December unless otherwise provided by law. This meant that, when a new Congress was elected in November, it did not come into office until the following March, with a \"lame duck\" Congress convening in the interim. By moving the beginning of the president's new term from March 4 to January 20 (and in the case of Congress, to January 3), proponents hoped to put an end to lame duck sessions, while allowing for a speedier transition for the new administration and legislators.\n",
"BULLET::::- The United States Congress ratified the Twentieth Amendment to the United States Constitution, moving the presidential inauguration date up from March 4 to January 20 and eliminating lame-duck sessions of Congress.\n",
"Section 1 of the Twentieth Amendment prescribes January 20, at noon, as the start-finish date for the four-year term of both the President and Vice President. Previously March 4, the new date shortened the period between election day in November and Inauguration Day by about six weeks, accelerating the pace of the transfer of presidential power from the out-going president to his successor. By changing the date on which presidential terms end and begin, Section 1 has superseded the Twelfth Amendment's reference to March 4 as the date by which the House of Representatives must—under circumstances where no candidate won an absolute majority of votes for president in the Electoral College—conduct a contingent presidential election. Section 1 also specifies January 3, at noon, as the start-finish date for the terms of members of the Senate and the House of Representatives; the previous date had also been March 4.\n",
"The Constitution set the date for Congress to convene — Article 1, Section 4, Clause 2, originally set that date for the third day of December. The Twentieth Amendment, however, changed the opening date for sessions to noon on the third day of January, unless they shall by law appoint a different day. The Twentieth Amendment also states that Congress shall assemble at least once in every year and allows Congress to determine its convening and adjournment dates and other dates and schedules as it desires. Article 1, Section 3, provides that the president has the power to convene Congress on extraordinary occasions at his discretion.\n",
"BULLET::::- February 27, 1951: Twenty-second Amendment to the United States Constitution, setting a term limit for election and overall time of service to the office of President of the United States, was ratified by the requisite number of states (then 36) to become part of the Constitution\n",
"The Twentieth Amendment (Amendment XX) to the United States Constitution moved the beginning and ending of the terms of the president and vice president from March 4 to January 20, and of members of Congress from March 4 to January 3. It also has provisions that determine what is to be done when there is no president-elect. The Twentieth Amendment was adopted on January 23, 1933.\n"
] |
what happened at the nevada democratic convention last night? | There are many videos of what is apparently misconduct in the voting process aimed at benefitting Hillary Clinton and suppressing the supporters of Bernie Sanders. | [
"The Nevada caucuses are an electoral event in which citizens of the U.S. state of Nevada meet in precinct caucuses to elect delegates to the corresponding county conventions. There are 17 counties in Nevada and so there are 17 conventions. The county conventions then select delegates to Nevada's State Convention, which then choose delegates for the presidential nominating conventions.\n",
"The Nevada Democratic Party partnered with the U.S. Hispanic Chamber of Commerce and IMPACTO, 100 Black Men of America, and the College of Southern Nevada to hold the second Democratic presidential debate in Las Vegas. The debate was telecast live by MSNBC and held at the Cashman Center in Las Vegas on Tuesday, January 15, 2008 from 6:00 – 8:00 pm Pacific Standard Time.\n",
"The state convention was held in May as the final stage of the delegate selection process. Supports of Senator Sanders were angered when Party officials declined to accept the credentials of close to 60 pro-Sanders delegates. Nevada Democratic Party Chairwoman, Roberta Lange, allegedly received numerous death threats and threats to the lives of her family and grandchildren; a criminal investigation has yet to confirm these claims or the identities of those allegedly involved. At the convention, Sanders supporters protested until the staff cancelled the event. The event was later criticized as being violent, although there is no evidence that violence occurred.\n",
"The Nevada congressional elections of 2006 took place on November 7, 2006 when each of the state's three congressional districts elected a representative to the United States House of Representatives. Although President George W. Bush captured the state in both the 2000 and 2004 elections, he did so with a very slim margin (3.35% in 2000 and just 2.59% in 2004). Nevada was considered a battleground state due to the close victory margins.\n",
"The 2014 United States House of Representatives elections in Nevada were held on Tuesday, November 4, 2014 to elect the four U.S. Representatives from the state of Nevada, one from each of the state's four congressional districts. The elections coincided with the elections of other federal and state offices, including a gubernatorial election.\n",
"At the Nevada Democratic State Convention in May, Sanders delegates were outraged by changes to and interpretations of rules that resulted in denial of the credentials of almost 60 Sanders backers, with the result that Sanders, instead of edging Clinton out in delegates to the national convention, came in second. Angry Sanders backers shouted down keynote speaker Barbara Boxer, a Clinton supporter. It was widely reported that some shoving, and throwing of chairs and other objects, ensued before Nevada Democratic Party Chairwoman Roberta Lange ended the convention early, but no actual evidence of chair-throwing ever emerged. After the convention was adjourned, casino security guards and local police were called to remove Sanders supporters who refused to leave the casino ballroom. Lange received death threats to herself and her family online and by telephone after \"Sanders supporters posted Lange's home and business addresses, email and cell phone number online.\" Sanders spokesman Michael Briggs said, \"We do not condone violence or encourage violence or even threats of violence\", and denied that the campaign had a role \"in encouraging the activity that the party is complaining about.\"\n",
"The 2012 Democratic National Convention was a gathering, held from September 4 to September 6, 2012, at the Time Warner Cable Arena in Charlotte, North Carolina, in which delegates of the Democratic Party chose the party's nominees for President and Vice President in the 2012 United States national election.\n"
] |
what makes even "healthy" or "normal" people sad from time-to-time for no reason at all (it seems like)? | Every now and then I remember how pointless and insignificant everyone's lives are. | [
"Research has found that the onset of SAD typically occurs between the ages of 20–30 years, but most affected people do not seek medical help. This could be due to the stigma of mental health issues. Many are afraid to state they are suffering and would rather hide it. As a society, we should push forward towards greater acceptance and gain knowledge in order to solve these issues.\n",
"SAD may cause significant negative effects within areas of social and emotional functioning, family life, and physical health of the disordered individual. The duration of this problem must persist for at least four weeks and must present itself before a child is eighteen years of age to be diagnosed as SAD in children, but can now be diagnosed in adults with a duration typically lasting six months in adults as specified by the DSM-5.\n",
"Just how SAD affects a child's attendance and participation in school, their avoidance behaviors stay with them as they grow and enter adulthood. Recently, \"the effects of mental illness on workplace productivity have become a prominent concern on both the national and international fronts\". In general, mental illness is a common health problem among working adults, 20% to 30% of adults will suffer from at least one psychiatric disorder. Mental illness is linked to decreased productivity, and with individuals diagnosed with SAD their levels at which they function decreases dramatically resulting in partial work-days, increase in number of total absences, and \"holding back\" when it comes to carrying out and completing tasks.\n",
"SAD shows a high degree of co-occurrence with other psychiatric disorders. In fact, a population-based study found that 66% of those with SAD had one or more additional mental health disorders. SAD often occurs alongside low self-esteem and most commonly clinical depression, perhaps due to a lack of personal relationships and long periods of isolation related to social avoidance. Clinical depression is 1.49 to 3.5 times more likely to occur in those with SAD. Anxiety disorders other than SAD are also very common in patients with SAD, in particular generalized anxiety disorder. Avoidant personality disorder is likewise highly correlated with SAD, with comorbidity rates ranging from 25% to 89%.\n",
"One study looked at whether some people could be predisposed to SAD based on personality traits. Correlations between certain personality traits, higher levels of neuroticism, agreeableness, openness, and an avoidance-oriented coping style, appeared to be common in those with SAD.\n",
"A wide range of research has linked sad or depressed moods with more extensive and accurate evaluation of problems. As a result of this, earlier studies hypothesized that people with more depressed moods would tend to use anchoring less than those with happier moods. However, more recent studies have shown the opposite effect: sad people are \"more\" likely to use anchoring than people with happy or neutral mood.\n",
"As noted by Altman, McGoey & Sommer, it is important to observe the child, \"in multiple contexts, on numerous occasions, and in their everyday environments (home, daycare, preschool)\". It is beneficial to view parent and child interactions and behaviors that may contribute to SAD.\n"
] |
How did showering to clean one's body become a thing? | William Feetham patented a chain-release shower in 1767. In the late 1800s communal showers took hold by French military, under the direction of physician François Merry Delabost who had first tried them out on prisoners for reasons of economics and hygiene.
In modern times showers did not start to become common until the early 1920s, by which time homes had water heating and reliable plumbing, and had shower heads in existing tubs. But it was slow going at first. A 1954 article in Challenge magazine noted, "the plumbing industry confidently predicts that the day is not far off when a bathroom and bathtub (with shower) will become a necessary adjunct to every bedroom in the home." (Challenge Vol. 2, No. 6 (March 1954), pp. 36-38).
| [
"Showering is mostly part of a daily routine primarily to promote cleanliness and prevent odor, disease and infection. Advances in science and medicine in the 19th century began to realize the benefit of regular bathing to an individual's health. As a result, most modern cultures encourage a daily personal hygiene regimen. Showering has also developed the reputation as a relaxing and generally therapeutic activity.\n",
"Removal of soap and water from the clothing after washing was a separate process. First, soap would be rinsed out with clear water. After rinsing, the soaking wet clothing would be formed into a roll and twisted by hand to extract water. The entire process often occupied an entire day of hard work, plus drying and ironing.\n",
"Hair washing is the cosmetic act of keeping hair clean by washing it. To remove sebum from hair, some apply a surfactant, usually shampoo (sometimes soap) to their hair and lather the surfactant with water. The surfactant is rinsed out with water along with the dirt that it bonds to.\n",
"Laundry refers to the act of washing clothing and linens, the place where that washing is done, and/or that which needs to be, is being, or has been laundered. Various chemicals may be used to increase the solvent power of water, such as the compounds in soaproot or yucca-root used by Native American tribes. Soap, a compound made from lye (from wood-ash) and fat, is an ancient and very common laundry aid. Modern washing machines typically use powdered or liquid laundry detergent in place of more traditional soap. Once clean, the clothes have been wrung out — twisted to remove most of the water. Then they were hung up on poles or clotheslines to air dry, or sometimes just spread out on clean grass.\n",
"Shower gel (also shower cream or body wash) is a specialized liquid product used for cleaning the body during showers. Not to be confused with liquid soaps, shower gels, in fact, do not contain saponified oil. Instead, it uses synthetic detergents derived from either petroleum or plant sources.\n",
"Washing hair removes excess sweat and oil, as well as unwanted products from the hair and scalp. Often hair is washed as part of a shower or bathing with shampoo, a specialized surfactant. Shampoos work by applying water and shampoo to the hair. The shampoo breaks the surface tension of the water, allowing the hair to become soaked. This is known as the wetting action. The wetting action is caused by the head of the shampoo molecule attracting the water to the hair shaft. Conversely, the tail of the shampoo molecule is attracted to the grease, dirt and oil on the hair shaft. The physical action of shampooing makes the grease and dirt become an emulsion that is then rinsed away with the water. This is known as the emulsifying action. Sulfate free shampoos are less harming on color treated hair than normal shampoos that contain sulfates. Sulfates strip away natural oils as well as hair dye. Sulfates are also responsible for the foaming effect of shampoos.\n",
"Bathing roughly follows ancient Roman bathing practices. It starts with relaxation in a room heated by a continuous flow of hot, dry air, allowing the bather to perspire freely. Bathers may then move to an even hotter room before they wash in cold water. After performing a full body wash and receiving a massage, bathers finally retire to the cooling-room for a period of relaxation.\n"
] |
Could DNA fossilize? | Unfortunately probably not. A relatively recent study pegged the half life of DNA at around 500 years depending on the environmental surroundings. So every 500 years roughly half of the remaining bonds in the DNA molecule will be broken. After 2000 years, you would only expect 1/16 of the bonds to be remaining. And it's all downhill from there. Recently extinct animals could possibly have their DNA sequenced (and in fact the wooly mammoth has been mostly sequenced) but they would be much less likely to be fossilized. So we probably aren't getting DNA from fossils.
Also, we don't use microscopes to read the DNA sequence. We use DNA sequencing, which I can explain in more detail if you're interested in that. | [
"Researchers in 2016 measured chloroplast DNA in marine sediment cores, and found diatom DNA dating back to 1.4 million years. This DNA had a half-life significantly longer than previous research, of up to 15,000 years. Kirkpatrick's team also found that DNA only decayed along a half-life rate until about 100 thousand years, at which point it followed a slower, power-law decay rate.\n",
"In 1994, Woodward announced to have extracted and typed DNA from an 80-million-year-old Cretaceous dinosaur bone, but S. Blair Hedges and other ancient DNA experts demonstrated that Woodward had really sequenced human DNA.\n",
"A critical review of ancient DNA literature through the development of the field highlights that few studies after about 2002 have succeeded in amplifying DNA from remains older than several hundred thousand years. A greater appreciation for the risks of environmental contamination and studies on the chemical stability of DNA have resulted in concerns being raised over previously reported results. The dinosaur DNA was later revealed to be human Y-chromosome, while the DNA reported from encapsulated halobacteria has been criticized based on its similarity to modern bacteria, which hints at contamination. A 2007 study also suggests that these bacterial DNA samples may not have survived from ancient times, but may instead be the product of long-term, low-level metabolic activity.\n",
"The first fossil fragments were found in 1993 by David W. Krause of New York's Stony Brook University, but it took 14 years for scientists Susan E. Evans, Marc E. H. Jones, and Krause to assemble enough data for publication in the \"Proceedings of the National Academy of Sciences,\" the journal of the United States National Academy of Sciences.\n",
"BULLET::::- Scientists report the results of the oldest human DNA found. The DNA is from a 400,000-year-old hominin femur bone fossil uncovered in Spain and matches the DNA of extinct human Denisovans that lived thousands of miles away in Siberia.\n",
"Evidence for the extraction of short segments of ancient DNA from dinosaur fossils has been reported on two separate occasions. The extraction of protein, soft tissue, remnant cells and organelle-like structures from dinosaur fossils has been confirmed. Blood-derived porphyrin proteins have also been discovered in a mid Eocene mosquito fossil.\n",
"The identity of the fossil remain can be uncovered by comparing its DNA sequence with those of known species using software such as BLASTN. This archaeogenetic approach is especially helpful when the morphology of the fossil is ambiguous. Apart from that, species identification can also be done by finding specific genetic markers in an aDNA sequence. For example, the American indigenous population is characterized by specific mitochondrial RFLPs and deletions defined by Wallace et al.\n"
] |
Would a single candle in an otherwise unlit circus Hall of Mirrors provide the same lighting effect as an equivalent number of real candles (equivalent to the number of reflections) in a normal room? | Think of it this way. For every mirror there is an area NOT lit because light headed for that area was redirected by the mirror, at a loss because the mirror is not 100% efficient.
That's where the seemingly "extra" light comes from. | [
"The illumination problem is a resolved mathematical problem attributed to Ernst Straus in the 1950s. Straus asked if a room with mirrored walls can always be illuminated by a single point light source, allowing for repeated reflection of light off the mirrored walls. Alternatively, the question can be stated as asking that if a billiard table can be constructed in any required shape, is there a shape possible such that there is a point where it is impossible to the billiard ball in a at another point, assuming the ball is point-like and continues infinitely rather than stopping due to friction.\n",
"In both of these works the candlelit setting had a realist justification. Viewing sculpture by candlelight, when the contours showed well and there might even be an impression of movement from the flickering light, was a fashionable practice described by Goethe. In the orrery demonstration the shadows cast by the lamp representing the sun were an essential part of the display, used to demonstrate eclipses. But there seems no reason other than heightened drama to stage the air pump experiment in a room lit by a single candle, and in two later paintings of the subject by Charles-Amédée-Philippe van Loo the lighting is normal.\n",
"Thus one foot-candle is equal to one lumen per square foot or approximately 10.764 lux. In practical applications, as when measuring room illumination, it is very difficult to measure illuminance more accurately than ±10%, and for many purposes it is quite sufficient to think of one foot-candle as about ten lux as is typically done in the lighting industry.\n",
"In both of these works, the candlelit setting had a realist justification. Viewing sculpture by candlelight, when the contours showed well, and there might even be an impression of movement from the flickering light, was a fashionable practice described by Goethe. In the orrery demonstration the shadows cast by the lamp representing the Sun were an essential part of the display. But there seems no reason other than heightened drama to stage the air pump experiment in a room lit by a single candle, and in two later paintings of the subject by Charles-Amédée-Philippe van Loo the lighting is normal.\n",
"He described a 'dark chamber' and did a number of trials of experiments with small pinholes and light passing through them. This experiment consisted of three candles in a row and seeing the effects on the wall after placing a cutout between the candles and the wall. \n",
"Peep shows were further developed with translucent painting techniques, perforations and cut-out shapes that provided special effects when lit from behind by candles. Changing the light from the front to the back of the picture could change the scene from day to night, much like the dissolving views that would later become a popular type of magic lantern show.\n",
"Techniques to add motion to painted glass slides for the magic lantern were described since circa 1700. These usually involved parts (for instance limbs) painted on one or more extra pieces of glass moved by hand or small mechanisms across a stationary slide which showed the rest of the picture. Popular subjects for mechanical slides included the sails of a windmill turning, a procession of figures, a drinking man lowering and raising his glass to his mouth, a head with moving eyes, a nose growing very long, rats jumping in the mouth of a sleeping man. A more complex 19th century rackwork slide showed the then known eight planets and their satellites orbiting around the sun. Two layers of painted waves on glass could create a convincing illusion of a calm sea turning into a very stormy sea tossing some boats about by increasing the speed of the manipulation of the different parts.\n"
] |
the weekend | From a Euro-American perspective, the Sabbath has been around since Biblical times, so the idea of having one day per week to take a break is ancient.
I believe that current 5-day work week started around the later Industrial revolution, when more people began paying attention to things like worker welfare (no more children playing around with heavy machinery), as well as starting to introduce a shorter workday (eventually ending in the 9-5 workday we have now)
Hard to say what the sole effect of making a five week day was since it was a change accompanied by shorter workdays and better labor regulation.
Wiki: _URL_0_ | [
"The weekend is that period of the week set aside by custom or law for rest from labor. In many countries it is Saturday and Sunday and often includes Friday night. This five-day workweek arose in America when labor unions attempted to accommodate Jewish Sabbath, beginning at a New England cotton mill and also instituted by Henry Ford in 1926; it became standard in America by about 1940 and spread among English-speaking and European countries to become the international workweek. China adopted it in 1995 and Hong Kong by 2006. India and some other countries follow both the international workweek and a more traditional Saturday half-workday and Sunday weekend. While Indonesia and Lebanon have the international workweek, most Muslim countries count Friday as the weekend, alone or with Thursday (all or half) or Saturday. Some universities permit a three-day weekend from Friday to Sunday. The weekend in Israel, Nepal, and parts of Malaysia, is Friday (all or half) and Saturday. Only the one-day customary or legal weekends are usually called \"Sabbath\".\n",
"The Weekenders is an American animated television series created by Doug Langdale. It centers on the weekend life of four seventh graders: Tino, Lor, Carver, and Tish. The series initially aired on ABC and UPN, but was later moved to Toon Disney.\n",
"Weekend activities are many and varied. Saturday evening events include trips to dinner or the movies, on-campus movies, and dances, while on Sundays there are irregular shopping trips to town; trips to major ski areas, to Boston, and to concerts and sports events at Dartmouth; and outdoor activities such as apple-picking and hiking.\n",
"\"The Weekend\" is a song characterized by a soft, slow-burning melody that runs throughout its four minutes and thirty-two seconds. Its sultry production draws from contemporary R&B and 1990s neo soul music genres. Built around a synth-line, the song is completed with finger-snaps, key thumps that resemble the sound of a ticking clock, hi-hats and a high-pitched vocal sample. Lyrically, \"The Weekend\" is about polyamory. SZA sings about sharing her romantic partner with other women; she finds herself in the perspective of a woman who only sees her partner at weekends while others have him during the week. Some online publications called the song's narrator a \"side chick\", but according to SZA, \"The Weekend\" is about sharing a man with two other women at the same time. She sings in the hook, \"My man is my man is your man / Heard it's her man too\". For her, this song is about feeling empowered in a situation in which the narrator's lover tries to play her. In interview with Vulture.com she said:\n",
"Weekend is an American television newsmagazine program that aired on NBC from 1974 to 1979. It originally aired once monthly on Saturday nights from 11:30 p.m. to 1 a.m. Eastern time, the same time slot as Saturday repeats of \"The Tonight Show Starring Johnny Carson\" during its first season, then to replace \"Saturday Night Live\", once a month on those weekends when the \"SNL\" cast was not producing a show. The program was awarded a George Foster Peabody medal in 1975 and attracted a cult following.\n",
"\"Weekender\" is a 1992 single by the band Flowered Up. The band had performed the song as early as 1991. The song has been described as denouncing people who only go to clubs on the weekend and advocating a party-all-the-time philosophy of the group. The group originally wanted it to be released through their current label London Records. The single was turned down by the label and released later in April 1992 by Heavenly Recordings.\n",
"\"The Weekend\" is a song recorded by American singer SZA for her debut studio album, \"Ctrl\" (2017). Written by SZA and its producer ThankGod4Cody, the song samples \"Set the Mood (Prelude)\" from the 2006 album \"FutureSex/LoveSounds\", written by Justin Timberlake, Timbaland, and Danja, who also received writing credits for \"The Weekend\". A contemporary R&B and neo soul record, \"The Weekend\" uses a synth-line, hi-hats, drums, a high-pitched vocal sample and clocking key thumps. Its theme is polyamory; SZA sings about sharing a lover with other women from the perspective of one who only see her partner at weekends.\n"
] |
Hitler glorified blonde hair and blue eyes, yet he himself didn't look stereotypically "Aryan". Did he consider himself and the other Austrians to be "lower quality Aryans" and the Scandinavians "higher quality Aryans"? I.e did he consider himself "pure"? | Hitler discussed this in Mein Kampf.
He promoted the idea of five sub-races of the Aryan people. Dinaric, Alpine, mediterranean, Nordic, and Eastern Baltic. The best kind of Aryan is, you probably guessed it, are the predominantly blue eyed and fair headed Nordics.
This was actually very popular, Nordicism I mean, way before Hitler promoted it. Anyway, Hitler said that Germans and other kinds of Aryans have either been diluted and weakened over time (mixing with Jewish people for example).
He promoted blue eyed and blonde germans as models because they are less not Nordic. Essentially, Germans needed to expunge non-Nordic lineage which will cause them to have blue eyes and blonde hair again.
The issue with Nordicism conflicted with Italy which promoted Mediterreneanism. | [
"The Nazis considered the purest Aryans to be those that belonged to the \"Nordic race\" physical ideal, known as the \"master race\" during Nazi Germany. Although the physical ideal of the Nazi racial theorists was typically the tall, fair-haired and light-eyed Nordic individual, such theorists accepted the fact that a considerable variety of hair and eye colour existed within the racial categories they recognised. For example, Adolf Hitler and many Nazi officials had dark hair and were still considered members of the Aryan race under Nazi racial doctrine, because the determination of an individual's racial type depended on a preponderance of many characteristics in an individual rather than on just one defining feature.\n",
"\"When I indicated my disbelief in their racial theories, they said what other Nazis had said: 'But surely you, a perfect type of Aryan, could not be unsympathetic to our views'... I had the impression that they really do set unbelievable store by such physical characteristics as long heads and light hair.\"\n",
"The feeling that Germans were the Aryan \"Herrenvolk\" (Aryan master race) was widely spread among the German public through Nazi propaganda and among Nazi officials throughout the ranks, in particular when Reichskommissariat Ukraine Erich Koch said:\n",
"Although the physical ideal of these racial theorists was typically the tall, fair-haired and light-eyed Nordic individual, such theorists accepted the fact that a considerable variety of hair and eye colour existed within the racial categories they recognised. For example, Adolf Hitler and many Nazi officials had dark hair and were still considered members of the Aryan race under Nazi racial doctrine, because the determination of an individual's racial type depended on a preponderance of many characteristics in an individual rather than on just one defining feature.\n",
"Hitler made references to an \"Aryan Race\" founding a superior type of humanity. The purest stock of Aryans according to Nazi ideology was the Nordic people of Germany, England, Denmark, The Netherlands, Sweden and Norway. The Nazis defined Nordics as being identified by tall stature (average 175 cm), long faces, prominent chins, narrow and straight noses with a low bridge, lean builds, doliocephalic skulls, straight light hair, light eyes, and fair skin. The Nazis claimed that Germanic people specifically represented a southern branch of the Aryan-Nordic population. The Nazis did not consider all Germans to be of the Nordic type (which predominated the north), and stated that Germany also had a large \"Alpine\" population (identified by, among other features, lower stature, stocky builds, flatter noses, and higher incidences of darker hair and eyes). Hitler and Nazi racial theorist Hans F. K. Günther framed this as an issue to be corrected through selective breeding for \"Nordic\" traits. Hitler Youth propaganda emphasized the \"Nordic\" nature of Germans, with the text issued to all Hitler Youth members stating: \"the principal ingredient of our people is the Nordic race (55%). That is not to say that half our people are pure Nordics. All of the aforementioned races appear in mixtures in all parts of our fatherland. The circumstance, however, that the great part of our people is of Nordic descent justifies us taking a Nordic standpoint when evaluating our character and spirit, bodily structure, and physical beauty.\"\n",
"These and other ideas evolved into the Nazi use of the term \"Aryan race\" to refer to what they saw as being a superior race, which was narrowly defined by the Nazis as being identical with the Nordic race, followed by other sub-races of the Aryan race and excluding Slavs as non-Aryan. They worked to maintain the purity of this race through eugenics programs (including anti-miscegenation legislation, compulsory sterilization of the mentally ill and the mentally deficient, the execution of the institutionalized mentally ill as part of a euthanasia program).\n",
"Gobineau later came to use and reserve the term Aryan only for the \"German race\" and described the Aryans as 'la race germanique'. By doing so, he presented a racist theory in which Aryans—that is Germans—were all that was positive.\n"
] |
what's the purpose for the mid season finale pretty much all shows have now? | Lets everybody enjoy their holidays without watching TV and having to keep up while with family and gives more time to film and edit episodes
| [
"The finale was written by co-creator/executive producer Damon Lindelof and executive producer Carlton Cuse, and directed by executive producer Jack Bender. Unlike the previous season finales, which were two hours long with advertisements, the series finale was expanded by half an hour, running two and a half hours starting at 9 pm ET, with a retrospective of the past six seasons running for two hours, starting at 7 pm.\n",
"After the series' normal run began in January 2008, the first two seasons were aired nearly back-to-back, creating nearly a year-long delay in between the second and third seasons. The long-awaited final season finally premiered in North America on March 14, 2009, with a 90-minute (three episode) special. After a lack of communication and much speculation, it was officially announced at BotCon 2009 that the series was over, at least in a televised format.\n",
"As broadcast of the fourth season finale approached, there was a flurry of news reports suggesting that the series was coming to an unexpected end, based upon televised promotions for the episode, leaked plot details, and wording of a CTV press release issued on March 6, 2007, that implied that the series finale would air on March 12, 2007. Two segments of production footage with time code circulated on YouTube also seemed to indicate a series finale as imminent despite the show's continued success in Canada and recent U.S. sale. On March 7, 2007, CTV clarified its press release, stating it was a season finale, and on March 13, 2007, CTV confirmed an order for a 19-episode fifth season, that premiered on September 24, 2007.\n",
"The series was cancelled on May 14, 2010. However, the promo that aired on May 20, 2010 stated that this was the season finale. The finale was originally set to be two hours long, consisting of both this episode and \"Countdown\". After cancellation, they were aired separately. John Polson directed this episode, his third directing credit for the season. Timothy J. Lea and Scott M. Gimple wrote the episode. This is Lea's second writing credit for the show. He wrote the episode \"Queen Sacrifice\" with Byron Balasco.\n",
"A season finale (British English: last in the series; Australian English: season final) is the final episode of a season of a television program. This is often the final episode to be produced for a few months or longer, and, as such, will try to attract viewers to continue watching when the series begins again.\n",
"BULLET::::- The show was conceived as an eight-week contest, but due to lower-than-expected ratings, an announcement in Episode 3 declared that subsequent episodes would have double eliminations, reducing the total number of broadcast shows to six. The Finale was moved from Las Vegas, Nevada to Los Angeles.\n",
"The show consists of 26 episodes which aired at prime time 9:30pm (local time) every Wednesdays. The season finale aired on 29 March 2017. Due to higher viewership demand and the popularity of the show ITN, officially announced their interest in renewing for the second season of the show.\n"
] |
why are animals and plants so distinct, e.g why aren't there any plants that can walk or animals that do photosynthesis? | There are animals like a sponge that you would likely mistake for a plant if you didn't know better, and plants that can move and eat "meat" like a venus fly trap. I know that plants and animals are different in that plants have cell walls and animals have cell membranes, and given how far back on the tree of life we are related, those two things must be really different and important. | [
"Plants are often the dominant physical and structural component of habitats where they occur. Many of the Earth's biomes are named for the type of vegetation because plants are the dominant organisms in those biomes, such as grasslands, taiga and tropical rainforest.\n",
"Plants, like all known organisms, use DNA to pass on their traits. Animal genetics often focuses on parentage and lineage, but this can sometimes be difficult in plant genetics due to the fact that plants can, unlike most animals, be self-fertile. Speciation can be easier in many plants due to unique genetic abilities, such as being well adapted to polyploidy. Plants are unique in that they are able to produce energy-dense carbohydrates via photosynthesis, a process which is achieved by use of Chloroplast|chloroplasts]]. Chloroplasts, like the superficially similar mitochondria, possess their own DNA. Chloroplasts thus provide an additional reservoir for genes and genetic diversity, and an extra layer of genetic complexity not found in animals.\n",
"The study of plants and vegetation is complicated by their form. First, most plants are rooted in the soil, which makes it difficult to observe and measure nutrient uptake and species interactions. Second, plants often reproduce vegetatively, that is asexually, in a way that makes it difficult to distinguish individual plants. Indeed, the very concept of an individual is doubtful, since even a tree may be regarded as a large collection of linked meristems. Hence, plant ecology and animal ecology have different styles of approach to problems that involve processes like reproduction, dispersal and mutualism. Some plant ecologists have placed considerable emphasis upon trying to treat plant populations as if they were animal populations, focusing on population ecology. Many other ecologists believe that while it is useful to draw upon population ecology to solve certain scientific problems, plants demand that ecologists work with multiple perspectives, appropriate to the problem, the scale and the situation.\n",
"Because the biology of plants differs with animals, their symptoms and responses are quite different. In some cases, a plant can simply shed infected leaves or flowers to prevent the spread of disease, in a process called abscission. Most animals do not have this option as a means of controlling disease. Plant diseases organisms themselves also differ from those causing disease in animals because plants cannot usually spread infection through casual physical contact. Plant pathogens tend to spread via spores or are carried by animal vectors.\n",
"Unlike animals, many plant cells, particularly those of the parenchyma, do not terminally differentiate, remaining totipotent with the ability to give rise to a new individual plant. Exceptions include highly lignified cells, the sclerenchyma and xylem which are dead at maturity, and the phloem sieve tubes which lack nuclei. While plants use many of the same epigenetic mechanisms as animals, such as chromatin remodelling, an alternative hypothesis is that plants set their gene expression patterns using positional information from the environment and surrounding cells to determine their developmental fate.\n",
"The study of plants is vital because they underpin almost all animal life on Earth by generating a large proportion of the oxygen and food that provide humans and other organisms with aerobic respiration with the chemical energy they need to exist. Plants, algae and cyanobacteria are the major groups of organisms that carry out photosynthesis, a process that uses the energy of sunlight to convert water and carbon dioxide into sugars that can be used both as a source of chemical energy and of organic molecules that are used in the structural components of cells. As a by-product of photosynthesis, plants release oxygen into the atmosphere, a gas that is required by nearly all living things to carry out cellular respiration. In addition, they are influential in the global carbon and water cycles and plant roots bind and stabilise soils, preventing soil erosion. Plants are crucial to the future of human society as they provide food, oxygen, medicine, and products for people, as well as creating and preserving soil.\n",
"Plants exhibit natural variation in their form and structure. While all organisms vary from individual to individual, plants exhibit an additional type of variation. Within a single individual, parts are repeated which may differ in form and structure from other similar parts. This variation is most easily seen in the leaves of a plant, though other organs such as stems and flowers may show similar variation. There are three primary causes of this variation: positional effects, environmental effects, and juvenility.\n"
] |
what is the election everyone in america is talking about and what could it change in the american political system (i'm not american) | Every two years, the entire House of Representatives and 1/3 of the Senate are up for election. This gives the possibility to flip the majority party in both chambers of the federal legislature, making it more difficult to pass legislation preferred by the Republican party. (But not enough to give a veto-proof Democratic majority in both chambers). [This is a drastic oversimplification making the assumption a lot of proposed legislation is sharpy decided along party lines]
In addition, as usual, many state/local elections are held simultaneously | [
"America Votes is a 501(c)4 organization that aims \"to coordinate and promote progressive issues.\" America Votes leads national and state-based coalitions to advance progressive policies and increase voter turnout for Democratic Party candidates.\n",
"Americans Elect was a political organization in the United States known primarily for its efforts to stage a national online primary for the 2012 US Presidential Election. Although it was successful in obtaining signatures to get on the ballot in a majority of states, the process set up by the organization did not select a candidate.\n",
"Americans Elect, a coalition of American centrists funded by wealthy donors such as business magnate Michael Bloomberg, former junk-bond trader Peter Ackerman and hedge fund manager John H. Burbank III, launched an effort in mid-2011 to create a national \"virtual primary\" that would challenge the current two-party system. The group aims to nominate a presidential ticket of centrists with names that would be on ballots in all 50 states. The group banks on broad cultural dissatisfaction with the partisan gridlock in Washington, D.C. \"The Christian Science Monitor\" has stated that \"the political climate couldn't be riper for a serious third-party alternative\" such as their effort, but the \"hurdles Americans Elect faces are daunting\" to get on ballots.\n",
"Americans Elect was formed by many of the individuals who were responsible for a previous attempt to nominate an Internet candidate, Unity08, and had substantially identical goals for the 2012 presidential election cycle. Americans Elect's founder and Chairman was financier Peter Ackerman. Kahlil Byrd was the former CEO; he subsequently become the president of StudentsFirst by January 2013. Other members of the Board of Directors included Eliot Cutler, Dennis Blair, Stephen W. Bosworth, Irvine Hockaday, and Christine Todd Whitman and Joshua S. Levine.\n",
"At election time it is just political suicide to try to defend the United States... I think on the whole people in the other American Republics understand and support us, but it isn't good politics to say so at election time. We are a sort of punching bag during elections. Everybody likes to take a swing at us, and makes sure he does every time you say something.\n",
"The United States is unusual in that dozens of different offices are filled by election, from drain commissioner to the President of the United States. Elections happen every year on many different dates in many different areas of the country.\n",
"On other occasions, in other years, this country has elected Republican Presidents and Democratic Presidents. They do it when they make a decision that that party and that candidate will serve a great national purpose. \"In my judgment and the responsibility ultimately is yours, in my judgment the United States will be best served by a candidate and a party who recognizes the basic issues of our time, and that is that this country has to go back to work again.\"\n"
] |
why is the nanking massacre so controversial among the chinese and japanese? which is correct? | considering there are living witnesses to some of the atrocities, it's hard to deny atrocities happened.
the Japanese story says there was no high level orders. and whatever stories of individual soldiers committing actions must have been fabrications because honorable soldiers always follow orders.
just like flat earthers, no amount of evidence will ever convince them that their opinion is wrong. and once you're in deep, you're committed to go all the way.
| [
"Nanking Massacre denial is the denial that Imperial Japanese forces murdered hundreds of thousands of Chinese soldiers and civilians in the city of Nanjing during the Second Sino-Japanese War, a highly controversial episode in Sino-Japanese relations. Some historians accept the findings of the Tokyo tribunal with respect to the scope and nature of the atrocities committed by the Imperial Japanese Army after the Battle of Nanking, others do not. In Japan, however, there has been a debate over the extent and nature of the massacre. Relations between Japan and China have been complicated as a result, as denial of the massacre is seen in China as part of an overall unwillingness on Japan's part to admit and apologize for its aggression, or a perceived insensitivity regarding the killings. Estimates of the death toll vary widely, ranging from 40,000 to 200,000. Some scholars, notably the revisionists in Japan, have contended that the actual death toll is far lower, or even that the event was entirely fabricated and never occurred at all. These revisionist accounts of the killings have become a staple of Japanese nationalist discourse.\n",
"During the Nanking massacre which was committed during the early months of the Second Sino-Japanese War, the Japanese committed mass killings against the Chinese. Bradley Campbell described the Nanking Massacre as a genocide, because the Chinese were unilaterally killed by the Japanese en masse during the aftermath of the battle for the city, despite its successful and certain outcome.\n",
" The official stance of the People's Republic of China is that 300,000 or more Chinese were massacred in Nanking. Initially, this figure was generally accepted as including both massacre victims and Chinese soldiers killed in combat, though during the 1980s it came to be interpreted as including only massacre victims.\n",
"The PRC and Japan continue to debate over the actual number of people killed in the Rape of Nanking. The PRC claims that at least 300,000 civilians were murdered while Japan claims a far less figure of 40,000-200,000. While a majority of Japanese believe in the existence of the massacre, a Japanese-produced documentary film released just prior to the 60th anniversary of the massacre, titled \"The Truth about Nanjing\", denies that any such atrocities took place. These disputes have stirred up enmity against Japan from the global Chinese community, including Taiwan.\n",
"Massacre denialists such as Higashinakano argue that the \"Nanking Massacre\" was a fabrication and war-time propaganda spread by the Chinese Nationalists and Communists. He argues that the activities of the Japanese military in Nanking were in accordance with international law and were humane. Among other claims, he has denied that there was execution of POWs in uniform, and cited anecdotes claiming that Chinese POWs were treated humanely by Japanese soldiers. However, Higashinakano has also claimed at times that the executed POWs were illegitimate combatants, and so their execution was legitimate under international law. Higashinakano believes some several thousand 'illegitimate combatants' may have been executed in such a fashion.\n",
"The first academic accounts of the Nanking Massacre included as massacre victims all Chinese who were killed by the Japanese Army in and around Nanking, including Chinese soldiers who were killed in action. This definition was supported by Hora and other early scholars. In 1986 Ikuhiko Hata became the first historian to call this definition into question. Hata argued that Chinese troops killed on the battlefield were part of the Battle of Nanking rather than Nanking Massacre, and that only civilians and disarmed POWs should be counted as massacre victims.\n",
"On June 19, 2007, a group of around 100 Liberal Democratic Party (LDP) lawmakers again denounced the Nanjing Massacre as a fabrication, arguing that there was no evidence to prove the allegations of mass killings by Japanese soldiers. They accused Beijing of using the alleged incident as a \"political advertisement\".\n"
] |
why auto insurance companies allowed to discriminate? | It's not a denial of service or something like preferential treatment for a certain race, gender, etc. Actuarial science is just that: a science. Insurance is a business, and the different variables that determine how much someone pays for their insurance are based on past and present statistics of behavior. The price isn't set for me just because I'm a non-married white male with no dependents and so on, it's because all of those factors statistically show that I am a higher risk for an insurance claim. There is chemistry in the human brain involved as well that helps explain why the 18-25 partition has an upper bound of 25. There are subgroups within that partition as well.
If there was a flat rate insurance cost for everyone who owned a car, regardless of age, gender, driving history, etc, there would be a massive outcry from the 'safer' drivers who then pay more than their share for the claims of the young and old. | [
"Proponents of no-fault insurance argue that automobile collisions are inevitable and that at-fault drivers are not necessarily higher risk and should not necessarily be punished; moreover, they note that the presence of liability insurance insulates reckless or negligent drivers from financial disincentives of litigation; also, uninsured motorists are often \"judgment proof\" (i.e., can't and won't end up paying for their liability anyway), so that in regions with high numbers of such uninsured motorists, no-fault systems may make more sense. Furthermore, traditional insurance is regressive because drivers of inexpensive cars are liable for damage to any car, no matter its value, even though they only add a small amount of liability to the pool with their less valuable cars. This issue is fixed under a no-fault regime.\n",
"Individual auto insurance policies do not cover commercial activities, which may result in denials of claims if drivers are working for hire. To prevent legal complications, some ride service providers are requiring their drivers to purchase commercial insurance. Legislation for micro job worker issues remains unclear and unresolved.\n",
"It is illegal for California insurers to refuse to provide car insurance to properly licensed drivers solely because they have a disability. It is also illegal for them to refuse to provide car insurance \"on the basis that the owner of the motor vehicle to be insured is blind,\" but they are allowed to exclude coverage for injuries and damages incurred while a blind unlicensed owner is actually operating the vehicle (the law is apparently structured to allow blind people to buy and insure cars which their friends, family, and caretakers can drive for them).\n",
"The Insurance Information and Enforcement System is a system used, in the United States, by many Department of Motor Vehicles agencies to track people who might be driving without automobile insurance. Since many jurisdictions forbid uninsured driving, a system like this is necessary to keep track of any applications and cancellations of policies. The system was created largely because many people try to trick the DMV into thinking they're keeping their car insured by registering a car with a policy and then cancelling the policy soon after to keep the plates.\n",
"Vehicle insurance, in the United States and elsewhere, is designed to cover risk of financial liability or the loss of a motor vehicle the owner may face if their vehicle is involved in a collision resulting in property or physical damages. Most states require a motor vehicle owner to carry some minimum level of liability insurance. States that do not require the vehicle owner to carry car insurance include Virginia, where an uninsured motor vehicle fee may be paid to the state; New Hampshire, and Mississippi which offers vehicle owners the option to post cash bonds (see below). The privileges and immunities clause of Article IV of the U.S. Constitution protects the rights of citizens in each respective state when traveling to another. A motor vehicle owner typically pays insurers a monthly fee, often called an insurance premium. The insurance premium a motor vehicle owner pays is usually determined by a variety of factors including the type of covered vehicle, the age and gender of any covered drivers, their driving history, and the location where the vehicle is primarily driven and stored. Credit scores are also taken into consideration. Most insurance companies offer premium discounts based on these factors.\n",
"Automotive insurance consumers and other examples: The US states of New Jersey and Pennsylvania inadvertently ran a real-life experiment providing evidence of status quo bias in the early 1990s. As part of tort law reform programs, citizens were offered two options for their automotive insurance: an expensive option giving them full right to sue and a less expensive option with restricted rights to sue. In New Jersey the cheaper option was the default and most citizens selected it. Only a minority chose the cheaper option in Pennsylvania, where the more expensive option was the default.\n",
"Some drivers opt to buy the insurance as a means of protection against costly breakdowns unrelated to an accident. In contrast to more standard and basic coverages such as comprehensive and collision insurance, auto repair insurance does not cover a vehicle when it is damaged in a collision, during a natural disaster or at the hands of vandals.\n"
] |
Why was the 5.56mm round chosen as the NATO standard? | in 1977 NATO agreed to adopt a 2nd round in addition to the 7.62x51mm round, specifically the SS109 steel tipped round which was designed to pierce a soviet style steel helmet at 600 meters.
Jane's Infantry Weapons 1986–1987, pg. 362
The Small Arms Review vol.10, no.2 November 2006.
It's 4am and I haven't looked into the details of the agreement but I'm assuming it's related to the US introducing the M16 and 5.56mm round in 1960. | [
"Therefore, in March 1970, the U.S. recommended that all NATO forces adopt the 5.56×45mm cartridge. This shift represented a change in the philosophy of the military's long-held position about caliber size. By the middle of the 1970s, other armies were looking at assault rifle type weapons. A NATO standardization effort soon started and tests of various rounds were carried out starting in 1977. The U.S. offered the 5.56×45mm M193 round, but there were concerns about its penetration in the face of the wider introduction of body armor. In the end, the Belgian 5.56×45mm SS109 round was chosen (STANAG 4172) in October 1980. The SS109 round was based on the U.S. cartridge but included a new stronger, heavier, 62 grain bullet design, with better long range performance and improved penetration (specifically, to consistently penetrate the side of a steel helmet at 600 meters).\n",
"When 5.56×45mm NATO was adopted as standard in 1980, NATO chose a 178 mm (1-in-7\") rifling twist rate for the 5.56×45mm NATO chambering to adequately stabilize the relatively long NATO L110/M856 5.56×45mm NATO tracer projectile. The US at that time converted all rifles in inventory by replacing the barrels and all new US military rifles since have been manufactured with this ratio.\n",
"By the 1960s, after becoming involved in War in Vietnam, the US did an abrupt about-face and decided to standardize on the intermediate 5.56×45mm round (based on the .223 Remington varmint cartridge) fired from the new, lightweight M16 rifle, leaving NATO to hurry and catch up. Many of the NATO countries couldn't afford to re-equip so soon after the recent 7.62mm standardization, leaving them armed with full-power 7.62mm battle rifles for some decades afterwards, although by this point, the 5.56mm has been adopted by almost all NATO countries and many non-NATO nations as well. This 5.56mm NATO round was even lighter and smaller than the Soviet 7.62×39mm AK-47 cartridge, but possessed higher velocity. In U.S. service, the M16 assault rifle replaced the M14 as the standard infantry weapon, although the M14 continued to be used by designated marksmen. Although at 20\", the barrel of the M16 was shorter than that of the M14, it was still designated a \"rifle\" rather than a \"carbine\", and it was still longer than the AK, which used a 16\" barrel. (The SKS – an interim, semi-automatic, weapon adopted a few years before the AK-47 was put into service – was designated a carbine, even though it's 20\" barrel was significantly longer than the AK series' 16.3\". This is because of the Kalashnikov's revolutionary nature, which altered the old paradigm. Compared to previous rifles, particularly the Soviets' initial attempts at semi-automatic rifles, such as the 24\" SVT-40, the SKS was significantly shorter. The Kalashnikov altered traditional notions and ushered in a change in what was considered a \"rifle\" in military circles.)\n",
"In March 1970, the U.S. recommended that all NATO forces adopt the 5.56×45mm cartridge. This shift represented a change in the philosophy of the military's long-held position about caliber size. By the mid 1970s, other armies were looking at M16-style weapons. A NATO standardization effort soon started and tests of various rounds were carried out starting in 1977. The U.S. offered the 5.56×45mm M193 round, but there were concerns about its penetration in the face of the wider introduction of body armor. In the end the Belgian 5.56×45mm SS109 round was chosen (STANAG 4172) in October 1980. The SS109 round was based on the U.S. cartridge but included a new stronger, heavier, 62 grain bullet design, with better long range performance and improved penetration (specifically, to consistently penetrate the side of a steel helmet at 600 meters). Due to its design and lower muzzle velocity (about 3110 ft/s) the Belgian SS109 round is considered more humane because it is less likely to fragment than the U.S. M193 round. The NATO 5.56×45mm standard ammunition produced for U.S. forces is designated M855.\n",
"In March 1970, the U.S. recommended that all NATO forces adopt the 5.56×45mm cartridge. This shift represented a change in the philosophy of the military's long-held position about caliber size. By the mid 1970s, other armies were looking at M16-style weapons. A NATO standardization effort soon started and tests of various rounds were carried out starting in 1977. The U.S. offered the 5.56×45mm M193 round, but there were concerns about its penetration in the face of the wider introduction of body armor. In the end the Belgian 5.56×45mm SS109 round was chosen (STANAG 4172) in October 1980. The SS109 round was based on the U.S. cartridge but included a new stronger, heavier, 62 grain bullet design, with better long range performance and improved penetration (specifically, to consistently penetrate the side of a steel helmet at 600 meters). Due to its design and lower muzzle velocity (about 3110 ft/s) the Belgian SS109 round is considered more humane because it is less likely to fragment than the U.S. M193 round. The NATO 5.56×45mm standard ammunition produced for U.S. forces is designated M855.\n",
"In March 1970, the U.S. recommended that all NATO forces adopt the 5.56×45mm cartridge. This shift represented a change in the philosophy of the military's long-held position about caliber size. By the middle of the 1970s, other armies were looking at assault rifle type weapons. A NATO standardization effort soon started and tests of various rounds were carried out starting in 1977. The U.S. offered the 5.56×45mm M193 round, but there were concerns about its penetration in the face of the wider introduction of body armor. In the end the Belgian 5.56×45mm SS109 round was chosen (STANAG 4172) in October 1980. The SS109 round was based on the U.S. cartridge but included a new stronger, heavier, 62 grain bullet design, with better long range performance and improved penetration (specifically, to consistently penetrate the side of a steel helmet at 600 meters).\n",
"The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO) is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, SS110, and SS111 cartridges. On 28 October 1980 under STANAG 4172 it was standardized as the second standard service rifle cartridge for NATO forces as well as many non-NATO countries. The 5.56×45mm NATO cartridge family was derived from, but is not identical to, the .223 Remington cartridge designed by Remington Arms in the early 1960s.\n"
] |
why is the death of one lion such a huge story but the extinction of rhinos in the wild barely makes the news? | Because people want something to be upset about and this is the newest thing. Two weeks ago, no one ever even knew about this goddamn lion. The news said we should be mad, so everyone got pissed. Outrage gives people a feeling of purpose. | [
"The zoo witnessed a series of animal deaths in 2004 and 2005. In August 2004, a Lion-tailed macaque was found mysteriously dead. An emu and a tiger were also reported to have died mysteriously. On 4 September 2004, an elephant died, reportedly of acute hemorrhagic enteritis and respiratory distress. It was reported that the illness in elephants was due to poisoning. As a safety measure, the zoo authority suspended several staff members who were allegedly responsible for the \"gruesome killings\". Laboratory tests later confirmed that the two elephants, named Ganesha and Roopa, had been poisoned. This was followed by another elephant death (Komala) on 7 September despite heightened security. Komala had been scheduled to be transferred to Armenia in about a month.\n",
"Rhinos, annihilated in Vietnam in 2010, are also threatened with extinction as a result of wildlife trade: in 2007, 13 were killed for their horns. By 2014, the number had ballooned; 1215 rhinos were poached and killed in South Africa in just one year.\n",
"The killing resulted in international media attention, caused outrage among animal conservationists, criticism by politicians and celebrities and a strong negative response against Palmer. Five months after the killing of Cecil, the U.S. Fish and Wildlife Service added lions in India and West and Central Africa to the endangered species list, making it more difficult for United States citizens to legally kill lions. According to Wayne Pacelle, then President of the Humane Society, Cecil had \"changed the atmospherics on the issue of trophy hunting around the world,\" adding \"I think it gave less wiggle room to regulators.\"\n",
"The Asiatic lion currently exists as a single subpopulation, and is thus vulnerable to extinction from unpredictable events, such as an epidemic or large forest fire. There are indications of poaching incidents in recent years. There are reports that organized gangs have switched attention from tigers to these lions. There have also been a number of drowning incidents after lions fell into wells.\n",
"Although Patterson claimed the lions were responsible for up to 135 deaths, a peer-reviewed paper on man-eating lions and the circumstances surrounding this notorious event states that only about 28–31 killings can be verified (Kerbis Peterhans & Gnoske, 2001). (This figure does not take into account any people who may have been killed but not eaten by the animals.)\n",
"Their past extinction was due to tigers—precisely, the Balinese tiger—and humans hunting them for their antlers and pelts. Their main predators now are humans, leopards, dholes (the Asiatic wild dog), pythons, and crocodiles.\n",
"Poaching of birds and other mammals is another serious issue. A high number of elephant deaths have been reported from this park, with nearly 100 elephants dying between 1991–92 and 2004-05 in the Kodagu and Hunsur Forest Division (PA Update 2005). Elephants are killed for their ivory. A study carried out by Wildlife First! found that nearly 77 elephants were reported dead between 1 January 2000 and 31 October 2002. Another study carried out by the Institute for Natural Resources, Conservation, Education, Research and Training (INCERT) in 2002 revealed that as many as seven elephants had been killed earlier that year.\n"
] |
Looking for some career guidance. (post-undergrad) | Your question is certainly welcome here but you might want to try posting it to /r/AskAcademia too – they're good with career advice. | [
"The Career Days is a project organized by the international organization called AIESEC. Its main aim is to inform students about the actual offers on the labor market. Students are encouraged to come into direct contact with potential employers of various companies and exchange information with them. The project consists of two parts: job and internship fair and The Academy of Skills. \n",
"My Career is a national bi-annual comprehensive magazine for Canadian university and college students. It discusses life choices after graduation, such as career development, post-graduate education and working/travelling abroad (see work abroad) in addition to articles related to campus life, healthy living, student finances and maintaining a work-life balance.\n",
"The Career Development Center motivates students and graduates to self-plan and structure their career goals, helps them to adapt to the contemporary labor market, and ensures full professional career realization. The main purpose is to assist graduates in finding employment and developing careers after graduation, as well as connecting employers with potential employees.\n",
"The Career Center was established in 1989 and has provided students as well as alumni with personal and career development counseling and advice. The Center maintains links to a wide range of local and regional public sector organizations and private corporations. Every year the Career Center invites distinguished professionals from various fields to talk to students helping them broaden their scope and understanding of the job market as well as refine their own professional choices. European University Cyprus has adopted and developed several specialized tools to assist its students including the Employability Database and the Ariadne Psychometric Tool and is an active member of the International Association for the Exchange of Students for Technical Experience IAESTE.\n",
"My Career Info is a not-for-profit career site developed and run by the Council of Ontario Universities. The site is designed to help students, graduates, and entry-level workers access campus career services, build a strong portfolio, gain budgeting skills, and find a job that fits with their education, skills and interests. They update the site regularly with the latest news from the job sector, including new job apps, resume and interview tips, and career advice. It is designed to help students incorporate career planning directly into their degree.\n",
"The career center offers classes related to specific fields. These classes, usually about 1.5 hours (two periods) long, are designed to help students gain a better understanding in that specific field, and better prepares them for it. They are taught by professionals in that specific industry. They include:\n",
"For graduate students pursuing academic careers, IHS sponsors an annual research colloquium, policy research seminars and invitation-only Career Development Seminars designed to help students \"land a job in academia, gain tenure, and contribute to the academic and intellectual conversation.\"\n"
] |
how come i can see a vein bulging out of my left bicep, but not my right, even though i work out each arm equally? | Your body is not an anatomical mirror. Your left side does not mirror your rigt side. Same as your left index finger is not identical to your right index finger. Thus your veins runs 'differently' in your body, meaning that some are close to the skin and some are not.
Another contributing factor might also be that you havent always exercised like now, and from childhood may have had a prefered arm (and leg) you used more than the other, leading to this arm being repetitively used more throughout life.
Nb! I am not a native english speaker. | [
"\"The other runs upward by the right veins in the lungs and divides into branches for the heart and the right arm. The remaining part of it rises across the clavicle to the right side of the neck, and is superficial so as to be seen; near the ear it is concealed, and there it divides; its thickest, largest, and most hollow part ends in the brain; another small vein goes to the right ear, another to the right eye, and another to the nostril. Such are the distributions of the hepatic vein.\"\n",
"The posterior intercostal veins are veins that drain the intercostal spaces posteriorly. They run with their corresponding posterior intercostal artery on the underside of the rib, the vein superior to the artery. Each vein also gives off a dorsal branch that drains blood from the muscles of the back.\n",
"The ascending lumbar vein is a paired structure (i.e. one each for the right and left sides of the body). It starts at the lateral sacral veins, and it runs superiorly, intersecting with the lumbar veins as it crosses them.\n",
"A peripherally inserted central catheter, or PICC line (pronounced \"pick\"), is a central venous catheter inserted into a vein in the arm (via the basilic or cephalic veins) rather than a vein in the neck or chest. The tip is positioned in the superior vena cava.\n",
"It then turns backward and passes from left to right behind the omental bursa and drains into the portal vein. Thus, it acts as collaterals between the portal veins and the systemic venous system of the lower esophagus (azygous vein).\n",
"On the left side it occasionally gives passage to the vertebral artery; more frequently the vertebral vein traverses it on both sides; but the usual arrangement is for both artery and vein to pass in front of the transverse process, and not through the foramen.\n",
"The right marginal vein is a small vein that drains blood from the heart. It passes along the inferior margin of the heart and joins the small cardiac vein (sometimes known as the right coronary vein) in the coronary sulcus, or opens directly into the right atrium.\n"
] |
milk expiration dates | If you say that it's literally same exact milk (same brand, same type, same size, etc) then its probably different stocks. Lets say Whole Foods bought milk 2 weeks ago and Safeway bought theirs 2 days ago. So WF's milk is older, and thus expires sooner.
However if you mean that brands are different, but product is essentially same - then it depends on what kind of milk it is, how it was processed, how it was made, from what animals (cows, goats, almonds (yes - almond is an animal :P )) etc. Pasteurised vs natural, etc.
No, the expiration date is not dictated by retailer. Rather its dictated by producer - whoever produces it marks it on the package. | [
"The shelf life of canned evaporated milk varies according to both its added content and its proportion of fat. For the regular unsweetened product a life of fifteen months can be expected before any noticeable destabilization occurs.\n",
"Milk preserved by the UHT process does not need to be refrigerated before opening and has a much longer shelf life (six months) than milk in ordinary packaging. It is typically sold unrefrigerated in the UK, U.S., Europe, Latin America, and Australia.\n",
"The production of milk requires that the cow be in lactation, which is a result of the cow having given birth to a calf. The cycle of insemination, pregnancy, parturition, and lactation, followed by a \"dry\" period of about two months of forty-five to fifty days, before calving which allows udder tissue to regenerate. A dry period that falls outside this time frame can result in decreased milk production in subsequent lactation.\n",
"The dairy cow produces large amounts of milk in its lifetime. Production levels peak at around 40 to 60 days after calving. Production declines steadily afterwards until milking is stopped at about 10 months. The cow is \"dried off\" for about sixty days before calving again. Within a 12 to 14-month inter-calving cycle, the milking period is about 305 days or 10 months long. Among many variables, certain breeds produce more milk than others within a range of around 6,800 to 17,000 kg (15,000 to 37,500 lb) of milk per year.\n",
"High-temperature short-time (HTST) pasteurization, such as that used for milk ( for 15 seconds) ensures safety of milk and provides a refrigerated shelf life of approximately two weeks. In ultra-high-temperature (UHT) pasteurization, milk is pasteurized at for 1–2 seconds, which provides the same level of safety, but along with the packaging, extends shelf life to three months under refrigeration.\n",
"The production of milk requires that the cow be in lactation, which is a result of the cow having given birth to a calf. The cycle of insemination, pregnancy, parturition, and lactation is followed by a \"dry\" period of about two months before calving, which allows udder tissue to regenerate. A dry period that falls outside this time frames can result in decreased milk production in subsequent lactation. Dairy operations therefore include both the production of milk and the production of calves. Bull calves are either castrated and raised as steers for beef production or used for veal.\n",
"For its production full-cream pasteurized milk is used. Its coagulation, at , lasts 30 minutes, then the curd is twice chopped in extremely little fragments. Finally, the bulk mass is put for 8–16 hours in a damp location. The aging lasts either 3–5 months (in this case the product has an aromatic and fragrant flavour), or 8–12 months. There are rare truckles aged up to 36 months. Sometimes the crust is flavoured with marcs.\n"
] |
Is it possible to make an anti-matter atomic bomb? | Yes although we don't have anything close to the technology to make that. If exploded in a vacuum it would look the same as a regular nuclear bomb, if it was in contact with regular matter than there'd be an intense burst of gamma radiation as it annihilates with regular matter. | [
"Antimatter production and containment are currently impenetrable barriers (due to current technological limitations) to the creation of antimatter weapons. Quantities measured in grams will be required to achieve a destructive effect comparable with conventional nuclear weapons.\n",
"Antimatter has been considered as a trigger mechanism for nuclear weapons. A major obstacle is the difficulty of producing antimatter in large enough quantities, and there is no evidence that it will ever be feasible. However, the U.S. Air Force funded studies of the physics of antimatter in the Cold War, and began considering its possible use in weapons, not just as a trigger, but as the explosive itself.\n",
"An antimatter weapon is a theoretically possible device using antimatter as a power source, a propellant, or an explosive for a weapon. Antimatter weapons cannot yet be produced due to the current cost of production of antimatter (estimated at 63 trillion dollars per gram) given the extremely limited technology available to create it in sufficient masses to be viable in a weapon, and the fact that it annihilates upon touching ordinary matter, making containment very difficult.\n",
"Antimatter, which consists of particles resembling ordinary matter particles in most of their properties but having opposite electric charge, has been considered as a trigger mechanism for nuclear weapons. A major obstacle is the difficulty of producing antimatter in large enough quantities, and there is no evidence that it is feasible beyond the military domain. However, the U.S. Air Force funded studies of the physics of antimatter in the Cold War, and began considering its possible use in weapons, not just as a trigger, but as the explosive itself. A fourth generation nuclear weapon design is related to, and relies upon, the same principle as antimatter-catalyzed nuclear pulse propulsion.\n",
"Some researchers have examined the use of antimatter as an alternative fusion trigger, mainly in the context of antimatter-catalyzed nuclear pulse propulsion but also nuclear weapons. Such a system, in a weapons context, would have many of the desired properties of a pure fusion weapon. However, the technical barriers to producing and containing the required quantities of antimatter appear formidable, well beyond present capabilities.\n",
"Antimatter-catalyzed nuclear pulse propulsion proposes the use of antimatter as a \"trigger\" to initiate small nuclear explosions; the explosions provide thrust to a spacecraft. The same technology could theoretically be used to make very small and possibly \"fission-free\" (very low nuclear fallout) weapons (see pure fusion weapon). Antimatter-catalyzed weapons could be more discriminate and result in less long-term contamination than conventional nuclear weapons, and their use might therefore be more politically acceptable.\n",
"A still more speculative concept is antimatter catalyzed nuclear pulse propulsion, which would use tiny quantities of antimatter to catalyze a fission and fusion reaction, allowing much smaller fusion explosions to be created.\n"
] |
I've noticed on a lot of milk crates they say something along the lines of "using this for anything other than milk is punishable by law" was stealing milk crates ever such a big problem that they had to make a law to address it or was this just a precaution? | Yes, that is the case. During the 1970s and 80s these plastic crates were regularly pilfered because of their solid construction and light weight. Today manufacturers have copied these designs and they're sold in stores as consumer goods.
Some states have similar laws for shopping carts, possession is illegal. | [
"It was held that (1) the ban on plastic nonreturnable milk containers was rationally related to the achievement of legitimate state purposes and thus did not violate the equal protection or due process clauses of the Fourteenth Amendment, since the state legislature could rationally have decided that its ban on plastic nonreturnable milk jugs might foster greater use of environmentally desirable alternatives, even though another type of nonreturnable is permitted to continue in use, having concluded that nonreturnable, nonrefillable milk containers pose environmental hazards, it was not arbitrary or irrational to ban the most recent entry into the field while in effect \"grandfathering\" paperboard containers, and the legislature had concluded, on evidence sufficient to make the questions at least debatable, that the statute would help to conserve energy and ease the state's solid waste disposal problem, and (2) the statute did not violate the commerce clause, since it regulated even-handedly by prohibiting all milk retailers from selling their products in plastic, nonreturnable milk containers, without regard to whether the milk, the containers, or the sellers are from out of state, the burden imposed on interstate commerce was relatively minor and was not clearly excessive in light of the substantial state interest in promoting conservation of energy and other natural resources and easing solid waste disposal problems, and no approach with a lesser impact on interstate activities was available.\n",
"In the mid-20th century, a few milk products were packaged in nearly rimless cans, reflecting different construction; in this case, one flat surface had a hole (for filling the nearly complete can) that was sealed after filling with a quickly solidifying drop of molten solder. Concern arose that the milk contained unsafe levels of lead leached from this solder plug.\n",
"The case dealt with a federal law that prohibited filled milk (skimmed milk compounded with any fat or oil other than milk fat to resemble milk or cream) from being shipped in interstate commerce. The defendant, a company that traded in a form of filled milk consisting of condensed skim milk and coconut oil, argued that the law was unconstitutional because of both the Commerce Clause and the Due Process Clause.\n",
"Similarly, in \"Minnesota v. Clover Leaf Creamery Co.\", 449 U.S. 456 (1981) the Court upheld a state law that banned nonreturnable milk containers made of plastic but permitted other nonreturnable milk containers. The Court found that the existence of a burden on out-of-state plastic industry was not 'clearly excessive' in comparison to the state's interest in promoting conservation. And the court continued:\n",
"Milk crates and bottle crates are a form of reusable packaging used to ship to retail stores and to return empty bottles to the bottler or packager. These are usually moulded plastic designs expected to make several round trip shipments. Wood structures are also used.\n",
"In 1977, the Milk Marketing Board and the Ontario Government banned the shipping of milk in cans, and vehicles with stainless steel bulk tanks were put into use. In 1979, a study of the plant's milk waste treatment process was carried out by the Water Research Centre, which was researching methods of treating dairy waste.\n",
"The controversy centered on the narrow issue of whether the legislative classification between plastic and nonplastic, nonreturnable milk containers was rationally related to achievement of conservation.\n"
] |
how do the ads next to porn videos know where i am? | Kids these days are exposed to porn at a far too early age. | [
"The rest of the video alternates between the pitching of advertising ideas and the concepts being shown in real time. The advertisement within the video opens with a woman (Lauren Francesca) in a two-piece running outfit jogging down a street, who is later joined by a second woman (Nicola Fiori) also jogging and similarly dressed. The camera frequently pans from the shoes to their breasts and faces, and closed captioning reading \"sexual breathing\". Seeing the chief marketing director's bored reaction, the designers begin to incorporate more graphic ideas into the advertisement, including the joggers headbutting various bystanders to death and engaging in a lesbian kiss, to the approval of the director and his executives, who toast champagne to celebrate their success.\n",
"Article video marketing is a type of content marketing and advertising in which business create 30 seconds to 5-minute videos about specific topics. The videos are then uploaded to various video sharing websites like YouTube for distribution and exposure.\n",
"In-image advertising uses “data about the image, its tags, and the surrounding content to match images with ads that are contextually relevant.” Once a website owner integrates the scripts onto their publishing systems, site visitors can move their mouse over the images or look at an image for a certain amount of time to reveal an ad.\n",
"Video ads are shown either in in-game interstitials (e.g. when the game is loading a new screen) or through incentive-based advertising, i.e. you will get either an in-game reward or Facebook credits for watching an advertisement.\n",
"A site's advertisers often are selling sexual products or services, which may compromise the sites image as an educational site, as they may be the same advertisers as at a pornographic site. Some sites choose not to work with financial sponsors, instead relying on reader donations—however, generally only sites with high levels of web traffic can support themselves in this way.\n",
"The scenes are typically filmed in hotel rooms, usually in Central Europe. The actresses do not really know what the fake porn director does. Woodman shows the girls a Private magazine or some pornographic images and then inviting them to do something similar to what's displayed in the images. \n",
"While ads show hardcore pornographic pictures, the users are not allowed to upload pictures with sexual content as profile pictures and pictures showing hardcore sexual activity in the picture gallery.\n"
] |
how come americans have large portion sizes and relatively cheap prices for their food? | When you go to a restaurant, you pay for the service first, then for the actual food. As a rule of thumb, the ingredients usually make up only 1/4 to 1/3 of the costs. Additionally, the work of preparing a dish twice as large usually isn't twice as much for the chef.
So it comes down to the customer's expectations. Americans expect large meals, so the restaurants deliver - without hurting their profits much.
| [
"Portion sizes in the United States have increased markedly in the past several decades. For example, from 1977 to 1996, portion sizes increased by 60 percent for salty snacks and 52 percent for soft drinks. Importantly, larger product portion sizes and larger servings in restaurants and kitchens consistently increase food intake. Larger portion sizes may even cause people to eat more of foods that are ostensibly distasteful; in one study individuals ate significantly more stale, two-week-old popcorn when it was served in a large versus a medium-sized container.\n",
"Another example is refreshments and snacks sold in theaters, fairs, and other venues. Small servings are proportionally more expensive than large servings. Customers choose the bigger size even if it is more than they would like to eat or drink because it seems like a better deal.\n",
"In her preface to the first American edition in 1979, Grigson observed that although British and American cooks found each others' systems of measurement confusing (citing the US use of volume rather than weight for solid ingredients), the two countries were at one in suffering from supermarkets' obsession with the appearance rather than the flavour of vegetables. \n",
"A value menu (not to be confused with a value meal) is a group of menu items at a fast food restaurant that are designed to be the least expensive items available. In the US, the items are usually priced between $0.99 and $1.49. The portion size, and number of items included with the food, are typically related to the price.\n",
"Smaller communities have fewer choices in food retailers. Resident small grocers struggle to be profitable partly due to low sales numbers, which make it difficult to meet wholesale food suppliers' minimum purchasing requirements. The lack of competition and sales volume can result in higher food costs. For example, in New Mexico the same basket of groceries that cost rural residents $85, cost urban residents only $55. However, this is not true for all rural areas. A study in Iowa showed that grocers in four rural counties had lower costs on key foods that make up a nutritionally balanced diet than did larger supermarkets outside these food deserts (greater than 20 miles away).\n",
"Price encompasses the amount of money paid by the consumer in order to purchase the food product. When pricing the food products, the manufacturer must bear in mind that the retailer will add a particular percentage to the price on the wholesale product. This percentage amount differs globally. The percentage is used to pay for the cost of producing, packaging, shipping, storing and selling the food product. For example, the purchasing of a food product in a supermarket selling for $3.50 generates an income of $2.20 for the manufacturer.\n",
"Agricultural policy and techniques in the United States and Europe have led to lower food prices. In the United States, subsidization of corn, soy, wheat, and rice through the U.S. farm bill has made the main sources of processed food cheap compared to fruits and vegetables. Calorie count laws and nutrition facts labels attempt to steer people toward making healthier food choices, including awareness of how much food energy is being consumed.\n"
] |
Doesn't the speed of light disprove Fermi's paradox? | When discussing the Fermi paradox, people usually only talk about civilizations in the Milky Way galaxy. The distance between galaxies is far to great to consider an inter-galactic civilization (though it may be possible).
The diameter of the stellar disk of the Milky Way is only about 100,000 light-years. So if a civilization existed on the other side of the Milky Way and had the technology to peer on to the Earth, they would see a planet teeming with life! 100,000 years ago, the Earth was already inhabited by humans! | [
"In 1962 J. G. Fox pointed out that all previous experimental tests of the constancy of the speed of light were conducted using light which had passed through stationary material: glass, air, or the incomplete vacuum of deep space. As a result, all were thus subject to the effects of the extinction theorem. This implied that the light being measured would have had a velocity different from that of the original source. He concluded that there was likely as yet no acceptable proof of the second postulate of special relativity. This surprising gap in the experimental record was quickly closed in the ensuing years, by experiments by Fox, and by Alvager et al., which used gamma rays sourced from high energy mesons. The high energy levels of the measured photons, along with very careful accounting for extinction effects, eliminated any significant doubt from their results.\n",
"The paradoxical aspect of each of the described thought experiments arises from Einstein’s theory of special relativity, which proclaims the speed of light (approx. 300,000 km/s) is the upper limit of speed in our universe. The uniformity of the speed of light is so absolute that regardless of the speed of the observer as well as the speed of the source of light the speed of the light ray should remain constant.\n",
"Here, one does not regard the above result as a deduction from the Heisenberg theory, but as a \"basic hypothesis\" which is well established experimentally. This needs little explanation, e.g., in terms of the disturbance of instruments, but is merely our starting point for further analysis; as in Einstein's theory of special relativity, we start from the \"fact\" that the speed of light is a constant.\n",
"The second postulate of Einstein's theory of special relativity states that the speed of light is invariant, regardless of the velocity of the source from which the light emanates. The extinction theorem (essentially) states that light passing through a transparent medium is simultaneously extinguished and re-emitted by the medium itself. This implies that information about the velocity of light from a moving source might be lost if the light passes through enough intervening transparent material before being measured. All measurements previous to the 1960s intending to verify the constancy of the speed of light from moving sources (primarily using moving mirrors, or extraterrestrial sources) were made only after the light had passed through such stationary material — that material being that of a glass lens, the terrestrial atmosphere, or even the incomplete vacuum of deep space. In 1961, Fox decided that there might not yet be any conclusive evidence for the second postulate: \"This is a surprising situation in which to find ourselves half a century after the inception of special relativity.\" Regardless, he remained fully confident in special relativity, noting that this created only a \"small gap\" in the experimental record.\n",
"Teller remembered Fermi asking him, \"Edward, what do you think. How probable is it that within the next ten years we shall have clear evidence of a material object moving faster than light?\" Teller said, \"10^-6\" (one in a million). Fermi said, \"This is much too low. The probability is more like ten percent.\" Teller wrote in 1984 that this was \"the well known figure for a Fermi miracle.\"\n",
"The constancy of the speed of light was motivated by Maxwell's theory of electromagnetism and the lack of evidence for the luminiferous ether. There is conflicting evidence on the extent to which Einstein was influenced by the null result of the Michelson–Morley experiment. In any case, the null result of the Michelson–Morley experiment helped the notion of the constancy of the speed of light gain widespread and rapid acceptance.\n",
"Note that in this argument, we never assumed that energy could be transmitted faster than the speed of light. This shows that the results of the EPR experiment do not contradict the predictions of special relativity.\n"
] |
is taking a shot of 100 proof alcohol the same as taking 1.25 shots of 80 proof? | Essentially yes. Except for the additional water in the 80 proof alcohol. But there is just as much alcohol in both shots so it will have the same effect on your blood alcohol content. | [
"The concentration of alcohol in a beverage is usually stated as the percentage of alcohol by volume (ABV, the number of milliliters (ml) of pure ethanol in 100 ml of beverage) or as \"proof\". In the United States, \"proof\" is twice the percentage of alcohol by volume at 60 degrees Fahrenheit (e.g. 80 proof = 40% ABV). \"Degrees proof\" were formerly used in the United Kingdom, where 100 degrees proof was equivalent to 57.1% ABV. Historically, this was the most dilute spirit that would sustain the combustion of gunpowder.\n",
"Up to the 20th century, alcoholic spirits were assessed in the UK by mixing with gunpowder and testing the mixture to see whether it would still burn; spirit that just passed the test was said to be at 100° proof. The UK now uses percentage alcohol by volume at 20 °C (68 °F), where spirit at 100° proof is approximately 57.15% ABV; the US uses a \"proof number\" of twice the ABV at 60 °F (15.5 °C).\n",
"Alcohol proof is a measure of the content of ethanol (alcohol) in an alcoholic beverage. The term was originally used in England and was equal to about 1.821 times the alcohol by volume (ABV). The UK now uses the ABV standard instead of alcohol proof. In the United States, alcohol proof is defined as twice the percentage of ABV.\n",
"BULLET::::- 4. If consumption is proven by a preponderance of the evidence, it is an affirmative defense under paragraph c of subsection 1 that the defendant consumed a sufficient quantity of alcohol after driving or being in actual physical control of the vehicle, and before their blood or breath was tested, to cause the defendant to have a concentration of alcohol of 0.08 or more in their blood or breath. A defendant who intends to offer this defense at a trial or preliminary hearing must, not less than 14 days before the trial or hearing or at such other time as the court may direct, file and serve on the prosecuting attorney a written notice of that intent. \"\n",
"The term \"proof\" dates back to 16th century England, when spirits were taxed at different rates depending on their alcohol content. Spirits were tested by soaking a pellet of gunpowder in them. If the gunpowder could still burn, the spirits were rated above proof and taxed at a higher rate. As gunpowder would not burn if soaked in rum that contained less than 57.15% ABV, rum that contained this percentage of alcohol was defined as having 100 degrees proof. The gunpowder test was officially replaced by a specific gravity test in 1816.\n",
"BULLET::::2. After having consumed sufficient alcohol that he has, at any relevant time after the driving, an alcohol concentration of 0.08 or more. The results of a chemical analysis shall be deemed sufficient evidence to prove a person's alcohol concentration; or\n",
"BULLET::::- Overproof rums are much higher than the standard 40% ABV (80 proof), with many as high as 75% (150 proof) to 80% (160 proof) available. Two examples are Bacardi 151 or Pitorro moonshine. They are usually used in mixed drinks.\n"
] |
why do humans start getting body odor after they go through puberty? | Basically (the way I was taught this at least) you have two major types of sweat glands, apocrine and eccrine. Sweat produced by eccrine glands is mostly water. Apocrine sweat is more oily and contains a whole bunch of other stuff (which I won't get into). So bacteria can metabolize the components of apocrine sweat far more readily.
Apocrine glands (which are heavily concentrated in your pits and groin) are stimulated by sex hormones, the levels of which rise sharply during puberty. So you get an assload of oily sweat, which is then colonized by bacteria, who generate foul odors. | [
"The average beginning of pubarche varies due to many factors, including climate, nourishment, weight, nurture, and genes. First (and often transient) pubic hair resulting from adrenarche may appear between ages 10-12 preceding puberty.\n",
"Before puberty effects of rising androgen levels occur in both boys and girls. These include adult-type body odor, increased oiliness of skin and hair, acne, pubarche (appearance of pubic hair), axillary hair (armpit hair), growth spurt, accelerated bone maturation, and facial hair.\n",
"Estrogens are responsible for the development of female secondary sexual characteristics during puberty, including breast development, widening of the hips, and female fat distribution. Conversely, androgens are responsible for pubic and body hair growth, as well as acne and axillary odor.\n",
"Apocrine sweat glands secrete sweat into the pubic hair follicles. This is broken down by bacteria on the skin and produces an odor, which some consider to act as an attractant sex pheromone. The labia minora may grow more prominent and undergo changes in color. At puberty the first monthly period known as menarche marks the onset of menstruation.\n",
"In humans, the formation of body odor happens mostly in the axillary region. These odorant substances serve as pheromones which play a role related to mating. The underarm regions seem more important than the genital region for body odor which may be related to human bipedalism.\n",
"The principal physical consequences of adrenarche are androgen effects, especially pubic hair (in which Tanner stage 2 becomes Tanner stage 3) and the change of sweat composition that produces adult body odor. Increased oiliness of the skin and hair and mild acne may occur. In most boys, these changes are indistinguishable from early testicular testosterone effects occurring at the beginning of gonadal puberty. In girls, the adrenal androgens of adrenarche produce most of the early androgenic changes of puberty: pubic hair, body odor, skin oiliness, and acne. In most girls the early androgen effects coincide with, or are a few months following, the earliest estrogenic effects of gonadal puberty (breast development and growth acceleration). As female puberty progresses, the ovaries and peripheral tissues become more important sources of androgens.\n",
"Pregnant women have increased smell sensitivity, sometimes resulting in abnormal taste and smell perceptions, leading to food cravings or aversions. The ability to taste also decreases with age as the sense of smell tends to dominate the sense of taste. Chronic smell problems are reported in small numbers for those in their mid-twenties, with numbers increasing steadily, with overall sensitivity beginning to decline in the second decade of life, and then deteriorating appreciably as age increases, especially once over 70 years of age.\n"
] |
Do bone conduction earphones protect hearing? | There's no reason to believe that they would. Hearing loss is usually caused by damage to the inner ear, which is still getting as much sound exposure with bone conduction as it would through the normal path of sound. | [
"It is a semi-implantable under the skin bone conduction hearing device coupled to the skull by a titanium fixture. The system transfers sound to the inner ear through the bone, thereby bypassing problems in the outer or middle ear. Candidates with a conductive, mixed or single-sided sensorineural hearing loss can therefore benefit from bone conduction hearing solutions.\n",
"Ear protection refers to devices used to protect the ear, either externally from elements such as cold, intrusion by water and other environmental conditions, debris, or specifically from noise. High levels of exposure to noise may result in noise-induced hearing loss. Measures to protect the ear are referred to as hearing protection, and devices for that purpose are called hearing protection devices. In the context of work, adequate hearing protection is that which reduces noise exposure to below 85 dBA over the course of an average work shift of eight hours.\n",
"Bone conduction is the conduction of sound to the inner ear primarily through the bones of the skull, allowing the hearer to perceive audio content without blocking the ear canal. Bone conduction transmission occurs constantly as sound waves vibrate bone, specifically the bones in the skull, although it is hard for the average individual to distinguish sound being conveyed through the bone as opposed to sound being conveyed through air via the ear canal. Intentional transmission of sound through bone can be used with individuals with normal hearing - as with bone-conduction headphones - or as a treatment option for certain types of hearing impairment. Bone generally conveys lower-frequency sounds better than higher frequency sound.\n",
"Bone-anchored hearing aids use a surgically implanted abutment to transmit sound by direct conduction through bone to the inner ear, bypassing the external auditory canal and middle ear. A titanium prosthesis is surgically embedded into the skull with a small abutment exposed outside the skin. A sound processor sits on this abutment and transmits sound vibrations to the titanium implant. The implant vibrates the skull and inner ear, which stimulate the nerve fibers of the inner ear, allowing hearing.\n",
"Dual hearing protection refers to the use of earplugs under ear muffs. This type of hearing protection is particularly recommended for workers in the Mining industry because they are exposed to extremely high noise levels, such as an 105 dBA TWA. Fortunately, there is an option of adding electronic features to dual hearing protectors. These features help with communication by making speech more clear, especially for those workers who already have hearing loss. \n",
"Patients with chronic ear infection where the drum and/or the small bones in the middle ear are damaged often have hearing loss, but difficulties in using a hearing aid fitted in the ear canal. Direct bone conduction through a vibrator attached to a skin-penetrating implant addresses these disadvantages.\n",
"A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise to help prevent noise-induced hearing loss. HPDs reduce (not eliminate) the level of the noise entering the ear. HPDs can also protect against other effects of noise exposure such as tinnitus and hyperacusis. There are many different types of HPDs available for use, including earmuffs, earplugs, electronic hearing protection devices, and semi-insert devices. \n"
] |
why do circles tesselate hexagonally? | It's all geometry. Assuming equal radii between all circles, if you place them in a way that they don't intersect but touch each other at exactly one point (tessellating) and you start with just 3 circles, those circles form a triangle shape. If you connect the centerpoints of those circles, it forms an equilateral triangle (equal length sides, each corner is 60°). So if you continue placing circles the same way around that center circle, you can do that a total of 6 times because 360°/60°=6. A hexagon has 6 sides. Hope this helps. | [
"A study by David George Kendall used the techniques of shape analysis to examine the triangles formed by standing stones to deduce if these were often arranged in straight lines. The shape of a triangle can be represented as a point on the sphere, and the distribution of all shapes can be thought of as a distribution over the sphere. The sample distribution from the standing stones was compared with the theoretical distribution to show that the occurrence of straight lines was no more than average.\n",
"A tessellation, also known as a tiling, is a set of shapes that must cover the entire plane without the shapes overlapping. This repeating shape must cover every part of the plane without overlapping. An edge tessellation, is a special type of tessellation that is created by flipping or reflecting the shape over an edge. This can also be called a \"folding\" tessellation.\n",
"By considering the family of maximally dense packings of the smoothed octagon, the requirement that the packing density remain the same as the point of contact between neighbouring octagons changes can be used to determine the shape of the corners. In the figure, three octagons rotate while the area of the triangle formed by their centres remains constant, keeping them packed together as closely as possible. For regular octagons, the red and blue shapes would overlap, so to enable the rotation to proceed the corners are clipped by a point that lies halfway between their centres, generating the required curve, which turns out to be a hyperbola.\n",
"The circle symbolizes unity and diversity in nature, and many Islamic patterns are drawn starting with a circle. For example, the decoration of the 15th-century mosque in Yazd, Persia is based on a circle, divided into six by six circles drawn around it, all touching at its centre and each touching its two neighbours' centres to form a regular hexagon. On this basis is constructed a six-pointed star surrounded by six smaller irregular hexagons to form a tessellating star pattern. This forms the basic design which is outlined in white on the wall of the mosque. That design, however, is overlaid with an intersecting tracery in blue around tiles of other colours, forming an elaborate pattern that partially conceals the original and underlying design. A similar design forms the logo of the Mohammed Ali Research Center.\n",
"A Reuleaux triangle is a shape formed from the intersection of three circular disks, each having its center on the boundary of the other two. Its boundary is a curve of constant width, the simplest and best known such curve other than the circle itself. Constant width means that the separation of every two parallel supporting lines is the same, independent of their orientation. Because all its diameters are the same, the Reuleaux triangle is one answer to the question \"Other than a circle, what shape can a manhole cover be made so that it cannot fall down through the hole?\"\n",
"One method of squaring the circle, due to Archimedes, makes use of an Archimedean spiral. Archimedes also showed how the spiral can be used to trisect an angle. Both approaches relax the traditional limitations on the use of straightedge and compass in ancient Greek geometric proofs.\n",
"The eigenvalues of the circle system plotted in the complex plane form a trefoil shape. The eigenvalues from a short line form a sideways Y, but those of a long line begin to resemble the trefoil shape of the circle. This could be due to the fact that a long line is indistinguishable from a circle to those species far from the ends.\n"
] |
Where do vegetables and fruit/nut bearing plants get their vitamins and minerals? | They get all the minerals they need from the soil. Vitamins for plants aren't the same necessarily as our vitamins, because a vitamin is something the organism needs to survive but cannot produce on its own (vitamin D is not a true vitamin to us).
So, for example, plants can produce vitamin C (ascorbic acid) through a glucose metabolism pathway. We do not have this pathway and need to consume it. Additionally, plants can make alpha-linolenic acid (ALA) which is the first omega-3 fatty acid. We cannot make ALA because we lack desaturase enzymes beyond 9, whereas 12 and 15 are required to form ALA from stearic acid.
But essentially plants, being autotrophs, only get some things from soil and air; the rest they can synthesize. | [
"Vitamins and minerals are required for normal metabolism but which the body cannot manufacture itself and which must therefore come from external sources. Vitamins come from several sources including fresh fruit and vegetables (Vitamin C), carrots, liver (Vitamin A), cereal bran, bread, liver (B vitamins), fish liver oil (Vitamin D) and fresh green vegetables (Vitamin K). Many minerals are also essential in small quantities including iron, calcium, magnesium, sodium chloride and sulfur; and in very small quantities copper, zinc and selenium. The micronutrients, minerals, and vitamins in fruit and vegetables may be destroyed or eluted by cooking. Vitamin C is especially prone to oxidation during cooking and may be completely destroyed by protracted cooking. The bioavailability of some vitamins such as thiamin, vitamin B6, niacin, folate, and carotenoids are increased with cooking by being freed from the food microstructure. Blanching or steaming vegetables is a way of minimizing vitamin and mineral loss in cooking.\n",
"At least 17 elements are known to be essential nutrients for plants. In relatively large amounts, the soil supplies nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur; these are often called the macronutrients. In relatively small amounts, the soil supplies iron, manganese, boron, molybdenum, copper, zinc, chlorine, and cobalt, the so-called micronutrients. Nutrients must be available not only in sufficient amounts but also in appropriate ratios.\n",
"They are also good sources of vitamin C and flavonoids. The content of vitamin C in the fruit depends on the species, variety, and mode of cultivation. Fruits produced with organic agriculture have been shown to contain more vitamin C than those produced with conventional agriculture in the Algarve, but results depended on the species and cultivar.\n",
"While plant foods are generally a good source of vitamin C, the amount in foods of plant origin depends on the variety of the plant, soil condition, climate where it grew, length of time since it was picked, storage conditions, and method of preparation. The following table is approximate and shows the relative abundance in different raw plant sources. As some plants were analyzed fresh while others were dried (thus, artificially increasing concentration of individual constituents like vitamin C), the data are subject to potential variation and difficulties for comparison. The amount is given in milligrams per 100 grams of the edible portion of the fruit or vegetable:\n",
"BULLET::::- Vitamin C (ascorbic acid) is a water-soluble compound that fulfills several roles in living systems. Sources include citrus fruits (such as oranges, sweet lime, etc.), green peppers, broccoli, green leafy vegetables, black currants, strawberries, blueberries, seabuckthorn, raw cabbage and tomatoes.\n",
"Aside from performed vitamin A, vitamin B and vitamin D, all vitamins found in animal source foods may also be found in plant-derived foods. Examples are tofu to replace meat (both contain protein in sufficient amounts), and certain seaweeds and vegetables as respectively kombu and kale to replace dairy foods as milk (both contain calcium in sufficient amounts). There are some nutrients which are rare to find in sufficient density in plant based foods. One example would be zinc, the exception would be pumpkin seeds that have been soaked for improved digestion. The increased fiber in these foods can also make absorption difficult. Deficiencies are very possible in these nutrients if vegetarians are not very careful and willing to eat sufficient quantities of these exceptional plant based foods. A good way to find these foods would be to search for them on one of the online, nutrient analyzing databases. An example would be nutritiondata.com.\n",
"The nutrients required for healthy plant life are classified according to the elements, but the elements are not used as fertilizers. Instead compounds containing these elements are the basis of fertilizers. The macro-nutrients are consumed in larger quantities and are present in plant tissue in quantities from 0.15% to 6.0% on a dry matter (DM) (0% moisture) basis. Plants are made up of four main elements: hydrogen, oxygen, carbon, and nitrogen. Carbon, hydrogen and oxygen are widely available as water and carbon dioxide. Although nitrogen makes up most of the atmosphere, it is in a form that is unavailable to plants. Nitrogen is the most important fertilizer since nitrogen is present in proteins, DNA and other components (e.g., chlorophyll). To be nutritious to plants, nitrogen must be made available in a \"fixed\" form. Only some bacteria and their host plants (notably legumes) can fix atmospheric nitrogen (N) by converting it to ammonia. Phosphate is required for the production of DNA and ATP, the main energy carrier in cells, as well as certain lipids.\n"
] |
What's the noise a formula 1 makes when it changes gears? | It's most likely a backfire. When the car is accelerating its at full throttle/load, and the engine runs out of power, so it's time to change gears. imagine going from full throttle to no throttle (changing gears) then back to full throttle.
The bang u hear is unburnt fuel exploding in the exhaust after its left the combustion chamber, which is after engine has gone off full throttle to change gears.
It's excess fuel that was needed to sustain full power, but is no longer needed when off throttle. | [
"BULLET::::- Transmission problems were tackled by adding a further mounting-point (making five) for the whole engine and transmission assembly at the back of the gearbox where it was supported by an extra chassis cross-member. The transmission made a significant humming noise while in neutral and there were difficulties with excessive vibration from oil surge in the fluid flywheel when picking up under heavy load at low speed. The transmission mechanism for top-gear was modified to reduce pedal pressure and ensure positive engagement and disengagement while avoiding a humming sound in neutral.\n",
"The race start was delayed by 45 minutes due to the heavy rain. With the rain soaking the track, Niki Lauda sought out Bernie Ecclestone on the grid in a bid to have the tunnel flooded as well. The tunnel was dry but coated with oil from the previous days' use (as well as from the historic cars which were on the program that weekend) which Lauda explained had turned it into a fifth gear skid pad when the cars came racing in carrying the spray from their tyres in the morning warmup. Ecclestone used his power as the head of the Formula One Constructors Association to do exactly that, with a local fire truck called in to water down the only dry road on the track.\n",
"A modern F1 clutch is a multi-plate carbon design with a diameter of less than , weighing less than and handling around . race season, all teams are using seamless shift transmissions, which allow almost instantaneous changing of gears with minimum loss of drive. Shift times for Formula One cars are in the region of 0.05 seconds. In order to keep costs low in Formula One, gearboxes must last five consecutive events and since 2015, gearbox ratios will be fixed for each season (for 2014 they could be changed only once). Changing a gearbox before the allowed time will cause a penalty of five places drop on the starting grid for the first event that the new gearbox is used.\n",
"\"After engaging the first gear and a somewhat careless step on the gas pedal you get a touched feel to the epiphany GTV6 shot, accompanied by the typical Alfa Romeo exhaust sound. It was a pleasure. The fact was the sprint from 0 to is not further under the seven-second limited by a tricky-to-be-shifted five-speed gearbox. The really vehement propulsion waned only when the speedometer mark has left behind. Another eye-opening experience awaits when you realize that the lightning speed to 7000 rpm rotating in any gear pinion even in fifth gear still from 1500 rpm is completely smooth.\"\n",
"BULLET::::- Noise 2: This noise, commonly referred to as gear rattle, can be induced by lugging the engine in any gear, but is usually most noticeable in first or second gear. While the noise is occurring, if you press lightly on the clutch pedal without releasing the clutch, the noise will be reduced or eliminated.\n",
"Once the field was filled to 33 cars, bumping would begin. The slowest car in the field, regardless of the day it was qualified, was \"on the bubble.\" If a driver went out and qualified faster, the bubble car would be bumped, and the new qualifier would be added to the field. The bumped car would be removed from the grid, and all cars that were behind him would move up a spot. The new driver would take his position according to his speed rank on the day he qualified (typically the final day). This procedure would be repeated until the track closed at 6 p.m. on the final day of qualifying. Bumped cars could not be re-qualified. A bumped driver would have to secure a back-up car (assuming it had attempts left on it) in order to bump his way back into the field.\n",
"The sound was adopted as the sound of a Formula One car as early as 2001 in the form of \"Deng Deng Form\" and later \"The Insanity Test\" both of which were a static background of a Ferrari Formula One car accompanied by the sound.\n"
] |
what determines how internet lag in different games looks? | Male programmer type guy here. It just depends on how the programmers who made the game decided to handle the case where the game isn't getting updates from the server. Some games leave the character in place, and then warp him when the updates resume. Others avoid the warp by having the character fly from their old position to the new one. I seem to remember that neverwinter nights had a thing where it would try to estimate where the character would be based on their last position and trajectory, which led to weird glitches. I could be making that up though. | [
"Since the game requires information on the location of other players, there is sometimes a delay as this information travels over the network. This occurs in games where the input signals are \"held\" for several frames (to allow time for the data to arrive at every player's console/PC) before being used to render the next frame. At 25 FPS, holding 4 frames adds to the overall input lag. However, very few modern online games use this method. The view angle of every modern AAA shooter game is completely unaffected by network lag, for example. In addition, lag compensating code makes classification a complex issue.\n",
"Lag due to an insufficient update rate between client and server can cause some problems, but these are generally limited to the client itself. Other players may notice jerky movement and similar problems with the player associated with the affected client, but the real problem lies with the client itself. If the client cannot update the game state at a quick enough pace, the player may be shown outdated renditions of the game, which in turn cause various problems with hit- and collision detection. If the low update rate is caused by a low frame rate (as opposed to a setting on the client, as some games allow), these problems are usually overshadowed by numerous problems related to the client-side processing itself. Both the display and controls will be sluggish and unresponsive. While this may increase the perceived lag, it is important to note that it is of a different kind than network-related delays. In comparison, the same problem on the server may cause significant problems for all clients involved. If the server is unable or unwilling to accept packets from clients fast enough and process these in a timely manner, client actions may never be registered. When the server then sends out updates to the clients, they may experience freezing (unresponsive game) and/or rollbacks, depending on what types of lag compensation, if any, the game uses.\n",
"Testing has found that overall \"input lag\" (from controller input to display response) times of approximately are distracting to the user. It also appears that (excluding the monitor/television display lag) is an average response time and the most sensitive games (fighting games, first person shooters and rhythm games) achieve response times of (excluding display lag).\n",
"The noticeable effects of lag vary not only depending on the exact cause, but also on any and all techniques for lag compensation that the game may implement (described below). As all clients experience some delay, implementing these methods to minimize the effect on players is important for smooth gameplay. Lag causes numerous problems for issues such as accurate rendering of the game state and hit detection. In many games, lag is often frowned upon because it disrupts normal gameplay. The severity of lag depends on the type of game and its inherent tolerance for lag. Some games with a slower pace can tolerate significant delays without any need to compensate at all, whereas others with a faster pace are considerably more sensitive and require extensive use of compensation to be playable (such as the first-person shooter genre). Due to the various problems lag can cause, players that have an insufficiently fast Internet connection are sometimes not permitted, or discouraged from playing with other players or servers that have a distant server host or have high latency to one another. Extreme cases of lag may result in extensive desynchronization of the game state.\n",
"In the peer-to-peer gaming model, lagging is what happens when the stream of data between one or more players gets slowed or interrupted, causing movement to stutter and making opponents appear to behave erratically. By using a lag switch, a player is able to disrupt uploads from the client to the server, while their own client queues up the actions performed. The goal is to gain advantage over another player without reciprocation; opponents slow down or stop moving, allowing the lag switch user to easily outmaneuver them. From the opponent's perspective, the player using the device may appear to be teleporting, invisible or invincible, while the opponents suffer delayed animations and fast-forwarded game play, delivered in bursts. Some gaming communities refer to this method as \"tapping\" which refers to the users \"tapping\" on and off their internet connection to create the lag.\n",
"As an interesting first, this movie features the appearance of lag, a gameplay error due to network transfer slowdown often encountered in online games. Oshii displays lag as an ailment that causes physical convulsions in the player during these slowdowns.\n",
"Lag due to network delay is in contrast often less of a problem. Though more common, the actual effects are generally smaller, and it is possible to compensate for these types of delays. Without any form of lag compensation, the clients will notice that the game responds only a short time after an action is performed. This is especially problematic in first-person shooters, where enemies are likely to move as a player attempts to shoot them and the margin for errors is often small.\n"
] |
In the United States, have there been any particularly strong Vice Presidents, and how was The Senate different under them? | In addition to Calhoun, John Adams regularly presided over the Senate and partook in debates, and beats Calhoun by one vote for the most tie breaks.
That said, while they are the nominal head of the Senate, the Constitution also says that the House and Senate get to write their own procedural rules in Article I, Section V, Clause II:
> Each House may determine the Rules of its Proceedings, punish its Members for disorderly Behavior, and, with the Concurrence of two thirds, expel a member.
In practical terms, the Vice President doesn't have much power if the Senate decides to write the rules to say that they can't do anything other than break ties and be physically present, the only things the constitution explicitly grants them authority to do so. Something like Frank Underwood barging into the Senate and immediately taking over wouldn't really happen since at present, party leaders run the floor and they have junior senators sit in the presiding chair. | [
"He served as one of several alternating presidents pro tempore of the United States Senate during the 62nd Congress (1911 to 1913), as part of a compromise under which Bacon and four senators from the Republican majority rotated in the office because no single candidate in either party was able to secure a majority vote.\n",
"Over the next few decades the Senate rose in reputation in the United States and the world. John C. Calhoun, Daniel Webster, Thomas Hart Benton, Stephen A. Douglas, and Henry Clay overshadowed several presidents. Sir Henry Maine called the Senate \"the only thoroughly successful institution which has been established since the tide of modern democracy began to run.\" William Ewart Gladstone said the Senate was \"the most remarkable of all the inventions of modern politics.\"\n",
"A procedural issue of the early Senate was what role the vice president, the President of the Senate, should have. The first vice president was allowed to craft legislation and participate in debates, but those rights were taken away relatively quickly. John Adams seldom missed a session, but later vice presidents made Senate attendance a rarity. Although the founders intended the Senate to be the slower legislative body, in the early years of the Republic, it was the House that took its time passing legislation. Alexander Hamilton's Bank of the United States and Assumption Bill (he was then Treasury Secretary), both of which were controversial, easily passed the Senate, only to meet opposition from the House.\n",
"Richard Mentor Johnson (October 17, 1780 – November 19, 1850) was a politician and the ninth vice president of the United States from 1837 to 1841. He is the only vice president elected by the United States Senate under the provisions of the Twelfth Amendment. Johnson also represented Kentucky in the U.S. House of Representatives and Senate; he began and ended his political career in the Kentucky House of Representatives.\n",
" confers upon the vice president the title President of the Senate and authorizes him to preside over Senate meetings. In this capacity, the vice president is charged with maintaining order and decorum, recognizing members to speak, and interpreting the Senate's rules, practices, and precedent. The first two vice presidents, John Adams and Thomas Jefferson, both of whom gained the office by virtue of being runners-up in presidential contests, presided regularly over Senate proceedings, and did much to shape the role of Senate president. Several 19th century vice presidents—such as George Dallas, Levi Morton, and Garret Hobart—followed their example and led effectively, while others were rarely present.\n",
"There have been 48 vice presidents of the United States since the office came into existence in 1789. Originally, the vice president was the person who received the second most votes for president in the Electoral College. However, in the election of 1800 a tie in the electoral college between Thomas Jefferson and Aaron Burr led to the selection of the president by the House of Representatives. To prevent such an event from happening again, the Twelfth Amendment was added to the Constitution, creating the current system where electors cast a separate ballot for the vice presidency.\n",
"The Vice President of the United States, as provided by the United States Constitution formally presides over the upper house, the Senate. In practice, however, the Vice President has a rare presence in Congress owing to responsibilities in the Executive branch and the fact that the Vice President may only vote to break a tie. In the Vice President's absence, the presiding role is delegated to the most Senior member of the majority party, who is the President pro tempore of the United States Senate. Since the Senate's rules give little power to its non-member presider (who may be of the opposite party), the task of presiding over daily business is typically rotated among junior members of the majority party.\n"
] |
Do black holes really vary in size or does the collapsed point in space just vary in intensity? | Every amount of mass has some radius that, were it all to be compressed within the radius, it would form a black hole. This is called the Schwartzchild radius, and it's calculated by the formula r=2GM/c^2 . G is the gravitational constant, and c is the speed of light. These are both constant, so the math works out the same for them every time and the quantity of mass is the only variable that can alter the radius.
Interestingly, smaller black holes will spaghettify you much faster than larger black holes will. This is because of the tidal force. Anything that enters a black hole is stretched apart by its gravity. The gravitational force weakens with distance; the parts of you closer to the black hole (say, your feet, if you're falling straight in) end up attracted by its gravity more forcefully than the parts away from you (like your head, in this analogy). This effect magnifies as you are stretched more and more until... well, spaghettification is the scientific term for this for a reason.
With larger black holes, the difference in position of your head and your feet, relative to the size of the black hole, is smaller than it is with smaller black holes. Your feet will still be pulled more forcefully than your head, but the difference won't be as drastic. With a large enough black hole, you might be able to survive a decent part of your trip to the singularity.
So, the size of a black hole is dependent solely on its mass, but a more massive black hole will take longer to destroy you. Either way, you aren't getting out. | [
"In general relativity, if a star collapses to a size smaller than its Schwarzschild radius, an event horizon will exist at that radius and the star will become a black hole. Thus, the size of a preon star may vary from around 1 metre with an absolute mass of 100 Earths to the size of a pea with a mass roughly equal to that of the Moon.\n",
"A vacancy exists in the observed mass distribution of black holes. Black holes that spawn from dying stars have masses . The minimal supermassive black hole is approximately a hundred thousand solar masses. Mass scales between these ranges are dubbed intermediate-mass black holes. Such a gap suggests a different formation process. However, some models suggest that ultraluminous X-ray sources (ULXs) may be black holes from this missing group.\n",
"Black holes can be classified based on their Schwarzschild radius, or equivalently, by their density. As the radius is linearly related to mass, while the enclosed volume corresponds to the third power of the radius, small black holes are therefore much more dense than large ones. The volume enclosed in the event horizon of the most massive black holes has an average density lower than main sequence stars.\n",
"The maximally extended solution does not describe a typical black hole created from the collapse of a star, as the surface of the collapsed star replaces the sector of the solution containing the past-oriented \"white hole\" geometry and other universe.\n",
"Black holes are talked about in this chapter. Black holes are stars that have collapsed into one very small point. This small point is called a \"singularity\". Black holes suck things into their center because they have very strong gravity. Some of the things it can suck in are light and stars. Only very large stars, called \"super-giants\", are big enough to become a black hole. \n",
"Claims of intermediate mass black holes have been met with some skepticism. The heaviest objects in globular clusters are expected to migrate to the cluster center due to mass segregation. As pointed out in two papers by Holger Baumgardt and collaborators, the mass-to-light ratio should rise sharply towards the center of the cluster, even without a black hole, in both M15 and Mayall II.\n",
"On the other hand, the nature of the kind of singularity to be expected inside a black hole remains rather controversial. According to some theories, at a later stage, the collapsing object will reach the maximum possible energy density for a certain volume of space or the Planck density (as there is nothing that can stop it). This is when the known laws of gravity cease to be valid. There are competing theories as to what occurs at this point, but it can no longer really be considered gravitational collapse at that stage.\n"
] |
why do strange graphical effects sometimes occur when alt+tabbing a computer game? | It's because the game takes up the majority of your computer's resources and stays at the forefront. Your computer needs to load in all the other stuff that the OS and other programs need before you can use them. | [
"\"Glitching\" is also used to describe the state of a video game undergoing a glitch. The frequency in which a game undergoes glitching is often used by reviewers when examining the overall gameplay, or specific game aspects such as graphics. Some games such as Metroid have lower review scores today because in retrospect, the game may be very prone to glitches and be below what would be acceptable today.\n",
"Glitches may include incorrectly displayed graphics, collision detection errors, game freezes/crashes, sound errors, and other issues. Graphical glitches are especially notorious in platforming games, where malformed textures can directly affect gameplay (for example, by displaying a ground texture where the code calls for an area that should damage the character, or by \"not\" displaying a wall texture where there should be one, resulting in an invisible wall). Some glitches are potentially dangerous to the game's stored data.\n",
"Texture/model glitches are a kind of bug or other error that causes any specific model or texture to either become distorted or otherwise to not look as intended by the developers. Bethesda's \"\" is notorious for texture glitches, as well as other errors that affect many of the company's popular titles. Many games that use ragdoll physics for their character models can have such glitches happen to them.\n",
"Software errors not detected by software testers during development can find their way into released versions of computer and video games. This may happen because the glitch only occurs under unusual circumstances in the game, was deemed too minor to correct, or because the game development was hurried to meet a publication deadline. Glitches can range from minor graphical errors to serious bugs that can delete saved data or cause the game to malfunction. In some cases publishers will release updates (referred to as \"patches\") to repair glitches. Sometimes a glitch may be beneficial to the player; these are often referred to as exploits.\n",
"Crash to desktop bugs are considered particularly problematic for users. Since they frequently display no error message, it can be very difficult to track down the source of the problem, especially if the times they occur and the actions taking place right before the crash do not appear to have any pattern or common ground. One way to track down the source of the problem for games is to run them in windowed-mode. Windows Vista has a feature that can help track down the cause of a CTD problem when it occurs on any program. Windows XP included a similar feature as well.\n",
"\"Glitching\" is the practice of players exploiting faults in a video game's programming to achieve tasks that give them an unfair advantage in the game, over NPC's or other players, such as running through walls or defying the game's physics. Glitches can be deliberately induced in certain home video game consoles by manipulating the game medium, such as tilting a ROM cartridge to disconnect one or more connections along the edge connector and interrupt part of the flow of data between the cartridge and the console. This can result in graphic, music, or gameplay errors. Doing this, however, carries the risk of crashing the game or even causing permanent damage to the game medium.\n",
"Non-cosmetic modifications to a game, console, or controller are not allowed. Glitches that are triggered by interfering with the normal operation of the hardware or game media while the game is running, such as the crooked cartridge trick are not permitted. In-game glitches or exploits may be permissible, contingent on the category being run. \n"
] |
How much of time dilation is due to the gravity well versus relative velocity? | You can indeed separate the two effects if the field is weak. I've done the explicit computation for the orbit of Mercury around the sun [here](_URL_0_). It turns out that in a circular orbit the time dilation due to the orbital speed is exactly half the gravitational time dilation.
P.S.: GPS satellites are *not* in geosynchronous orbit. | [
"In 2010, Chou \"et al\". performed tests in which both gravitational and velocity effects were measured at velocities and gravitational potentials much smaller than those used in the mountain-valley experiments of the 1970s. It was possible to confirm velocity time dilation at the 10 level at speeds below 36 km/h. Also, gravitational time dilation was measured from a difference in elevation between two clocks of only .\n",
"Contrarily to velocity time dilation, in which both observers measure the other as aging slower (a reciprocal effect), gravitational time dilation is not reciprocal. This means that with gravitational time dilation both observers agree that the clock nearer the center of the gravitational field is slower in rate, and they agree on the ratio of the difference.\n",
"That is, the stronger the gravitational field (and, thus, the larger the acceleration), the more slowly time runs. The predictions of time dilation are confirmed by particle acceleration experiments and cosmic ray evidence, where moving particles decay more slowly than their less energetic counterparts. Gravitational time dilation gives rise to the phenomenon of gravitational redshift and Shapiro signal travel time delays near massive objects such as the sun. The Global Positioning System must also adjust signals to account for this effect.\n",
"Gravitational time dilation is at play e.g. for ISS astronauts. While the astronauts' relative velocity slows down their time, the reduced gravitational influence at their location speeds it up, although at a lesser degree. Also, a climber's time is theoretically passing slightly faster at the top of a mountain compared to people at sea level. It has also been calculated that due to time dilation, the core of the Earth is 2.5 years younger than the crust. \"A clock used to time a full rotation of the earth will measure the day to be approximately an extra 10 ns/day longer for every km of altitude above the reference geoid.\" Travel to regions of space where extreme gravitational time dilation is taking place, such as near a black hole, could yield time-shifting results analogous to those of near-lightspeed space travel.\n",
"Gravitational time dilation is experienced by an observer that, at a certain altitude within a gravitational potential well, finds that his local clocks measure less elapsed time than identical clocks situated at higher altitude (and which are therefore at higher gravitational potential).\n",
"Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events as measured by observers situated at varying distances from a gravitating mass. The higher the gravitational potential (the farther the clock is from the source of gravitation), the faster time passes. Albert Einstein originally predicted this effect in his theory of relativity and it has since been confirmed by tests of general relativity.\n",
"Gravitational time dilation is a phenomenon predicted by the theory of General Relativity whereby time passes more slowly in regions of lower gravitational potential. Scientists used the lander to test this hypothesis, by sending radio signals to the lander on Mars, and instructing the lander to send back signals, in cases which sometimes included the signal passing close to the Sun. Scientists found that the observed Shapiro delays of the signals matched the predictions of General Relativity.\n"
] |
how exactly is the “stop/start” automatic engine feature in newer cars “better”? | Barely any wear and tear, better for the environment as all that time you spend not moving while the engine running is time that CO2 and pollutants are spewing out when they don't need to be. Multiply all that time by millions and millions of cars and you have a significant CO2 saving.
Saves fuel and thus cash too. | [
"From 2011, Stop/Start was added to certain engines (engines with (S/S) are bold in CO2 column), a cleaner, more powerful 1.7 CDTI auto was added, and the petrol engines became slightly more efficient. A six speed automatic gearbox became available for the 1.4T (120) petrol engine.\n",
"The automatic transmission also has the ability to change the shift points, and hold the gears longer when the engine is operating at higher RPMs. This is achieved by pressing the accelerator pedal quickly, which causes an indicator light marked as \"Power\" at the bottom center of the instrument cluster to light up. The European and Australian version came equipped with a center console installed override switch labeled \"AT Econo\" which instructed the computer to utilize the \"Power\" mode, and remain so until the switch was reset to \"Econo\" mode. The \"Power\" mode was also available for engine braking, causing the transmission to downshift 500 rpm earlier than in \"normal\" mode. For 1991, the \"Manual\" button on the gearshift was replaced by a \"Econo\" switch on the gearshift, and the console mounted button was changed from \"AT Econo\" to \"Manual\", so that the transmission was always in \"Econo\" mode until the gearshift mounted switch was disengaged. Unlike the United States and Japanese version, which went into \"Power\" mode only when the accelerator was pushed rapidly, the \"Power\" mode on the European and Australian version was activated by either console or gearshift installed switches.\n",
"The automatic transmission also has the ability to change the shift points, and hold the gears longer when the engine is operating at higher RPM. This is achieved by pressing the accelerator pedal rapidly, which causes the transmission to hold the gear until 5000 rpm before shifting to the next gear. No indicator light appears in the instrument cluster, unlike previous generations. The transmission also has engine over-rev protection by shifting the transmission to the next available gear once 6500 rpm has been achieved, even if the gear selector is in a low gear position.\n",
"The Startix automatic engine starting mechanism was a relay in a small box added to the vehicle's electrical system. It automatically started an engine from cold or if stalled. It was supplied to vehicle manufacturers in the mid 1930s and later as an aftermarket accessory — in the USA by Bendix Aviation Corporation Eclipse Machine Division and in UK by Joseph Lucas & Son both of which businesses made electric self-starters. Such devices are now part of the engine management systems which switch off and on to conserve fuel.\n",
"For certain applications, the slippage inherent in automatic transmissions can be advantageous. For instance, in drag racing, the automatic transmission allows the car to stop with the engine at a high rpm (the \"stall speed\") to allow for a very quick launch when the brakes are released. In fact, a common modification is to increase the stall speed of the transmission. This is even more advantageous for turbocharged engines, where the turbocharger must be kept spinning at high rpm by a large flow of exhaust to maintain the boost pressure and eliminate the turbo lag that occurs when the throttle suddenly opens on an idling engine.\n",
"There was the appeal of the \"power everything\" car which automatically started its engine. Many early automatics had no lock up of their transmission, for example Dynaflow, Powerglide and Ultramatic though Hydramatic did. \n",
"Start/Stop technology on vehicles with automatic transmissions first appeared with the introduction of the new, more powerful (112 kW; 150 hp), B14XFT 1.4 litre direct injection (DI) VVT Turbo petrol engine for model year 2016 and was incorporated on other select petrol and diesel engines paired with automatic transmissions by model year 2018.\n"
] |
how do all the bodies, tanks etc. get cleaned off the battlefields? | Usually they don't. Outside of Kursk you can take a spade out West of the city and dig down just a few inches to human remains, shell casings, etc. Vehicles were only removed if they were salvageable or were in the way. After the war civilians gleaned the site for years for scrap but anything else was just abandoned. Modern armies recover bodies for burial, but when the battlefields are too massive sometimes they dont. Remains are still found in Flanders when someone digs a well and new phone line is laid.
In Germany the Allies employed POW's for years in work gangs cleaning up battlefields. Once a tank burns it is useless. The heat from the fire ruins the temper of the armor, so they were just abandoned. Military trucks were used as work horses all over Europe for years so people stripped all the wrecks of parts pretty quickly. The hulks got towed to scrap yards. | [
"To this day, the remains of missing soldiers are still found in the countryside around the town of Ypres. Typically, such finds are made during building work or road-mending activities. Any human remains discovered receive a proper burial in one of the war cemeteries in the region. If the remains can be identified, the relevant name is removed from the Menin Gate.\n",
"In the aftermath of a war, large areas of the region of conflict are often strewn with \"war debris\" in the form of abandoned or destroyed hardware and vehicles, mines, unexploded ordnance, bullet casings and other fragments of metal.\n",
"In July 2014, the EPA ordered the Army to clean up the site on the grounds, that the military should not have entrusted Explo Systems to handle such a large amount of the propellant. Three private firms, General Dynamics Corporation, Alliant Techsystems, and the Ashland, Inc., unit known as \"Hercules\" have been participating in the cleanup.\n",
"In the event that a water tank or tanker is contaminated, the following steps should be taken to reclaim the tank or tanker, if it is structurally intact. Additionally, it is recommended that tanks in continuous use are cleaned every five years, and for seasonal use, annually.\n",
"The Depot houses and operates a facility for the repair, restoration, and/or upgrade of infantry weapons such as the Beretta M9 pistol, M16 rifle, and M2 machine gun. Any firearm deemed unusable or obsolete is destroyed on the premises, the materials are reduced to unusable pieces and then sold for scrap to be melted down.\n",
"Rescues of an entrapped victim usually entail building makeshift retaining walls in the grain around them with plywood, sheet metal, tarpaulins, snow fences or any other similar material available. Once that has been done, the next step is creating the equivalent of a cofferdam within the grain from which grain can then be removed by hand, shovel, grain vacuum or other extraction equipment. While some of these techniques have been used to retrieve engulfed victims or their bodies as well, in those cases it is also common to attempt to cut a hole in the side of the storage facility; this requires consulting an engineer to make sure it can be done without compromising the facility's structural integrity. There is also the possibility of a dust explosion, although none are known to have occurred yet during a rescue attempt.\n",
"Recovery can be performed using manual winches or motor-assisted methods of recovery, using ground or vehicle-mounted recovery equipment (mostly winches and cranes), with the recovery of heavier vehicles such as tanks conducted by armoured wheel and track recovery vehicles (ARVs). During peacetime and in non-combat settings, various recovery vehicles can be used. In combat, under enemy fire, armies typically used armoured recovery vehicles, as the armour protects the crew from small arms fire and gives some protection from artillery and heavier fire. \n"
] |
why does our body need uv to create vitamin d when uv exposure increases our risk of skin cancer? | UV light is an energy source, since humans are automatically exposed in varying degrees to this energy source we have evolved to make use of the "free" energy to create vitamin D. We have also evolved to darken the skin to prevent over exposure to UV which would increase risks of skin cancer. Only animals like naked mole rats don't have to concern themselves about exposure to some degree or other to UV light _URL_0_ | [
"The sun's UV radiation is both a major cause of skin cancer and the best natural source of vitamin D. The risk of skin cancer from too much sun exposure needs to be balanced with maintaining adequate vitamin D levels. Vitamin D deficiency in Australia has also greatly increased, since sunblock also reduces vitamin D production in the skin. Although sunscreens could almost entirely block the solar-induced production of cutaneous previtamin D3 on theoretical grounds or if administered under strictly controlled conditions, in practice they have not been shown to do so. This is mainly due to inadequacies in their application to the skin and because users of sunscreen may also expose themselves to more sun than non-users.\n",
"UV light causes the body to produce vitamin D (specifically, UVB), which is essential for life. The human body needs some UV radiation in order for one to maintain adequate vitamin D levels; however, excess exposure produces harmful effects that typically outweigh the benefits.\n",
"Despite the importance of the sun to vitamin D synthesis, it is prudent to limit the exposure of skin to UV radiation from sunlight and from tanning beds. According to the National Toxicology Program Report on Carcinogens from the US Department of Health and Human Services, broad-spectrum UV radiation is a carcinogen whose DNA damage is thought to contribute to most of the estimated 1.5 million skin cancers and the 8,000 deaths due to metastatic melanoma that occur annually in the United States. The use of sunbeds is reported by the World Health Organization to be responsible for over 450,000 cases of non-melanoma skin cancer and over 10,000 cases of melanoma every year in the U.S., Europe, as well as Australia. Lifetime cumulative UV exposure to skin is also responsible for significant age-associated dryness, wrinkling, elastin and collagen damage, freckling, age spots and other cosmetic changes. The American Academy of Dermatology advises that photoprotective measures be taken, including the use of sunscreen, whenever one is exposed to the sun. Short-term over-exposure causes the pain and itching of sunburn, which in extreme cases can produce more-severe effects like blistering.\n",
"Ultraviolet is also responsible for the formation of bone-strengthening vitamin D in most land vertebrates, including humans (specifically, UVB). The UV spectrum thus has effects both beneficial and harmful to human health.\n",
"With the increase of vitamin D synthesis, there is a decreased incidence of conditions that are related to common vitamin D deficiency conditions of people with dark skin pigmentation living in environments of low UV radiation: rickets, osteoporosis, numerous cancer types (including colon and breast cancer), and immune system malfunctioning. Vitamin D promotes the production of cathelicidin, which helps to defend humans' bodies against fungal, bacterial, and viral infections, including flu. When exposed to UVB, the entire exposed area of body’s skin of a relatively light skinned person is able to produce between 10 - 20000 IU of vitamin D.\n",
"The active UVB wavelengths are present in sunlight, and sufficient amounts of cholecalciferol can be produced with moderate exposure of the skin, depending on the strength of the sun. Time of day, season, and altitude affect the strength of the sun, and pollution, cloud cover or glass all reduce the amount of UVB exposure. Exposure of face, arms and legs, averaging 5–30 minutes twice per week, may be sufficient, but the darker the skin, and the weaker the sunlight, the more minutes of exposure are needed. Vitamin D overdose is impossible from UV exposure; the skin reaches an equilibrium where the vitamin degrades as fast as it is created.\n",
"Sun protection is an important aspect of skin care. Though the sun is beneficial in order for the human body to get its daily dose of vitamin D, unprotected excessive sunlight can cause extreme damage to the skin. Ultraviolet (UVA and UVB) radiation in the sun's rays can cause sunburn in varying degrees, early ageing and increased risk of skin cancer. UV exposure can cause patches of uneven skin tone and dry out the skin.\n"
] |
Is there any particular reason why so many people in the United States claim Cherokee ancestry? | Hello. I'm a mod over on /r/IndianCountry, the second largest and most active Native American subreddit. We recently constructed an FAQ [with a section that answers this specific question](_URL_1_) and links to several sources to back it up.
I would like to note, though, that this is more of a social question with a historical context.
In short, according to Gregory D. Smithers, associate professor of history at Virginia Commonwealth University and author of *The Cherokee Diaspora,* the Cherokee adopted a tradition of intermarriage after contact with the Europeans for several reasons, such as increasing diplomatic ties. Because this was actually encouraged by the Cherokee, it isn't *impossible* that those from the geographic location of traditional Cherokee territory have a Cherokee ancestor.
However, another thing to note is that most people don't actually know and just say they have Cherokee in them because it is the family legend.
The same professor mentioned above, Gregory D. Smithers, also states (bold is mine):
> [**"But after their removal, the tribe came to be viewed more romantically,** especially in the antebellum South, where their determination to maintain their rights of self-government against the federal government took on new meaning. Throughout the South in the 1840s and 1850s, **large numbers of whites began claiming they were descended from a Cherokee great-grandmother.** That great-grandmother was often a “princess,” a not-inconsequential detail in a region obsessed with social status and suspicious of outsiders. By claiming a royal Cherokee ancestor, white Southerners were legitimating the antiquity of their native-born status as sons or daughters of the South, as well as establishing their determination to defend their rights against an aggressive federal government, as they imagined the Cherokees had done. These may have been self-serving historical delusions, but they have proven to be enduring."](_URL_0_)
So the reality of things is that people like to claim something even if they don't have exact proof. One reason is the exotic factor of having native blood. That FAQ I linked touches on several other reasons. Point being, while there is some validity to the possibility of one possessing Cherokee blood or an ancestor, most cases are usually false. | [
"Gregory D. Smithers wrote, a large number of Americans belong in this category: \"In 2000, the federal census reported that 729,533 Americans self-identified as Cherokee. By 2010, that number increased, with the Census Bureau reporting that 819,105 Americans claimed at least one Cherokee ancestor.\" By contrast, as of 2012 there were only 330,716 enrolled Cherokee citizens (Cherokee Nation: 288,749; United Keetoowah Band: 14,300; Eastern Band: 14,667). \n",
"Many tribes, especially those in the Eastern United States, are primarily made up of individuals with an unambiguous Native American identity, despite being predominantly of European ancestry. Point in case, more than 75% of those enrolled in the Cherokee Nation have less than one-quarter Cherokee blood and the current Principal Chief of the Cherokee Nation, Bill John Baker, is 1/32 Cherokee, amounting to about 3%.\n",
"Many tribes, especially those in the Eastern United States, are primarily made up of individuals with an unambiguous Native American identity, despite being predominantly of European ancestry. More than 75% of those enrolled in the Cherokee Nation have less than one-quarter Cherokee blood, and the current Principal Chief of the Cherokee Nation, Bill John Baker, is 1/32 Cherokee, amounting to about 3%.\n",
"Cherokee heritage groups are associations, societies and other organizations located primarily in the United States, which are made up of people who may have distant heritage from a Cherokee tribe, or who identify as having such ancestry. Usually such groups consist of persons who do not qualify for enrollment in any of the three, federally recognized, Cherokee tribes (The Cherokee Nation, The Eastern Band of Cherokee Indians, or The United Keetoowah Band of Cherokee Indians). A total of 819,105 Americans claimed Cherokee ancestry in the 2010 Census, more than any other named ancestral tribal group in the Census.\n",
"There have also been cases of mixed-race Cherokee, of partial African ancestry, with as much as 1/4 Cherokee blood (equivalent to one grandparent being full-blood), but who were not listed as \"Cherokee by blood\" in the Dawes Roll because of having been classified only in the Cherokee Freedmen category. Thus such individuals lost their \"blood\" claim to Cherokee citizenship despite having satisfied the criterion of having a close Cherokee ancestor.\n",
"BULLET::::- Cherokees - a Native American tribe indigenous to the Southeastern United States, whose official tribal organization is Cherokee Nation based in Oklahoma, United States, which has 800,000 members as of 2005, and the total ethnic population in the USA nearly doubled to 1.5 million by 2015. However, anthropological and genetic experts in Native American studies have argued that there could be over two million more Cherokee descendants scattered across North America (the largest number at 300-600,000 in California). The beginnings of the Cherokee diaspora was from their forced removal in the \"Trail of Tears\". Later, thousands of \"Americanized\" Cherokee farmers were forced to settle across the Americas (i.e. Canada, Cuba and South America-an estimated 90-100,000 descendants there ) as the result of the Dawes Act. In the 20th century, many Cherokees served in the U.S. Army during World War I, World War II, the Korean War and the Vietnam War. These soldiers left some descendants by intermarriage with \"war brides\" in Europe and east Asia. Some Cherokees and other American Indians might have emigrated to Europe and elsewhere through the British and Spanish empires. They make up the global Cherokee diaspora.\n",
"The work of archaeologists, linguists and anthropologists has confirmed that the Cherokee were descended from prehistoric indigenous peoples of North America. Scholars have concluded that these prehistoric peoples originated from eastern Asia and migrated across the Bering Straits to North America more than 15,000 years ago. Although Payne's theory of Cherokee origins related to Biblical tribes has been replaced by the facts of Asian origin, his unpublished papers are useful to researchers as a rich source of information on the culture of the Cherokee in the early decades of the 19th century.\n"
] |
how does the new iphone voice command system (siri) work? | I don't know the exact details, but I do know that any query made to the system goes to remote servers with the voice command. There, the technology across multiple servers parses your voice to determine exactly what you say (some say the original creators of the voice recognition technology, Nuance, [is still primarily responsible](_URL_1_)).
After that, a completely separate process then parses the words you said to pull out key words and phrases to interpret what exactly you meant and how to resolve your request. Once that process knows what you want, then it's just a matter of calling the right sub-applications with the right arguments. Like setting a reminder at a certain time, calling a certain person, or looking up some query on [Wolfram Alpha](_URL_0_).
The accuracy of the transcription capabilities and Siri's interpretation power is what's cost Apple several million dollars in research and purchases to get Siri where it is now. | [
"Apple added Voice Control to its family of iOS devices as a new feature of iPhone OS 3. The iPhone 4S, iPad 3, iPad Mini 1G, iPad Air, iPad Pro 1G, iPod Touch 5G and later, all come with a more advanced voice assistant called Siri. Voice Control can still be enabled through the Settings menu of newer devices. Siri is a user independent built-in speech recognition feature that allows a user to issue voice commands. With the assistance of Siri a user may issue commands like, send a text message, check the weather, set a reminder, find information, schedule meetings, send an email, find a contact, set an alarm, get directions, track your stocks, set a timer, and ask for examples of sample voice command queries. In addition, Siri works with Bluetooth and wired headphones.\n",
"Voice assistants are interfaces that allow a user to complete an action simply by speaking a command. Introduced in October 2011, Apple’s Siri was one of the first voice assistants widely adopted. Siri allowed users of iPhone to get information and complete actions on their device simply by asking Siri.\n",
"The introduced a new automated voice control system called Siri, that allows the user to give the iPhone commands, which it can execute and respond to. For example, iPhone commands such as \"What is the weather going to be like?\" will generate a response such as \"The weather is to be cloudy and rainy and drop to 54 degrees today.\" These commands can vary greatly and control almost every application of the phone. The commands given do not have to be specific and can be used with natural language. Siri can be accessed by holding down the home button for a short amount of time (compared to using the regular function). An impact of Siri, as shown by Apple video messages, is that it is much easier for people to use device functions while driving, exercising, or when they have their hands full. It also means people with trouble reading, seeing, or typing can access the phone more easily.\n",
"BULLET::::- Speech recognition Google introduced voice input in Android 2.1 in 2009 and voice actions in 2.2 in 2010, with up to five languages (now around 40). Siri was introduced as a system-wide personal assistant on the iPhone 4S in 2011 and now supports nearly 20 languages. In both cases, the voice input is sent to central servers to perform general speech recognition and thus requires a network connection for more than simple commands.\n",
"Interactive voice broadcasting (also referred to as interactive voice messaging) programs allow the call recipient to listen to the recorded message and interact with the system by pressing keys on the phone keypad. The system can detect which key is pressed and be programmed to interact and play various messages accordingly. This is a form of Interactive voice response (IVR).\n",
"In Mac OS X 10.7 Lion and earlier, Apple's speech recognition was voice-command oriented only, i.e. not intended for dictation. It can be configured to listen for commands when a hot key is pressed, after being addressed with an activation phrase such as \"Computer\", or \"Macintosh\", or without prompt. A graphical status monitor, often in the form of an animated character, provides visual and textual feedback about listening status, available commands and actions. It can also communicate back with the user using speech synthesis.\n",
"Voice Control was introduced as an exclusive feature of the iPhone 3GS and allows for the controlling of the phone and music features of the phone by voice. There are two ways to activate Voice Control: hold the Home button while in the home screen for a few seconds; or, change the effect of what double-clicking the home button does so it will activate Voice Control (only on iOS 3.x; on iOS 4 or later, double clicking the Home button opens the multitasking bar).\n"
] |
How livable would 2x the Earth's gravity be? | You might want to check out some discussion we've had here recently on the same topic. [Here](_URL_1_) and [here](_URL_0_). | [
"Gravity on the Earth's surface varies by around 0.7%, from 9.7639 m/s on the Nevado Huascarán mountain in Peru to 9.8337 m/s at the surface of the Arctic Ocean. In large cities, it ranges from 9.7760 in Kuala Lumpur, Mexico City, and Singapore to 9.825 in Oslo and Helsinki.\n",
"The precise strength of Earth's gravity varies depending on location. The nominal \"average\" value at Earth's surface, known as is, by definition, 9.80665 m/s. This quantity is denoted variously as , (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s), , gee, or simply (which is also used for the variable local value). \n",
"Genji is a Super-Earth but only moderately so: it has 2.8 times the mass and 1.36 times the diameter of Earth, and 1.5 times Earth's gravity. The side of the planet that constantly faces its companion world Chujo (\"Moonside\") is mostly land, the other hemisphere (\"Starside\") is mostly ocean. The mean surface temperature is +20 °C, slightly warmer than Earth. Although humans in good condition can physically accommodate to the high gravity, the sea level air pressure of 3.1 bars which results from this gravity (as per the barometric formula) requires artificial decompression for safe breathing. Only at 5,800 meters (an altitude found on this planet only in the form of a few small highlands that are cold and arid) the atmospheric pressure drops to Earth-standard 1 bar.\n",
"It is not yet known whether exposure to high gravity for short periods of time is as beneficial to health as continuous exposure to normal gravity. It is also not known how effective low levels of gravity would be at countering the adverse effects on health of weightlessness. Artificial gravity at 0.1\"g\" and a rotating spacecraft period of 30 s would require a radius of only . Likewise, at a radius of 10 m, a period of just over 6 s would be required to produce standard gravity (at the hips; gravity would be 11% higher at the feet), while 4.5 s would produce 2\"g\". If brief exposure to high gravity can negate the harmful effects of weightlessness, then a small centrifuge could be used as an exercise area.\n",
"The Earth's natural geomagnetic field strength varies over the surface of the planet between 0.035 mT and 0.07 mT (35 µT - 70 µT or 350 mG - 700 mG) while the International Standard for the continuous exposure limit is set at 40 mT (400,000 mG or 400 G) for the general public.\n",
"Near the surface of the Earth, the acceleration due to gravity \"g\" = 9.807 m/s (meters per second squared; which might be thought of as \"meters per second, per second\", or 32.18 ft/s as \"feet per second per second\") approximately. For other planets, multiply \"g\" by the appropriate scaling factor. A coherent set of units for \"g\", \"d\", \"t\" and \"v\" is essential. Assuming SI units, \"g\" is measured in meters per second squared, so \"d\" must be measured in meters, \"t\" in seconds and \"v\" in meters per second. \n",
"Assuming that the Earth is a uniform sphere (which is not correct, but is close enough to get an order-of-magnitude estimate) with \"M\" = 5.97 x 10 kg and \"r\" = 6.37 x 10 m, \"U\" is 2.24 x 10 J. This is roughly equal to one week of the Sun's total energy output. It is 37.5 MJ/kg, 60% of the absolute value of the potential energy per kilogram at the surface.\n"
] |
why are chemical weapons worse than regular ones? is gassing a town worse than bombing it, assuming the number of innocent deaths is the same? | Chemical weapons are worse because:
1) They kill slowly.
2) They are not as controllable as they drift in the air and on the water. This means they cause a lot of collateral damage.
3) They often contaminate and kill those attempting to treat the injured, and they often have very few to no actual treatments that work.
4) They contaminate the environment for a long time killing people years after the attack. There are still some battlefields from WWI that are toxic and make people sick or even kill them when they spend time in them. | [
"The use of poison gas by all major belligerents throughout World War I constituted war crimes as its use violated the 1899 Hague Declaration Concerning Asphyxiating Gases and the 1907 Hague Convention on Land Warfare, which prohibited the use of \"poison or poisoned weapons\" in warfare. Widespread horror and public revulsion at the use of gas and its consequences led to far less use of chemical weapons by combatants during World War II.\n",
"A more sophisticated target-hardening approach must consider industrial and other critical industrial infrastructure that could be attacked. Terrorists need not import chemical weapons if they can cause a major industrial accident such as the Bhopal disaster or the Halifax Explosion. Industrial chemicals in manufacturing, shipping, and storage need greater protection, and some efforts are in progress. To put this risk into perspective, the first used 160 tons of chlorine. Industrial shipments of chlorine, widely used in water purification and the chemical industry, travel in 90 or 55 ton tank cars.\n",
"Fire is considered the third most dangerous hazard, after direct blast effects and fallout radiation. It is noted that during the Bombing of Dresden, \"Most casualties were caused by the inhalation of hot gases and carbon monoxide\"\n",
"The properties of some ignitable liquids make them dangerous fuels. Many ignitable liquids have high vapor pressures, low flash points and a relatively wide range between their upper and lower explosive limit. This allows ignitable liquids to ignite easily, and when mixed in a proper air-fuel ratio, readily explode. Many arsonists who use generous amounts of gasoline have been seriously burned or killed igniting their fire.\n",
"The properties of some ignitable liquids make them dangerous accelerants. Many ignitable liquids have high vapor pressures, low flash points and a relatively wide range between their upper and lower explosive limit. This allows ignitable liquids to ignite easily, and when mixed in a proper air-fuel ratio, readily explode. Many arsonists who use generous amounts of gasoline have been seriously burned or killed igniting their fire.\n",
"Chemical weapons were widely used by all sides during the conflict and wind frequently carried poison gas into nearby towns where civilians did not have access to gas masks or warning systems. An estimated 100,000-260,000 civilian casualties were affected by the use of chemical weapons during the conflict and tens of thousands more died from the effects of such weapons in the years after the conflict ended.\n",
"It is more difficult to determine the toxicity of chemical mixtures than a pure chemical, because each component displays its own toxicity, and components may interact to produce enhanced or diminished effects. Common mixtures include gasoline, cigarette smoke, and industrial waste. Even more complex are situations with more than one type of toxic entity, such as the discharge from a malfunctioning sewage treatment plant, with both chemical and biological agents.\n"
] |
why is it so much louder when you whistle with two fingers? | I can't do that. I just wanted you to know I both envy and respect your ability to whistle with your fingers | [
"Pucker whistling is the most common form in much Western music. Typically, the tongue tip is lowered, often placed behind the lower teeth, and pitch altered by varying the position of the tongue. Although varying the degree of pucker will change the pitch of a pucker whistle, expert pucker whistlers will generally only make small variations to the degree of pucker, due to its tendency to affect purity of tone. Pucker whistling can be done by either only blowing out or blowing in and out alternately. In the 'only blow out' method, a consistent tone is achieved, but a negligible pause has to be taken to breathe in. In the alternating method there is no problem of breathlessness or interruption as breath is taken when one whistles breathing in, but a disadvantage is that many times, the consistency of tone is not maintained, and it fluctuates.\n",
"When split tones occur unintentionally, they are referred to as double buzzing. This phenomenon is widely understood to occur due to fatigue. David Hickman writes \"In most cases, double buzzes occur because of sore or bruised lips. This causes the player to tilt the mouthpiece unconsciously at an abnormal angle to relieve pressure on the sore area. In these cases rest over several days is the best remedy.\"\n",
"Whistling techniques do not require the vibration of the vocal cords: they produce a shock effect of the compressed air stream inside the cavity of the mouth and/or of the hands. When the jaws are fixed by a finger, the size of the hole is stable. The air stream expelled makes vibrations at the edge of the mouth. The faster the air stream is expelled, the higher is the noise inside the cavities. If the hole (mouth) and the cavity (intra-oral volume) are well matched, the resonance is tuned, and the whistle is projected more loudly. The frequency of this bioacoustical phenomenon is modulated by the morphing of the resonating cavity that can be, to a certain extent,\n",
"Clapping hands or snapping one’s fingers whilst standing next to perpendicular sheets of corrugated iron (for example, in a fence) will produce a high-pitched echo with a rapidly falling pitch. This is due to a sequence of echoes from adjacent corrugations. \n",
"Because the clapper strikes the bell as it rising to the mouth upwards position, it rests against the bell's soundbow after the strike, and the peak strike intensity decays away quickly when the clapper helps to dissipate the vibration energy of the bell. This enables rapid successive strikes of multiple bells, such as in change ringing, without excessive overlap and consequent blurring of successive strikes. In addition, the movement of the bell imparts a doppler effect to the sound, as the strike occurs whilst the bell is still moving.\n",
"The cross section of a common whistle is shown in the figure on the right. The cavity is a closed end cylinder ( inch diameter), but with the cylinder axis lateral to the jet axis. The orifice is inch wide and the sharp edge is inch from the jet orifice. When blown weakly, the sound is mostly broad band with a weak tone. When blown more forcefully, a strong tone is established near 2800 Hz and adjacent bands are at least 20 dB down. If the whistle is blown yet more forcefully, the level of the tone increases and the frequency increases only slightly suggesting Class I hydrodynamic feedback and operation only in Stage I.\n",
"BULLET::::- A strident lisp results in a high frequency whistle of hissing sound caused by stream passing between the tongue and the hard surface. In the extensions to the IPA, whistled sibilants are transcribed and .\n"
] |
Would it be possible to use time dilation to travel into the future? | In terms of physics, yes. The technology for that doesn't exist right now though. We can send things at like 20 km/s, and we'd need to go like ten thousand times that fast to start seeing these effects. | [
"Theoretically, time dilation would make it possible for passengers in a fast-moving vehicle to advance further into the future in a short period of their own time. For sufficiently high speeds, the effect is dramatic. For example, one year of travel might correspond to ten years on Earth. Indeed, a constant 1 g acceleration would permit humans to travel through the entire known Universe in one human lifetime.\n",
"Relativistic time dilation allows a traveler to experience time more slowly, the closer his speed is to the speed of light. This apparent slowing becomes noticeable when velocities above 80% of the speed of light are attained. Clocks aboard an interstellar ship would run slower than Earth clocks, so if a ship's engines were capable of continuously generating around 1 g of acceleration (which is comfortable for humans), the ship could reach almost anywhere in the galaxy and return to Earth within 40 years ship-time (see diagram). Upon return, there would be a difference between the time elapsed on the astronaut's ship and the time elapsed on Earth.\n",
"It is uncertain if time travel to the past is physically possible. Forward time travel, outside the usual sense of the perception of time, is an extensively-observed phenomenon and well-understood within the framework of special relativity and general relativity. However, making one body advance or delay more than a few milliseconds compared to another body is not feasible with current technology. As for backwards time travel, it is possible to find solutions in general relativity that allow for it, but the solutions require conditions that may not be physically possible. Traveling to an arbitrary point in spacetime has a very limited support in theoretical physics, and usually only connected with quantum mechanics or wormholes, also known as Einstein-Rosen bridges.\n",
"Manned travel at a speed not close to the speed of light, would require either that we overcome our own mortality with technologies like radical life extension or traveling with a generation ship. If traveling at a speed closer to the speed of light, time dilation would allow intergalactic travel in a timespan of decades of on-ship time.\n",
"Gravitational time dilation is a phenomenon predicted by the theory of General Relativity whereby time passes more slowly in regions of lower gravitational potential. Scientists used the lander to test this hypothesis, by sending radio signals to the lander on Mars, and instructing the lander to send back signals, in cases which sometimes included the signal passing close to the Sun. Scientists found that the observed Shapiro delays of the signals matched the predictions of General Relativity.\n",
"There is a great deal of observable evidence for time dilation in special relativity and gravitational time dilation in general relativity, for example in the famous and easy-to-replicate observation of atmospheric muon decay. The theory of relativity states that the speed of light is invariant for all observers in any frame of reference; that is, it is always the same. Time dilation is a direct consequence of the invariance of the speed of light. Time dilation may be regarded in a limited sense as \"time travel into the future\": a person may use time dilation so that a small amount of proper time passes for them, while a large amount of proper time passes elsewhere. This can be achieved by traveling at relativistic speeds or through the effects of gravity.\n",
"Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light, such as cosmic strings, transversable wormholes, and Alcubierre drive. The theory of general relativity does suggest a scientific basis for the possibility of backward time travel in certain unusual scenarios, although arguments from semiclassical gravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed. These semiclassical arguments led Stephen Hawking to formulate the chronology protection conjecture, suggesting that the fundamental laws of nature prevent time travel, but physicists cannot come to a definite judgment on the issue without a theory of quantum gravity to join quantum mechanics and general relativity into a completely unified theory.\n"
] |
Are there multiple types of Electromagnetic Fields? | > I've seen it described as a "field produced by charged objects", but in other places it sounds more like one continuous thing that extends through all space
The electromagnetic field extends through *all space.* It simply has essentially a zero value away from charges. (though self propagating disruptions can travel without charges—called light) It doesn't have to be zero, the Higgs field for instance has a non-zero expectation value throughout all space.
When we say a charge or magnet generates and EM field, this is short hand for saying they give a nonzero value to regions in a shared universal EM field. It's just very small and close to zero in most places in the universe. | [
"In electromagnetism, the electromagnetic field is generally thought of as being made of two things, the electric field and magnetic field. They are both three-dimensional vector fields, related to each other by Maxwell's equations. A second approach is to combine them in a single object, the six-dimensional electromagnetic tensor, a tensor or bivector valued representation of the electromagnetic field. Using this Maxwell's equations can be condensed from four equations into a particularly compact single equation:\n",
"In Maxwell's theory of electromagnetism, one of the most important types of an electromagnetic field are those representing electromagnetic radiation. Of these, the most important examples are the electromagnetic plane waves, in which the radiation has planar wavefronts moving in a specific direction at the speed of light. Of these, the most basic are the monochromatic plane waves, in which only one frequency component is present. This is precisely the phenomenon which our solution will model in terms of general relativity.\n",
"The most common description of the electromagnetic field uses two three-dimensional vector fields called the electric field and the magnetic field. These vector fields each have a value defined at every point of space and time and are thus often regarded as functions of the space and time coordinates. As such, they are often written as (electric field) and (magnetic field).\n",
"In modern physics, the electromagnetic field is understood to be not a \"classical\" field, but rather a quantum field; it is represented not as a vector of three numbers at each point, but as a vector of three quantum operators at each point. The most accurate modern description of the electromagnetic interaction (and much else) is \"quantum electrodynamics\" (QED), which is incorporated into a more complete theory known as the \"Standard Model of particle physics\".\n",
"There are different mathematical ways of representing the electromagnetic field. The first one views the electric and magnetic fields as three-dimensional vector fields. These vector fields each have a value defined at every point of space and time and are thus often regarded as functions of the space and time coordinates. As such, they are often written as E(x, y, z, t) (electric field) and B(x, y, z, t) (magnetic field).\n",
"There are numerous mathematical descriptions of the electromagnetic field. In classical electrodynamics, electric fields are described as electric potential and electric current. In Faraday's law, magnetic fields are associated with electromagnetic induction and magnetism, and Maxwell's equations describe how electric and magnetic fields are generated and altered by each other and by charges and currents.\n",
"The electromagnetic four-potential is defined to be \"A\" = (-\"φ\", A), and the electromagnetic four-current \"j\" = (-\"ρ\", j). The electromagnetic field at any point in spacetime is described by the antisymmetric (0,2)-rank electromagnetic field tensor\n"
] |
How does salt damage concrete on a molecular level? | Normally the embedded steel in concrete (be it re-bar or welded wire fabric) is protected from corrosion by an effect called passivization caused by the high PH (around 13) of concrete. When water containing dissolved chlorides makes it way to the steel, through the concrete pore structure or more typically cracks, the chlorides negate that passivization and allow the steel to corrode.
When steel corrodes it expands in volume which causes internal tensile stresses in the concrete. Since concrete is very poor in tension it tends to fail which leads to de-lamination of concrete layers and eventually visible spalls (pot holes).
So its really not so much the salt damaging the concrete, but the salt causing corrosion of the embedded steel which causes the damage. Other things, like carbonation, can eliminate the passivization of the rebar, but those mechanisms tend to take much longer.
My instinct is that "drive-way safe" is a buzzword. There are non chloride based de-icing solutions out there, but they are much more expensive and generally not quite as effective.
I am an engineer that is focused on the restoration of concrete parking structures, so this is an area of expertise. | [
"Concrete can be damaged by many processes, such as the expansion of corrosion products of the steel reinforcement bars, freezing of trapped water, fire or radiant heat, aggregate expansion, sea water effects, bacterial corrosion, leaching, erosion by fast-flowing water, physical damage and chemical damage (from carbonatation, chlorides, sulfates and distillate water). The micro fungi Aspergillus Alternaria and Cladosporium were able to grow on samples of concrete used as a radioactive waste barrier in the Chernobyl reactor; leaching aluminum, iron, calcium, and silicon.\n",
"Sulfates in solution in contact with concrete can cause chemical changes to the cement, which can cause significant microstructural effects leading to the weakening of the cement binder (chemical sulfate attack). Sulfate solutions can also cause damage to porous cementitious materials through crystallization and recrystallization (salt attack). Sulfates and sulfites are ubiquitous in the natural environment and are present from many sources, including gypsum (calcium sulfate) often present as an additive in 'blended' cements which include fly ash and other sources of sulfate. With the notable exception of barium sulfate, most sulfates are slightly to highly soluble in water. These include acid rain where sulfur dioxide in the airshed is dissolved in rainfall to produce sulfurous acid. In lightning storms, the dioxide is oxidised to trioxide making the residual sulfuric acid in rainfall even more highly acidic. Local government infrastructure is most commonly corroded by sulfate arising from the oxidation of sulfide which occurs when bacteria (for example in sewer mains) reduce the ever-present hydrogen sulfide gas to a film of sulfide (S-) or bi-sulfide (HS-) ions. This reaction is reversible, both readily oxidising on exposure to air or oxygenated stormwater, to produce sulfite or sulfate ions and acidic hydrogen ions in the reaction HS + HO+ O - 2H + SO-. The corrosion often present in the crown (top) of concrete sewers is directly attributible to this process - known as crown rot corrosion.\n",
"Salt Attack occurs when salts dissolved in water are carried into the stone. The two commonest effects are efflorescence and spalling. Salts that expand on crystallization in capillary gaps can cause surface spalling. For example, various magnesium and calcium salts in sea water expand considerably on drying by taking on water of crystallization. However, even sodium chloride, which does not include water of crystallization, can exert considerable expansive forces as its crystals grow.\n",
"Salt contamination beneath a coating, such as paint on steel, can cause adhesion and corrosion problems due to the hygroscopic nature of salt. Its tendency to attract water through a permeable coating creates a build-up of water molecules between substrate and coating. These molecules, together with salt and other oxidation agents trapped during coating or migrating through the coating, create an electrolytic cell, causing corrosion. Blast cleaning is frequently used to clean surfaces before coating; however, with salt contamination, blast cleaning may increase the problem by forcing salt into the base material. Washing a surface with deionized water before coating is a common solution.\n",
"Acid Attack. Acid-soluble stone materials such as the calcite in marble, limestone and travertine, as well as the internal cement that binds the resistant grains in sandstone, react with acidic solutions on contact, or on absorbing acid-forming gases in polluted air, such as oxides of sulfur or nitrogen. Acid erodes the stone, leaving dull marks on polished surfaces. In time it may cause deep pitting, eventually totally obliterating the forms of statues, memorials and other sculptures. Even mild household acids, including cola, wine, vinegar, lemon juice and milk, can damage vulnerable types of stone. The milder the acid, the longer it takes to etch calcite-based stone; stronger acids can cause irreparable damage in seconds.\n",
"Various types of aggregate undergo chemical reactions in concrete, leading to damaging expansive phenomena. The most common are those containing reactive silica, that can react (in the presence of water) with the alkalis in concrete (KO and NaO, coming principally from cement). Among the more reactive mineral components of some aggregates are opal, chalcedony, flint and strained quartz. Following the alkali-silica reaction (ASR), an expansive gel forms, that creates extensive cracks and damage on structural members. On the surface of concrete pavements the ASR can cause pop-outs, i.e. the expulsion of small cones (up to about in diameter) in correspondence of aggregate particles.\n",
"Concrete degradation may have various causes. Concrete can be damaged by fire, aggregate expansion, sea water effects, bacterial corrosion, calcium leaching, physical damage and chemical damage (from carbonatation, chlorides, sulfates and non-distilled water). This process adversely affects concrete exposed to these damaging stimuli.\n"
] |
how/why does one company make so many different, unrelated products? | It's called "vertical integration" and it's regarded as a smart move because the more a company diversifies its products, the less hurt they are if one product takes a hit (for instance, if they need to recall, or if a competitor comes up with something better, or if a change in the marketplace at large makes the product less desirable -- like if you were selling bread when the Atkins craze hit, it would be nice to also have a sub-brand selling bacon).
[30 Rock had a pretty great moment] (_URL_0_) explaining why some people find this phenomenon a bit worrisome. | [
"In some cases, the original technology supplier did not need to manufacture the product itself—it merely patented a specific design, then sold the actual production rights to multiple overseas clients. This resulted in some countries producing separate but nearly identical products under different licenses. \n",
"BULLET::::- Several different producers exist, with big differences in their production and selling costs, which greatly impacts on the mix design and curing process. This makes each brand very different in potential uses. Even though the different brands may look and feel similar, caution must be used when selecting the versions and brands for specific use since they are not all the same or usable in the same way. [?reference]\n",
"A business using a part will often use a different part number than the various manufacturers of that part do. This is especially common for catalog hardware, because the same or similar part design (say, a screw with a certain standard thread, of a certain length) might be made by many corporations (as opposed to unique part designs, made by only one or a few).\n",
"A company has a product A which is well established within its market. The same company decides to market a product B, which happens to be somewhat similar to product A, therefore both belonging to the same market, attracting similar clients. This leads to both products being forced to share the market, reducing the market share of product A, as part of it is eaten up by product B.\n",
"A ‘Product’ is \"something or anything that can be offered to the customers for attention, acquisition, or consumption and satisfies some want or need.\" (Riaz & Tanveer (n.d); Goi (2011) and Muala & Qurneh (2012)). The product is the primary means of demonstrating how a company differentiates itself from competitive market offerings. The differences can include quality, reputation, product benefits, product features, brand name or packaging.\n",
"The number of different categories of a company is referred to as \"width of product mix\". The total number of products sold in all lines is referred to as \"length of product mix\". If a line of products is sold with the same brand name, this is referred to as family branding. When you add a new product to a line, it is referred to as a \"line extension\". When you have a single saleable item distinguishable by size, appearance, price or some other attribute in your product line, it is called SKU-Stock Keeping Unit.\n",
"The company's products are divided into two lines, with very similar entries but sold toward different audiences. They are marketed through large retail chains, particularly Toys \"R\" Us and Target, as well as Amazon.com.\n"
] |
What are the hazards of Fusion technology? | People discussing fusion reactors usually focus on the use of abundant Deuterium extracted from water as the fuel. While Deuterium would be part of the fuel mix, most of the fusion reactor designs are built around the use of a combined deuterium-tritium fuel source. The ITER reactor for example [will use a 1:1 mix of D-T fuel](_URL_0_). The D-T fusion reaction produces an excess neutron. These neutrons have applications such as producing more tritium for the reactor's fuel, but they will also induce radioactivity in the materials that make up the structure and lining of the reaction chamber. The end result will be the production of nuclear waste - radioactive metals and the like. It will be no where near the volume of radioactive waste produced by fission reactors; but it will be produced none the less. Some designs have also called for the fusion reactor to be used to breed plutonium from the neutrons and U238 lining the reaction chamber. The plutonium would be used to fuel fission based reactors but has the added issue of being a nuclear weapons material - something that could be considered a hazard of the fusion reactor. | [
"The world of \"Fusion\" is centuries in our future, when a series of galactic wars have led to a spiraling arms race between \"tekkers and splicers\" — that is, between those who take a technological and technocratic route to improving humanity, and those who have abandoned humanity altogether through genetic engineering. The story involves the exploits of a group of space mercenaries in an era when humans who have not been enhanced either genetically or cybernetically, are becoming extremely rare.\n",
"In the case of an accident (or sabotage), it is expected that a fusion reactor would release far less radioactive pollution than would an ordinary fission nuclear station. Furthermore, ITER's type of fusion power has little in common with nuclear weapons technology, and does not produce the fissile materials necessary for the construction of a weapon. Proponents note that large-scale fusion power would be able to produce reliable electricity on demand, and with virtually zero pollution (no gaseous CO, SO, or NO by-products are produced).\n",
"Because of EST's claimed lack of need for an external stabilizing magnetic field, EPS hope to be able to create small efficient fusion reactors by colliding magnetically accelerated ESTs together at speeds high enough to induce ballistic nuclear fusion.\n",
"At this time, KMS Fusion was indisputably the most advanced laser-fusion laboratory in the world. Unfortunately, outright harassment from the AEC only increased after the announcement of these results. According to one source in the faculty of the University of Michigan, the campaign against KMS Fusion culminated with a massive incursion into the KMS Fusion facilities by federal agents, who effectively put an end to its operations by confiscating essential materials on the grounds that, inter alia, all information concerning the production of nuclear energy is classified information which belongs exclusively to the federal government.\n",
"KMS Fusion was the only private sector company to pursue controlled thermonuclear fusion research using laser technology. Despite limited resources and numerous business problems KMS successfully demonstrated fusion from the Inertial Confinement Fusion (ICF) process. They achieved compression of a deuterium-tritium pellet from laser-energy in December 1973, and on May 1, 1974 carried out the world’s first successful laser-induced fusion. Neutron-sensitive nuclear emulsion detectors, developed by Nobel Prize winner Robert Hofstadter, were used to provide evidence of this discovery.\n",
"It has been claimed that it is possible to conceive of a crude, deliverable, pure fusion weapon, using only present-day, unclassified technology. The weapon design weighs approximately 3 tonnes, and might have a total yield of approximately 3 tonnes of TNT. The proposed design uses a large explosively pumped flux compression generator to produce the high power density required to ignite the fusion fuel. From the point of view of explosive damage, such a weapon would have no clear advantages over a conventional explosive, but the massive neutron flux could deliver a lethal dose of radiation to humans within a 500-meter radius (most of those fatalities would occur over a period of months, rather than immediately).\n",
"\"Thermonuclear\" fusion is one of the methods being researched in the attempts to produce fusion power. If Thermonuclear fusion becomes favorable to use, it would significantly reduce the world's carbon footprint.\n"
] |
why are space rockets so hard to handle? | You need to look up what they call "the rocket equation".
Lets say you want to throw 10kg into orbit. Orbit speed means you have to accelerate it to something like 9.4 km/s (thats per _second_). Thats pretty fast. To accerlate your 10kg AND your rocket to that speed you need a certain amount of thrust. That means bigger engines, or engines that burn longer both of which requires more fuel. But that fuel has mass that you ALSO have to accelerate so now you have to bring MORE fuel to accelerate the other fuel, but wait the mass you have to accelerate drops as you burn fuel so now you need less fuel to accelerate it..... and now you have a 2nd or 3rd order differential equation.
Now throw in multiple stages (why multiple stages I won't get into), the reserve you need to maybe land your rocket like SpaceX, and you have some hard math. If your payload changes weight at all, you have to recalculate the whole shebang.
As for the control - the aerodynamic forces acting on a rocket that is accelerating to that kind of speed - and before it leaves the atmosphere - are tremendous; and even relatively minute shifts in center of gravity of your rocket (as the fuel gets burned up) or a shift in payload (remember that resupply rocket in The Martian that blew up?) means you have to have control surfaces or nozzle gymbols to constantly adjust the thrust so its through the center of mass or things start tumbling and the forces rip it apart. | [
"Their simplicity also makes solid rockets a good choice whenever large amounts of thrust are needed and the cost is an issue. The Space Shuttle and many other orbital launch vehicles use solid-fueled rockets in their boost stages (solid rocket boosters) for this reason.\n",
"While comparatively inefficient for low speed use, rockets are relatively lightweight and powerful, capable of generating large accelerations and of attaining extremely high speeds with reasonable efficiency. Rockets are not reliant on the atmosphere and work very well in space.\n",
"Larger rockets are normally launched from a launch pad that provides stable support until a few seconds after ignition. Due to their high exhaust velocity——rockets are particularly useful when very high speeds are required, such as orbital speed at approximately . Spacecraft delivered into orbital trajectories become artificial satellites, which are used for many commercial purposes. Indeed, rockets remain the only way to launch spacecraft into orbit and beyond. They are also used to rapidly accelerate spacecraft when they change orbits or de-orbit for landing. Also, a rocket may be used to soften a hard parachute landing immediately before touchdown (see retrorocket).\n",
"Rocket vehicles have a reputation for unreliability and danger; especially catastrophic failures. Contrary to this reputation, carefully designed rockets can be made arbitrarily reliable. In military use, rockets are not unreliable. However, one of the main non-military uses of rockets is for orbital launch. In this application, the premium has typically been placed on minimum weight, and it is difficult to achieve high reliability and low weight simultaneously. In addition, if the number of flights launched is low, there is a very high chance of a design, operations or manufacturing error causing destruction of the vehicle.\n",
"Rockets are used for fireworks, weaponry, ejection seats, launch vehicles for artificial satellites, human spaceflight and exploration of other planets. While comparatively inefficient for low speed use, they are very lightweight and powerful, capable of generating large accelerations and of attaining extremely high speeds with reasonable efficiency.\n",
"A low-propellant space drive has long been a goal for space exploration, since the propellant is dead weight that must be lifted and accelerated with the ship all the way from launch until the moment it is used (see Tsiolkovsky rocket equation). Gravity assists, solar sails, and beam-powered propulsion from a spacecraft-remote location such as the ground or in orbit, are useful because they allow a ship to gain speed without propellant. However, some of these methods do not work in deep space. Shining a light out of the ship provides a small force from radiation pressure, i.e., using photons as a form of propellant, but the force is far too weak, for a given amount of input power, to be useful in practice.\n",
"Rockets are the oldest type and are mainly used when extremely high speeds or extremely high altitudes are needed. Due to the extreme, typically hypersonic, exhaust velocity and the necessity of oxidiser being carried on board, they consume propellant extremely quickly. For this reason, they are not practical for routine transportation.\n"
] |
What methods were used to estimate the population of pre-columbian America? How reliable were they? | There were a number of methods used that resulted in widely varying estimates. Charles Mann provides a brief but thorough discussion of methods used to estimate pre-contact populations in the new world in "1491: New Revelations of the Americas before Columbus" (Vintage, 2011). Some researchers used early records archived in church and governmental facilities then attempted to correct for population crashes caused by the plagues. Others based their estimates on number of households and estimated household size. Sherburne Cook was among the more prolific students of prehistoric populations publishing papers from the 1950s to the 1970s. In the mid 1970s there was an American Antiquity memoir published that employed assumed initial population estimates from skeletal populations (usually from excavated cemeteries) then applied estimated fertility and mortality estimates and extrapolated from there. Kroeber, in the "Handbook of the Indians of California" (1970, California Book Co) employed house and house pit numbers from early ethnographic surveys. Baumhoff (1958) in California Athabaskan Groups (University of California Anthropological Reports, Berkeley) developed population estimates for Northern California tribes based on the availability of fish resources.
All have their merits and their shortcomings. Mann notes that Henige in "Numbers from Nowhere: The American Indian Contact Population Debate" (1998: Univ.. of Oklahoma Press) is the pinnacle of vilification of indigenous population estimates and estimators.
This is a tiny sample of the reams of population studies that have been conducted. They all seem to have the same basic problems: the veracity of the basis for original estimates (censuses, house counts, fish populations and skeletal counts) and the estimated impacts of the plagues. The issue is further complicated by the bias of researchers and readers. Some tend to maximize the estimates others are much more conservative. | [
"Given the fragmentary nature of the evidence, even semi-accurate pre-Columbian population figures are impossible to obtain. Scholars have varied widely on the estimated size of the indigenous populations prior to colonization and on the effects of European contact. Estimates are made by extrapolations from small bits of data. In 1976, geographer William Denevan used the existing estimates to derive a \"consensus count\" of about 54 million people. Nonetheless, more recent estimates still range widely.\n",
"Estimates of the pre-Columbian population of what today constitutes the U.S. vary significantly, ranging from William M Denevan's 3.8 million in his 1992 work \"The Native Population of the Americas in 1492\", to 18 million in Henry F Dobyns's \"Their Number Become Thinned\" (1983). Henry F Dobyns' work, being the highest single point estimate by far within the realm of professional academic research on the topic, has been criticized for being \"politically motivated\". Perhaps Dobyns' most vehement critic is David Henige, a bibliographer of Africana at the University of Wisconsin, whose \"Numbers From Nowhere\" (1998) is described as \"a landmark in the literature of demographic fulmination\". \"Suspect in 1966, it is no less suspect nowadays,\" Henige wrote of Dobyns's work. \"If anything, it is worse.\"\n",
"In his book \"The Native Population of the Americas in 1492\" (1976), he provided an influential estimate of the Pre-Columbian population of the Americas, which he placed at 57.3 million, plus or minus 25 percent. The second edition (1992), after reviewing more recent literature, he revised his estimate to 54 million.\n",
"When considering population estimates by world region, it is worth noting that population history of the indigenous peoples of the Americas before the 1492 voyage of Christopher Columbus has proven difficult to establish, with many historians arguing for an estimate of 50 million people throughout the Americas, and some estimating that populations may have reached 100 million people or more. It is therefore estimated by some that populations in Mexico, Central, and South America could have reached 37 million by 1492. Additionally, the population estimate of 2 million for North America for the same time period represents the low end of modern estimates, and some estimate the population to have been as high as 18 million.\n",
"Studies in American Demography is a 1940 book, written by Walter F. Willcox and published by Cornell University Press. It was one of the first publications to estimate the world population had exceeded 1 billion people in 1800.\n",
"Estimating the number of Native Americans living in what is today the United States of America before the arrival of the European explorers and settlers has been the subject of much debate. While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from a low of 2.1 million (Ubelaker 1976) to 7 million people (Russell Thornton) to a high of 18 million (Dobyns 1983). A low estimate of around 1 million was first posited by the anthropologist James Mooney in the 1890s, by calculating population density of each culture area based on its carrying capacity.\n",
"The population figure of indigenous peoples of the Americas before the 1492 Spanish voyage of Christopher Columbus has proven difficult to establish. Scholars rely on archaeological data and written records from European settlers. Most scholars writing at the end of the 19th century estimated that the pre-Columbian population was as low as 10 million; by the end of the 20th century most scholars gravitated to a middle estimate of around 50 million, with some historians arguing for an estimate of 200 million or more. Contact with the Europeans led to the European colonization of the Americas, in which millions of immigrants from Europe eventually settled in the Americas.\n"
] |
how do dual sim phones work | A [dual SIM](_URL_1_) phone can hold / use 2 [SIM cards](_URL_0_).
The SIM card holds an identifying (hardware) number that identifies the phone, so you can set up a subscription and associate the SIM number with a phone number.
So dual SIM phones can answer/handle two separate phone numbers. These can be on the same provider (Verizon for example) or on different providers (one Verizon one AT & T). Popular with business persons; they can have a single phone device, but a personal number and an official business number on it. | [
"Dual SIM refers to mobile phones that support use of multiple SIM cards. When a second SIM card is installed, the phone either allows users to switch between two separate mobile network services manually, has hardware support for keeping both connections in a \"standby\" state for automatic switching, or has individual transceivers for maintaining both network connections at once.\n",
"Most dual mode handsets require two identifying cards (one SIM and one RUIM), though some dual-mode phones (for example, the iPhone 4S) only require one SIM and one ESN. Not all dual SIM handsets are dual mode (for example dual SIM GSM phones).\n",
"Dual SIM phones are mainstream in many countries where phones are normally sold unlocked. Dual SIMs are popular for separating personal and business calls in locations where lower prices apply to calls between clients of the same provider, where a single network may lack comprehensive coverage, and for travel across national and regional borders. In countries where dual SIM phones are the norm, people who require only one SIM simply leave the second SIM slot empty. \n",
"Dual-SIM devices have two SIM card slots for the use of two SIM cards, from one or multiple carriers. Dual-SIM mobile phones come with two slots for SIMs in various locations such as: one behind the battery and another on the side of the phone; both slots behind the battery; or on the side of the phone if the device does not have a removable battery. Multiple-SIM devices are commonplace in developing markets such as in Africa, East Asia, the Indian subcontinent and Southeast Asia, where variable billing rates, network coverage and speed make it desirable for consumers to use multiple SIMs from competing networks. Dual SIM phones are also useful to separate one's personal phone number from a business phone number, without having to carry multiple devices. Some popular devices, such as the BlackBerry KeyOne have dual-SIM variants, however dual-SIM devices are not common in the US or Europe due to lack of demand.\n",
"Dual SIM switch phones, such as the Nokia C1-00, are effectively a single SIM device as both SIMs share the same radio, and thus are only able to place or receive calls and messages on one SIM at the time. They do, however, have the added benefit of alternating between cards when necessary.\n",
"Multi-SIM allows switching among (up to) 12 stored numbers from the phone's main menu. A new menu entry in subscriber’s phone automatically appears after inserting the multi-SIM card into the cell phone.\n",
"In their marketing materials Samsung use the term \"Dual SIM Always on” to describe the Duos phones, although technically the term is misleading, since it does not mean quite what is says – both SIM cards are not always on. All phones with this feature are regular Dual SIM Stand-by (DSS) phones with 1 transceiver (radio) – 2nd SIM is always connected when a call is in progress on SIM 1 and vice versa.\n"
] |
What was happening pre World War 1? | Here's some answers I've given previously on the subject
[The Balkan Wars] (_URL_1_)
[Lead up to and outbreak of WWI] (_URL_2_)
[Balkan Nationalism and the Outbreak of WWI] (_URL_0_)
The 1890s saw the formation of the Triple Alliance (Germany, Austro-Hungary, Italy), the formation of the Franco-Russian and Franco-British Ententes, and the Anglo-German Naval Arms Race began.
The early 1900s saw the First and Second Moroccan Crises, the Bosnia Crisis, the First and Second Balkan Wars and the Scutari Crisis. It saw the beginning of a Land Arms Race in 1912, starting with Russia, then Germany and France.
There was growing tension. Germany's pointlessly aggressive stance in Morocco, combined with the naval arms race, alienated the British, and drew them closer to France, while events in the Balkans lead to increasing Austro-Russian antagonism.
However, considering the lengthy affairs these crises were, and the important issues at stake, few civilian and even political observers believed that an assassination in Sarajevo could possibly lead to war. The pace of events in the July Crisis was much greater than in previous crises, and so decision makers found themselves under greater pressure. | [
"In 1914, the First World War broke out. For the next four years fighting raged across Europe, the Middle East, Africa, and Asia. On 8 January 1918, United States President Woodrow Wilson issued a statement that became known as the Fourteen Points. In part, this speech called for Germany to withdraw from the territory it had occupied and for the formation of a League of Nations. During the fourth quarter of 1918, the Central Powers began to collapse. In particular, the German military was decisively defeated on the Western Front and the German navy mutinied, prompting domestic uprisings that became known as the German Revolution.\n",
"World War I was a significant turning point in the political, cultural, economic, and social climate of the world. It is considered to mark the end of the Second Industrial Revolution and the \"Pax Britannica\". The war and its immediate aftermath sparked numerous revolutions and uprisings. The Big Four (Britain, France, the United States, and Italy) imposed their terms on the defeated powers in a series of treaties agreed at the 1919 Paris Peace Conference, the most well known being the German peace treaty—the Treaty of Versailles. Ultimately, as a result of the war the Austro-Hungarian, German, Ottoman, and Russian Empires ceased to exist, with numerous new states created from their remains. However, despite the conclusive Allied victory (and the creation of the League of Nations during the Peace Conference, intended to prevent future wars), a second world war would follow just over twenty years later.\n",
"There were several main causes of World War I, which broke out unexpectedly in June–August 1914, including the conflicts and hostility of the previous four decades. Militarism, alliances, imperialism, and ethnic nationalism played major roles. However the immediate origins of the war lay in the decisions taken by statesmen and generals during the July Crisis of 1914, which was sparked by the assassination of Archduke Franz Ferdinand, heir to the throne of Austria-Hungary, by a Serbian secret organization, the Black Hand.\n",
"World War I (also known as the First World War and the Great War) was a global military conflict that embroiled most of the world's great powers, assembled in two opposing alliances: the Entente and the Central Powers. The immediate cause of the war was the June 28, 1914 assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, by Gavrilo Princip, a Bosnian Serb citizen of Austria–Hungary and member of the Black Hand. The retaliation by Austria–Hungary against Serbia activated a series of alliances that set off a chain reaction of war declarations. Within a month, much of Europe was in a state of open warfare, resulting in the mobilization of more than 65 million European soldiers, and more than 40 million casualties—including approximately 20 million deaths by the end of the war.\n",
"World War I broke out in July 1914, pitting the Central Powers (Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria) against the Allied Powers (Britain, France, Russia, Serbia, and several other countries). The war fell into a long stalemate after the Allied Powers halted the German advance at the September 1914 First Battle of the Marne. Wilson and House sought to position the United States as a mediator in the conflict, but European leaders rejected Houses's offers to help end the conflict. From 1914 until early 1917, Wilson's primary foreign policy objective was to keep the United States out of the war in Europe. He insisted that all government actions be neutral, stating that the United States \"must be impartial in thought as well as in action, must put a curb upon our sentiments as well as upon every transaction that might be construed as a preference of one party to the struggle before another.\" The United States sought to trade with both the Allied Powers and the Central Powers, but the British imposed a blockade of Germany. After a period of negotiations, Wilson essentially assented to the British blockade; the U.S. had relatively little direct trade with the Central Powers, and Wilson was unwilling to wage war against Britain over trade issues.\n",
"The outbreak of the First World War in 1914 was precipitated by the rise of nationalism in Southeastern Europe as the Great Powers took sides. The 1917 October Revolution led the Russian Empire to become the world's first communist state, the Soviet Union. The Allies, led by Britain, France, and the United States, defeated the Central Powers, led by the German Empire and Austria-Hungary, in 1918. During the Paris Peace Conference the Big Four imposed their terms in a series of treaties, especially the Treaty of Versailles. The war's human and material devastation was unprecedented.\n",
"1917–1918: World War I: On April 6, 1917, the United States declared war with Germany and on December 7, 1917, with Austria-Hungary. Entrance of the United States into the war was precipitated by Germany's submarine warfare against neutral shipping and the Zimmermann Telegram.\n"
] |
What percentage of new immigrants learned "fluent" English in the 19th century? | To which country? | [
"Before the arrival of the British, the official language for hundreds of years, and one of the educated elite had been Italian, but this was downgraded by the increased use of English. In 1934, English and Maltese were declared the sole official languages. That year only about 15% of the population could speak Italian fluently. This meant that out of 58,000 males qualified by age to be jurors, only 767 could qualify by language, as only Italian had until then been used in the courts.\n",
"Cultural similarities and a common language allowed English immigrants to integrate rapidly and gave rise to a unique Anglo-American culture. An estimated 3.5 million English immigrated to the U.S. after 1776. English settlers provided a steady and substantial influx throughout the 19th century. \n",
"More than 89 percent of residents identified English as their first language at the time of the 2006 census, while 6 percent identified German and just over 1 percent each identified Spanish and French as their first language learned. The next most common languages were Ukrainian, Chinese, Dutch, and Polish.\n",
"As of 2000, speakers of English as a first language accounted for 90.60% of all residents, while those who spoke Spanish made up 4.13%, Tagalog 1.00%, French 0.47%, Arabic 0.44%, German 0.43%, Vietnamese at 0.31%, Russian was 0.21% and Italian made up 0.17% of the population.\n",
"As of 2000, speakers of English as a first language accounted for 78.52% of the population, while Spanish was at 9.37%, French Creole at 7.13%, French at 2.31%, Italian at 1.22%, as well as Portuguese being at 0.68%, German being 0.55%, and Polish as a mother tongue of 0.17% of all residents.\n",
"As of 2000, speakers of English as their first language were 89.18%, while 4.64% spoke Spanish as theirs. Other languages spoken as a first language are Italian 1.93%, French 1.22%, German at 1.06%, and Portuguese at 0.71%.\n",
"As of 2000, English as a first language accounted for 77.57% of all residents, while Spanish accounted for 15.49%, French Creole made up 3.11%, Yiddish totaled 1.55%, both Arabic and German were at 0.77%, and Italian was the mother tongue for 0.69% of the population.\n"
] |
why does the uk require citizens to register to vote? why not automatically enroll people when they receive their national insurance number? | You need to be registered at an address so they know which constituency you are in so your vote can be cast in the right place. If they didn't voting would be chaotic and it would be difficult to detect fraud. | [
"Within the jurisdiction of the United Kingdom, the right to register for voting extends to all British, Irish, Commonwealth and European Union citizens. British citizens living overseas may register for up to 15 years after they were last registered at an address in the UK. Citizens of the European Union (who are not Commonwealth citizens or Irish citizens) can vote in European and local elections in the UK, elections to the Scottish Parliament and Welsh and Northern Ireland Assemblies (if they live in those areas) and some referendums (based on the rules for the particular referendum); they are not able to vote in UK Parliamentary general elections. It is possible for someone to register before their 18th birthday as long as they will reach that age before the next revision of the register.\n",
"Voter registration in the United States is an independent responsibility, so citizens choose whether they want to register or not. This led to only 64% of the voting age population being registered to vote in 2016. The United States is one of the sole countries that requires its citizens to register separately from voting. The lack of automatic registration contributes to the issue that there are over a third of eligible citizen in the United States that are not registered to vote.\n",
"In the United Kingdom, voter registration was introduced for all constituencies as a result of the Reform Act 1832, which took effect for the election of the same year. Since 1832, only those registered to vote can do so, and the government invariably runs nonpartisan get out the vote campaigns for each election to expand the franchise as much as possible.\n",
"(CN and EU member) In the United Kingdom, full voting rights and rights to stand as a candidate are given to citizens of Ireland and to \"qualifying\" citizens of Commonwealth countries; this is because they are not regarded in law as foreigners. This is a legacy of the situation that existed before 1983 where they had the status of British subjects.\n",
"Crown servants and British Council employees (as well as their spouses who live abroad) employed in a post outside the UK can register by making a Crown Servant declaration, allowing them to vote in all UK elections.\n",
"Recently discharged Uniformed Service members and their accompanying families or overseas citizens returning to the United States may become residents of a state just before an election, but not in time to register by the state's deadline and vote. The adoption of special procedures for late registration would allow these citizens to register and vote in the upcoming election.\n",
"The Representation of the People Acts 1983 and 2000 confer the franchise on British subjects and citizens of the Commonwealth and Ireland who are resident in the UK. In addition, nationals of other Member States of the European Union have the right to vote in local elections and elections to the European Parliament. The right to vote also includes the right to a secret ballot and the right to stand as a candidate in elections. Certain persons are excluded from participation including peers, aliens, infants, persons of unsound mind, holders of judicial office, civil servants, members of the regular armed forces or police, members of any non-Commonwealth legislature, members of various commissions, boards and tribunals, persons imprisoned for more than one year, bankrupts and persons convicted of corrupt or illegal election practices. The restriction on the participation of clergy was removed by the House of Commons (Removal of Clergy Disqualification) Act 2001.\n"
] |
how does facebook "share bait" work. what are the spammers getting out of getting it? | Money. The more people you can attract to your facebook page/website the more money you can get out of ads.
Plus if you have some bad intentions you can try to infect the user when he visits your website, which is mostly equal to money. | [
"Using Facebook, Tinder is able to build a user profile with photos that have already been uploaded. Basic information is gathered and the users' social graph is analyzed. Candidates who are most likely to be compatible based on geographical location, number of mutual friends, and common interests are streamed into a list of matches. Based on the results of potential candidates, the app allows the user to anonymously like another user by swiping right or pass by swiping left on them. If two users like each other it then results in a \"match\" and they are able to chat within the app. The app is used in about 196 countries.\n",
"Video sharing sites, such as YouTube, are now frequently targeted by spammers. The most common technique involves spammers (or spambots) posting links to sites, on the comments section of random videos or user profiles. With the addition of a \"thumbs up/thumbs down\" feature, groups of spambots may constantly \"thumbs up\" a comment, getting it into the top comments section and making the message more visible.\n",
"Facebook and Twitter are not immune to messages containing spam links. Spammers hack into accounts and send false links under the guise of a user's trusted contacts such as friends and family. As for Twitter, spammers gain credibility by following verified accounts such as that of Lady Gaga; when that account owner follows the spammer back, it legitimizes the spammer.\n",
"Social networking spam is spam directed specifically at users of internet social networking services such as Google+, Facebook, Pinterest, LinkedIn, or MySpace. Experts estimate that as many as 40% of social network accounts are used for spam. These spammers can utilize the social network's search tools to target certain demographic segments, or use common fan pages or groups to send notes from fraudulent accounts. Such notes may include embedded links to pornographic or other product sites designed to sell something. In response to this, many social networks have included a \"report spam/abuse\" button or address to contact. Spammers, however, frequently change their address from one throw-away account to another, and are thus hard to track.\n",
"Spamming on online social networks is quite prevalent. A primary motivation to spam arises from the fact that a user advertising a brand would like others to see them and they typically publicize their brand over the social network. Detecting such spamming activity has been well studied by developing a semi-automated model to detect spams. For instance, text mining techniques are leveraged to detect regular activity of spamming which reduces the viewership and brings down the reputation (or credibility) of a public pages maintained over Facebook. In some online social networks like Twitter, users have evolved mechanisms to report spammers which has been studied and analyzed.\n",
"Po.st is a social sharing platform for web users and website publishers to share content on social media such as Facebook, Twitter, and StumbleUpon, among others. the product also includes a link shortener built to provide brands with insights on clicking users, therefore segmenting them for paid media targeting. This provides marketers information regarding what content is being copied and pasted into an email or on social media, so-called \"dark social\" channels.\n",
"Malicious chatbots are frequently used to fill chat rooms with spam and advertisements, by mimicking human behavior and conversations or to entice people into revealing personal information, such as bank account numbers. They are commonly found on Yahoo! Messenger, Windows Live Messenger, AOL Instant Messenger and other instant messaging protocols. There has also been a published report of a chatbot used in a fake personal ad on a dating service's website.\n"
] |
How was the first Operating System made when there were no computers to make it on? | Our modern notion of computer didn't arise suddenly well-formed from theoretical concepts. In fact, the entire idea of operating system isn't necessary for a computer to work at all (and most microcontrollers don't run one).
To start with, what exactly is an operating system? Well, it's hard to pinpoint one or two defining characteristics, but most operating systems exist to perform two distinct functions: abstracting the details of the underlying hardware resources so application programmers (the people who write stuff like office suites) don't have to worry about them; and managing those resources. So you can see a computer could just be programmed directly over the hardware without an operating system; you can program wherever you want, as long as you have a way of transferring your instructions to some storage medium the computer understands. Actually, most early computers had no storage at all, and had to be programmed directly by plugging up thousands cables and switches in huge control panels!
The situation improved a little with the introduction of punched cards (early 1950s) to replace these panels, but everything remained more or less the same until the introduction and commercial viability of the transistor (later 1950s). With the advent of reliable and mass-produced computers started a phenomenon of role separation, where the programmers were no longer operators who were no longer maintainers. To share these very expensive computers between users, people came up with ways to time-share their punched cards, which led to the creation of batch systems. These involved one machine to read the cards and write them onto magnetic tape, people to take the tape to the main computer, and another machine to print the results from the output tape onto human-readable paper.
Modern operating systems appeared with the increasing automation of this tedious and error-prone process, with more and more features becoming incorporated into the actual computer and programmers having to know less and less about the actual hardware they were using. IBM's OS/360 was the first operating system where you pretty much only had to know you were running an IBM 360 to work, and the trend continues into our days.
So you see there we didn't create an operating system in one fell swoop to run on the Analytical Engine or valve-based computers, but instead they evolved as a natural consequence of our eternal desire to do less and less work to get more and more results out of our tools. Some of our current terminology regarding operating systems still betrays their historical origins, in fact. | [
"Early computers were built to perform a series of single tasks, like a calculator. Basic operating system features were developed in the 1950s, such as resident monitor functions that could automatically run different programs in succession to speed up processing. Operating systems did not exist in their modern and more complex forms until the early 1960s. Hardware features were added, that enabled use of runtime libraries, interrupts, and parallel processing. When personal computers became popular in the 1980s, operating systems were made for them similar in concept to those used on larger computers.\n",
"The first operating system used for real work was GM-NAA I/O, produced in 1956 by General Motors' Research division for its IBM 704. Most other early operating systems for IBM mainframes were also produced by customers.\n",
"Early operating systems were very diverse, with each vendor or customer producing one or more operating systems specific to their particular mainframe computer. Every operating system, even from the same vendor, could have radically different models of commands, operating procedures, and such facilities as debugging aids. Typically, each time the manufacturer brought out a new machine, there would be a new operating system, and most applications would have to be manually adjusted, recompiled, and retested.\n",
"Computer operating systems (OSes) provide a set of functions needed and used by most application programs on a computer, and the links needed to control and synchronize computer hardware. On the first computers, with no operating system, every program needed the full hardware specification to run correctly and perform standard tasks, and its own drivers for peripheral devices like printers and punched paper card readers. The growing complexity of hardware and application programs eventually made operating systems a necessity for everyday use.\n",
"In 1977 the first commercially produced personal computers were invented in the US: the Apple II, the PET 2001 and the TRS-80. They were quickly made available in Canada. In 1980 IBM introduced the IBM PC. Microsoft provided the operating system, through IBM, where it was referred to as PC DOS and as a stand-alone product known as MS-DOS. This created a rivalry for personal computer operating systems, Apple and Microsoft, which endures to this day. A large variety of special-use software and applications have been developed for use with these operating systems. There have also been a multiplicity of hardware manufacturers which have produced a wide variety of personal computers, and the heart of these machines, the central processing unit, has increased in speed and capacity by leaps and bounds. There were 1,560,000 personal computers in Canada by 1987, of which 650,000 were in homes, 610,000 in businesses and 300,000 in educational institutions. Canadian producers of micro-computers included Sidus Systems, 3D Microcomputers, Seanix Technology and MDG Computers. Of note is the fact that these machines were based on digital technology, and their widespread and rapid introduction to Canada at the same time that the telephone system was undergoing a similar transformation would herald an era of rapid technological advance in the field of communication and computing.\n",
"Early computers such as the ENIAC had to be physically rewired to perform different tasks, which caused these machines to be called \"fixed-program computers\". Since the term \"CPU\" is generally defined as a device for software (computer program) execution, the earliest devices that could rightly be called CPUs came with the advent of the stored-program computer.\n",
"IBM initially sold its computers without any software, expecting customers to write their own; programs were manually initiated, one at a time. Later, IBM provided compilers for the newly developed higher-level programming languages Fortran, COMTRAN and later COBOL. The first operating systems for IBM computers were written by IBM customers who did not wish to have their very expensive machines ($2M USD in the mid-1950s) sitting idle while operators set up jobs manually. These first operating systems were essentially scheduled work queues. It is generally thought that the first operating system used for real work was GM-NAA I/O, produced by General Motors' Research division in 1956. IBM enhanced one of GM-NAA I/O's successors, the SHARE Operating System, and provided it to customers under the name IBSYS. As software became more complex and important, the cost of supporting it on so many different designs became burdensome, and this was one of the factors which led IBM to develop System/360 and its operating systems.\n"
] |
since cellphones are here to stay and commercial flight is here to stay, why haven't they figured out how to make it so we can keep our phones on. | You *can* have them on. You can't use them as a phone.
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One, cell towers aren't designed for phones 30,000 feet in the air that can hit multiple towers.
Two, on a long flight having people babbling on phones would cause some passengers to politely invite others to step outside. | [
"In Europe, regulations and technology have allowed the limited introduction of the use of passenger mobile phones on some commercial flights, and elsewhere in the world many airlines are moving towards allowing mobile phone use in flight. Many airlines still do not allow the use of mobile phones on aircraft. Those that do often ban the use of mobile phones during take-off and landing.\n",
"that the calls reached their destinations. Marvin Sirbu, professor of Engineering and Public Policy at Carnegie Mellon University said on September 14, 2001, that \"The fact of the matter is that cell phones can work in almost all phases of a commercial flight.\" Other industry experts said that it is possible to use cell phones with varying degrees of success during the ascent and descent of commercial airline flights.\n",
"Mobile phone use on aircraft is starting to be allowed with several airlines already offering the ability to use phones during flights. Mobile phone use during flights used to be prohibited and many airlines still claim in their in-plane announcements that this prohibition is due to possible interference with aircraft radio communications. Shut-off mobile phones do not interfere with aircraft avionics. The recommendation why phones should not be used during take-off and landing, even on planes that allow calls or messaging, is so that passengers pay attention to the crew for any possible accident situations, as most aircraft accidents happen on take-off and landing.\n",
"The U.S. Federal Communications Commission (FCC) currently prohibits the use of mobile phones aboard \"any\" aircraft in flight. The reason given is that cell phone systems depend on frequency reuse, which allows for a dramatic increase in the number of customers that can be served within a geographic area on a limited amount of radio spectrum, and operating a phone at an altitude may violate the fundamental assumptions that allow channel reuse to work.\n",
"On 31 October 2013, the FAA issued a press release entitled \"FAA to Allow Airlines to Expand Use of Personal Electronics\" in which it announced that \"airlines can safely expand passenger use of Portable Electronic Devices (PEDs) during all phases of flight.\" This new policy does not include cell phone use in flight, because, as the press release states, \"The FAA did not consider changing the regulations regarding the use of cell phones for voice communications during flight because the issue is under the jurisdiction of the Federal Communications Commission (FCC).\"\n",
"Some airlines have installed technologies to allow phones to be connected within the airplane as it flies. Such systems were tested on scheduled flights from 2006 and in 2008 several airlines started to allow in-flight use of mobile phones.\n",
"Many people may prefer a ban on mobile phone use in flight as it prevents undue amounts of noise from mobile phone chatter. AT&T has suggested that in-flight mobile phone restrictions should remain in place in the interests of reducing the nuisance to other passengers caused by someone talking on a mobile phone near them.\n"
] |
why do people shiver when they are using all of their strength? | They aren't actually shivering. Their muscles are rapidly changing the fibers they use to balance and lift the load. One set of fibers is doing the majority of the lifting while the other set relax slightly then they switch positions creating the illusion of shivering. This switching can happen upwards of several thousand times per minute. | [
"Shivering (also called shaking) is a bodily function in response to cold in warm-blooded animals. When the core body temperature drops, the shivering reflex is triggered to maintain homeostasis. Skeletal muscles begin to shake in small movements, creating warmth by expending energy. Shivering can also be a response to a fever, as a person may feel cold. During fever the hypothalamic set point for temperature is raised. The increased set point causes the body temperature to rise (pyrexia), but also makes the patient feel cold until the new set point is reached. Severe chills with violent shivering are called rigors. Rigors occur because the patient's body is shivering in a physiological attempt to increase body temperature to the new set point.\n",
"Shivers, or equine shivering, is a rare, progressive neuromuscular disorder of horses. It is characterized by muscle tremors, difficulty holding up the hind limbs, and an unusual gait when the horse is asked to move backwards. Shivers is poorly understood and no effective treatment is available at this time.\n",
"There has yet to be any peer-reviewed research on the topic. The most plausible theory, is that the shiver is a result of the autonomic nervous system (ANS) getting its signals mixed up between its two main divisions:\n",
"In mild cases, shivers may present only when the horse is asked to move backwards, usually seen as trembling in the muscles of the hind limbs and sudden, upward jerks of the tail. Affected animals may also snatch up their foot when asked to lift it for cleaning.\n",
"Prior to the induction of targeted temperature management, pharmacological agents to control shivering must be administered. When body temperature drops below a certain threshold—typically around —people may begin to shiver. It appears that regardless of the technique used to induce hypothermia, people begin to shiver when temperature drops below this threshold. Drugs commonly used to prevent and treat shivering in targeted temperature management include acetaminophen, buspirone, opioids including pethidine (meperidine), dexmedetomidine, fentanyl, and/or propofol. If shivering is unable to be controlled with these drugs, patients are often placed under general anesthesia and/or are given paralytic medication like vecuronium. People should be rewarmed slowly and steadily in order to avoid harmful spikes in intracranial pressure.\n",
"This induction works because shaking hands is one of the actions learned and operated as a single \"chunk\" of behavior; tying shoelaces is another classic example. If the behavior is diverted or frozen midway, the person literally has no mental space for this - he is stopped in the middle of unconsciously executing a behavior that hasn't got a \"middle\". The mind responds by suspending itself in trance until either something happens to give a new direction, or it \"snaps out\". A skilled hypnotist can often use that momentary confusion and suspension of normal processes to induce trance quickly and easily.\n",
"BULLET::::- Muscles can also receive messages from the thermoregulatory center of the brain (the hypothalamus) to cause shivering. This increases heat production as respiration is an exothermic reaction in muscle cells. Shivering is more effective than exercise at producing heat because the animal (includes humans) remains still. This means that less heat is lost to the environment through convection. There are two types of shivering: low-intensity and high-intensity. During low-intensity shivering, animals shiver constantly at a low level for months during cold conditions. During high-intensity shivering, animals shiver violently for a relatively short time. Both processes consume energy, however high-intensity shivering uses glucose as a fuel source and low-intensity tends to use fats. This is a primary reason why animals store up food in the winter.\n"
] |
why does our brain get attached to people, things, places etc, and why do we have a strong need to find the one we love | Probably all to do with our survival instincts. We can get attached to places as a way to demonstrate that it's "our area", and to produce offspring we adore the person that is deemed by our brain as the best mate, for healthier and stronger children. This is my biased idea, so take it for what it is. | [
"Unable to explain the unique circumstances in which they acquired their knowledge, they both have difficulty convincing their friends that they know what is the right thing to do. Neither is able to completely dissociate themselves from the things that were once important to them, and they realize that by not concentrating on their love they might be sacrificing their second chance at life.\n",
"In \"Living a connected life\" (2003), Dr. Kathleen Brehony looks at recent brain research which shows the importance of proximity of others in our development. \"Especially in infancy, but throughout our lives, our physical bodies are influencing and being influenced by others with whom we feel a connection. Scientists call this \"limbic regulation.\"\"\n",
"Because of the interconnectedness of the universe by virtue of Space-Time, and because the mind apprehends space, time and motion through a unity of sense and mind experience, there is a form of knowing that is intuitive (participative) - sense and reason are outgrowths from it.\n",
"Mind-Set People tend to focus more on what they want to accomplish (a goal) and less on what needs to be avoided because human beings are primarily goal-oriented by nature. As such, people tend to “see” only what the mind expects, or wants, to see.\n",
"This indicates fragmentation of the psyche, the different feelings and thoughts of ‘I’ in a person: I think, I want, I know best, I prefer, I am happy, I am hungry, I am tired, etc. These have nothing in common with one another and are unaware of each other, arising and vanishing for short periods of time. Hence man usually has no unity in himself, wanting one thing now and another, perhaps contradictory, thing later.\n",
"As the human mind's cognitive structures are naturally disposed to both consciously and unconsciously gather and process information constantly in order to relate to the outside world, to oneself, and to one's own relations to the world (in other words, man constantly seeks and constructs sense, meaning, association, and belonging in order to understand and cope) also and most foremost in a social sense (\"Who am I, and how do I relate to the social continuum around me?\"), and because individual cognitive capabilities are as limited as that the individual is required to widely rely on social conventions in everyday life (which in combination with decreased instinctual drives is the origin of cognitive disposition towards \"social learning\" in primates), Bleibtreu-Ehrenberg posits that if no more positive social identity relating to one's traits is available, then even the most negative social identity, no matter with what aggressive and harmful behavior it is associated, is preferred to total loss of identity.\n",
"Putting others first. Dwelling on ourselves builds a wall between ourselves and others. Those who keep thinking about their needs, their wants, their plans, their ideas, cannot help becoming lonely and insecure. As human beings, it is our nature to be part of a whole, to live in a context where personal relationships are supportive and close.\n"
] |
what does remastering a game entail? | It *completely* depends on the company doing the "remastering". There is no fixed set of things except, perhaps, as requirements from the licensor. In addition, there are often limitations on what can be overhauled because original development materials may have been lost or are otherwise no longer available.
A good example of this is Beamdog/Overhaul Games' remake of the Baldur's gate series: Because the level/area files for BG are rendered 3D scenes, and because the original 3D model files had been lost, Beamdog had to work with the level images as they were originally released- with some fancy math used to upscale the resolution of those images while still seemingly retaining detail.
On some other games most or all of the original development materials remain, including original artwork, and higher resolution versions of the masters, including audio, used.
But how much work and what work is done is very much handled on a game-by-game basis. | [
"When remastering a distro, remastering software can be applied from the \"inside\" of a live operating system to clone itself into an installation package. Remastering does not necessarily require the remastering software, which only facilitates the process. For example, an application is remastered just by acquiring, modifying and recompiling its original source code. Many video games have been modded by upgrading them with additional content, levels, or features. Notably, \"Counter-Strike\" was remastered from \"Half-Life\" and went on to be marketed as a commercial product.\n",
"Software remastering is software development that recreates system software and applications while incorporating customizations, with the intent that it is copied and run elsewhere for \"off-label\" usage. If the remastered codebase does not continue to parallel an ongoing, upstream software development, then it is a fork, not a remastered version. The term comes from \"remastering\" in media production, where it is similarly distinguished from mere copying. Remastering was popularized by Klaus Knopper, creator of Knoppix. The Free Software Foundation promotes the universal freedom to recreate and distribute computer software, for example by funding projects like the GNU Project.\n",
"Software remastering creates an application by rebuilding its code base from the software objects on an existing master repository. If the \"mastering\" process assembles a distribution for the release of a version, the remaster process does the same but with subtraction, modification, or addition to the master repository. Similarly a modified makefile orchestrates a computerized version of an application.\n",
"Remastering is the process of making a new master for an album, film, or any other creation. It tends to refer to the process of porting a recording from an analogue medium to a digital one, but this is not always the case.\n",
"A \"remaster\" is a personalized version of PCLinuxOS created according to the needs of an individual. It is created using the mklivecd script applied to its installation, which can be of any of the \"official\" flavors of PCLinuxOS. An \"official remaster\" can only include software and components from the official repository (version control).\n",
"In some tournaments, known as “rebuy tournaments”, players have the ability to re-buy into the game in case they lost all their chips and avoid elimination for a specific period of time (usually ranging from one to two hours). After this so-called “rebuy period”, the play resumes as in a standard freezeout tournament and eliminated players do not have the option of returning to the game any more. Rebuy tournaments often allow players to rebuy even if they have not lost all their chips, in which case the rebuy amount is simply added to their stack. A player is not allowed to rebuy in-game if he has too many chips (usually the amount of the starting stack or half of it). At the end of the rebuy period remaining players are typically given the option to purchase an “add-on”, an additional amount of chips, which is usually similar to the starting stack.\n",
"\"Remorting\" (also known as \"rebirth\", \"ascending/ascension\", \"reincarnating\", or \"new game plus\") is a game mechanic in some role-playing games whereby, once the player character reaches a specified level limit, the player can elect to start over with a new version of his or her character. The bonuses that are given are dependent on several factors, which generally involve the stats of the character before the reincarnation occurs. The remorting character generally loses all levels, but gains an advantage that was previously unavailable, usually access to different races, avatars, classes, skills, or otherwise inaccessible play areas within the game. A symbol often identifies a remorted character.\n"
] |
I heard something off of my granddad about World War 2 spies. He said that, when the British were interrogating German spies, they would end the interrogation with "good luck" or "hail victory" in German and, if the German replied, they would know he was a spy. Is there any validity to this? | As far as "good luck" goes, he may be thinking of a scene in the 1963 film *The Great Escape* where this happens in reverse- escaped British PoWs are captured when a Gestapo officer wishes them "Good luck" in English and one of them instinctively replies "thank you".
I have seen claims (for instance in *This Great Escape: The Case of Michel Paryla* by Andrew Steinmetz, and *The RAF's French Foreign Legion* by G.H. Bennett) that this incident is based on the real-life case of the French escapee Sous-Lt. Bernard Steinhauer, who was fluent in English and German as well as his native French and who was captured at Saarbrücken station after replying in English to an English greeting by a Gestapo officer- although sources differ on the exact phrase used.
(Like most of those who escaped in the breakout from Stalag Luft III, Sous-Lt. Steinhauer was shot a few days later) | [
"During World War II, an American intelligence agent in England, ashamed for having yielded information to the Germans during a previous capture, attempts to redeem himself by contriving his way into a French resistance group, with his ultimate plan being to kidnap a valuable German general and obtain his secrets.\n",
"The Germans could have suspected even more surreptitious activities, since Portugal, like Switzerland, was a crossroads for internationals and spies from both sides. British historian James Oglethorpe investigated Howard's connection to the secret services. Ronald Howard's book explores the written German orders to the Ju 88 squadron, in great detail, as well as British communiqués that verify intelligence reports indicating a deliberate attack on Howard. These accounts indicate that the Germans were aware of Churchill's real whereabouts at the time and were not so naive as to believe he would be travelling alone on board an unescorted, unarmed civilian aircraft, which Churchill also acknowledged as improbable. Ronald Howard was convinced the order to shoot down Howard's airliner came directly from Joseph Goebbels, Minister of Public Enlightenment and Propaganda in Nazi Germany, who had been ridiculed in one of Leslie Howard's films, and believed Howard to be the most dangerous British propagandist.\n",
"A woman spy and some male agents working for the Germans during World War I land at night near the British naval base at Scapa Flow, from a U-boat. The British, led by Col. Foreman, ambush the landing party, capturing two of the men, but the woman gets away. Foreman fakes the execution of one of the spies, thus tricking the second one, Meyer, into becoming a double agent in the hopes of using him to capture his woman accomplice, whom Meyer identifies under the codename Fraulein Doktor. Fraulein Doktor is portrayed as a brilliant spy who stole a formula for a skin blistering gas similar to mustard gas which the Germans used to great effect against the Allies on the battlefield. \n",
"During the Second World War, a German spy goes on the run, carrying important news about a U-Boat campaign. The ship he is travelling aboard is hit by a torpedo. The spy winds up at a lighthouse with other survivors, one of whom is a counterintelligence agent who reveals the German spy's true identity.\n",
"Once caught, the spies were deposited in the care of Lieutenant Colonel Robin Stephens at Camp 020 (Latchmere House, Richmond). After Stephens, a notorious and brilliant interrogator, had picked apart their life history, the agents were either spirited away (to be imprisoned or killed) or if judged acceptable, offered the chance to turn double agent on the Germans.\n",
"At least 20 spies were sent to England by boat or parachute to gather information on the British coastal defences under the codename \"Operation Lena\"; many of the agents spoke limited English. All agents were quickly captured and many were convinced to defect by MI5's Double-Cross System, providing disinformation to their German superiors. It has been suggested that the \"amateurish\" espionage efforts were a result of deliberate sabotage by the head of the army intelligence bureau in Hamburg, Herbert Wichmann, in an effort to prevent a disastrous and costly amphibious invasion; Wichmann was critical of the Nazi regime and had close ties to Wilhelm Canaris, the former head of the \"Abwehr\" who was later executed by the Nazis for treason.\n",
"The last false message exchanged with London in this operation was: \"Thank you for your collaboration and for the weapons that you sent us\". However, Nazi intelligence was not aware that British intelligence knew about the stratagem for at least two weeks prior to the transmission. From May 1944 onwards the operation was not a success.\n"
] |
how can general pain medication like paracetamol and ibuprofen treat so many different things? | Prostaglandins are natural chemicals that are released into your body when you are injured or sick. When they're released, they make nearby nerves hurt. This is when your body can tell that something is wrong, and you feel pain. Meds like ibuprofen target prostaglandins. It keeps more of them from being made, which reduces more nerve pain. So it's not so much that pills can hit a wide variety of targets, it's that the body's target is the same for most injuries. | [
"Many drug therapies are available for pain management after third molar extractions including NSAIDS (non-steroidal anti-inflammatory), APAP (acetaminophen), and opioid formulations. Although each has its own pain-relieving efficacy, they also pose adverse effects. According to two doctors, Ibuprofen-APAP combinations have the greatest efficacy in pain relief and reducing inflammation along with the fewest adverse effects. Taking either of these agents alone or in combination may be contraindicated in those who have certain medical conditions. For example, taking ibuprofen or any NSAID in conjunction with warfarin (a blood thinner) may not be appropriate. Also, prolonged use of ibuprofen or APAP has gastrointestinal and cardiovascular risks. There is high quality evidence that ibuprofen is superior to paracetamol in managing postoperative pain.\n",
"Initial recommended treatment is with simple pain medication such as ibuprofen and paracetamol (acetaminophen) for the headache, medication for the nausea, and the avoidance of triggers. Specific medications such as triptans or ergotamines may be used in those for whom simple pain medications are not effective. Caffeine may be added to the above. A number of medications are useful to prevent attacks including metoprolol, valproate, and topiramate.\n",
"Pain medication, such as aspirin and ibuprofen, are effective for the treatment of tension headache. Tricyclic antidepressants appear to be useful for prevention. Evidence is poor for SSRIs, propranolol and muscle relaxants.\n",
"Spasmolytics such as carisoprodol, cyclobenzaprine, metaxalone, and methocarbamol are commonly prescribed for low back pain or neck pain, fibromyalgia, tension headaches and myofascial pain syndrome. However, they are not recommended as first-line agents; in acute low back pain, they are not more effective than paracetamol or nonsteroidal anti-inflammatory drugs (NSAIDs), and in fibromyalgia they are not more effective than antidepressants. Nevertheless, some (low-quality) evidence suggests muscle relaxants can add benefit to treatment with NSAIDs. In general, no high-quality evidence supports their use. No drug has been shown to be better than another, and all of them have adverse effects, particularly dizziness and drowsiness. Concerns about possible abuse and interaction with other drugs, especially if increased sedation is a risk, further limit their use. A muscle relaxant is chosen based on its adverse-effect profile, tolerability, and cost.\n",
"Ibuprofen helps decrease pain in children with migraines. Paracetamol does not appear to be effective in providing pain relief. Triptans are effective, though there is a risk of causing minor side effects like taste disturbance, nasal symptoms, dizziness, fatigue, low energy, nausea, or vomiting.\n",
"Over-the-counter drugs, like acetaminophen, aspirin, or NSAIDs(ibuprofen, Naproxen, Ketoprofen), can be effective but tend to only be helpful as a treatment for a few times in a week at most. For those with gastrointestinal problems (ulcers and bleeding) acetaminophen is the better choice over aspirin, however both provide roughly equivalent pain relief. It is important to note that large daily doses of acetaminophen should be avoided as it may cause liver damage especially in those that consume 3 or more drinks/day and those with pre-existing liver disease. Ibuprofen, one of the NSAIDs listed above, is a common choice for pain relief but may also lead to gastrointestinal discomfort.\n",
"Ibuprofen/paracetamol sold under the brand name Combiflam is a combination of the two medications, ibuprofen and paracetamol (acetaminophen). It is available in India. It may be used for fever, headache, muscle pain and menstrual cramps (MC). Ibuprofen belongs to nonsteroidal anti-inflammatory drug (NSAID) class of drugs.\n"
] |
why do massive arcade style coin operated machines suck so much in comparison to other video game consoles? | It actually used to be the opposite way around. Back in '94, we were getting things like Cruisin' USA and Sega Rally that were a generation ahead of where consoles were at the time, and that were built on hardware that wasn't bettered until the PS2 generation. Unfortunately, that's pretty much what killed arcades. Used to be that consoles advertised themselves as offering an arcade-grade experience. When the PS2 surpassed them, it rendered them redundant, basically killing their market, and killing their progress. And that's why today, arcade has gone from being an aspirational term to almost a dirty word. | [
"Due to the success of arcades, a number of games were adapted for and released for consoles but in many cases the quality had to be reduced because of the hardware limitations of consoles compared to arcade cabinets.\n",
"Developing from earlier non-video electronic game cabinets such as pinball machines, arcade-style video games (whether coin-operated or individually owned) are usually dedicated to a single game or a small selection of built-in games and do not allow for external input in the form of ROM cartridges. Although modern arcade games such as \"Dance Dance Revolution X\" and \"\" do allow external input in the form of memory cards or USB sticks, this functionality usually only allows for saving progress or for providing modified level-data, and does not allow the dedicated machine to access new games. The game or games in a dedicated arcade console are usually housed in a stand-up cabinet that holds a video screen, a control deck or attachments for more complex control devices, and a computer or console hidden within that runs the games.\n",
"Virtually all modern arcade games (other than the very traditional Midway-type games at county fairs) make extensive use of solid state electronics, integrated circuits and cathode-ray tube screens. In the past, coin-operated arcade video games generally used custom per-game hardware often with multiple CPUs, highly specialized sound and graphics chips, and the latest in expensive computer graphics display technology. This allowed arcade system boards to produce more complex graphics and sound than what was then possible on video game consoles or personal computers, which is no longer the case in the 2010s. Arcade game hardware in the 2010s is often based on modified video game console hardware or high-end PC components. Arcade games frequently have more immersive and realistic game controls than either PC or console games, including specialized ambiance or control accessories: fully enclosed dynamic cabinets with force feedback controls, dedicated lightguns, rear-projection displays, reproductions of automobile or airplane cockpits, motorcycle or horse-shaped controllers, or highly dedicated controllers such as dancing mats and fishing rods. These accessories are usually what set modern video games apart from other games, as they are usually too bulky, expensive, and specialized to be used with typical home PCs and consoles. Currently with the advent of Virtual reality, arcade makers have begun to experiment with Virtual reality technology. Arcades have also progressed from using coin as credits to operate machines to cards that hold the virtual currency of credits.\n",
"Arcades typically have change machines to dispense tokens or quarters when bills are inserted, although larger chain arcades, such as Dave and Busters and Chuck E. Cheese are deviating towards a refillable card system. Arcades may also have vending machines which sell soft drinks, candy, and chips. Arcades may play recorded music or a radio station over a public address system. Video arcades typically have subdued lighting to inhibit glare on the screen and enhance the viewing of the games' video displays, as well as of any decorative lighting on the cabinets.\n",
"The distinction with slot machines is not clearly defined; in the United Kingdom, such machines found in arcades and pubs are called AWPs, while machines in casinos may instead be called slots. There is different licensing depending on the premise, with AWP machines having lower limits on stake wagered and payout.\n",
"A new phenomenon across Pennsylvania is the proliferation of \"skill machines\". These machines, often looking like video slot machines or VGTs, are able to circumvent gaming laws due to a prior court decision that decided they were not slot machines. Thus, these machines can now be found at many bars, clubs, gas stations, and tobacco shops across the state.\n",
"Prior to the 2000s, it was generally accepted that most home consoles were not powerful enough to accurately replicate arcade games (such games are known as being \"arcade-perfect\"). As such, there was correspondingly little effort to bring arcade-quality controls into the home. Though many imitation arcade controllers were produced for various consoles and the PC, most were designed for affordability and few were able to deliver the responsiveness or feel of a genuine arcade setup.\n"
] |
why do developing countries receive development aid from other countries instead of simply "adding" the same amount of money into government budget? | Hyperinflation from printing money to cover government deficits happens because the supply of the currency is dramatically increased. Note that this happens relative to the currency of which the supply is increasing--for example, when there is hyperinflation occurring with the Zimbabwe dollar, prices when paying with U.S. dollars may actually be comparatively stable. This is why, when inflation becomes very bad, people try to abandon the local currency and use a more stable foreign currency, even if it is illegal to do so.
Development aid comes in the form of foreign currency or it's aid "in kind," in the form of goods. So the supply of the local currency isn't changed at all. It can still have a strong effect on the local economy, but for different reasons. | [
"There are an increasing number of studies and literature that argue aid alone is not enough to lift developing countries out of poverty. Whether or not aid actually significantly affects growth, it does not operate in a vacuum. An increasing number of donor country policies can either complement or hinder development, such as trade, investment, or migration. The Commitment to Development Index published annually by the Center for Global Development is one such attempt to look at donor country policies toward the developing world and move beyond simple comparisons of aid given. It accounts for not only the quantity but the quality of aid, penalizing nations that given large amounts of tied aid.\n",
"Development aid is given by governments through individual countries' international aid agencies and through multilateral institutions such as the World Bank, and by individuals through . For donor nations, development aid also has strategic value; improved living conditions can positively effects global security and economic growth. Official Development Assistance (ODA) is a commonly used measure of developmental aid.\n",
"Many developing countries desire increased inflows of foreign direct investment as it brings the potential of technological innovation. However, studies have shown a host country must reach a certain level of development in education and infrastructure sectors in able to truly capture any potential benefits foreign direct investment might bring. If a country already has sufficient funds in terms of per capita income, as well as an established financial market, foreign direct investment has the potential to influence positive economic growth. Pre-determined financial efficiency combined with an educated labor force are the two main measures of whether or not foreign direct investment will have a positive impact on economic growth within a country.\n",
"Research has shown that developed nations are more likely to give aid to nations who have the worst economic situations and policies (Burnside, C., Dollar, D., 2000). They give money to these nations so that they can become developed and begin to turn these policies around. It has also been found that aid relates to the population of a nation as well, and that the smaller a nation is, the more likely it is to receive funds from donor agencies. The harsh reality of this is that it is very unlikely that a developing nation with a lack of resources, policies, and good governance will be able to utilize incoming aid money in order to get on their feet and begin to turn the damaged economy around. It is more likely that a nation with good economic policies and good governance will be able to utilize aid money to help the country establish itself with an existing foundation and be able to rise from there with the help of the international community. But research shows that it is the low-income nations that will receive aid more so, and the better off a nation is, the less aid money it will be granted. On the other hand, Alesina and Dollar (2000) note that private foreign investment often responds positively to more substantive economic policy and better protections under the law. There is increased private foreign investment in developing nations with these attributes, especially in the higher income ones, perhaps due to being larger and possibly more profitable markets.\n",
"Furthermore, consider the breakdown, where aid goes and for what purposes. In 2002, total gross foreign aid to all developing countries was $76 billion. Dollars that do not contribute to a country's ability to support basic needs interventions are subtracted. Subtract $6 billion for debt relief grants. Subtract $11 billion, which is the amount developing countries paid to developed nations in that year in the form of loan repayments. Next, subtract the aid given to middle income countries, $16 billion. The remainder, $43 billion, is the amount that developing countries received in 2002. But only $12 billion went to low-income countries in a form that could be deemed budget support for basic needs. When aid is given to the Least Developed Countries who have good governments and strategic plans for the aid, it is thought that it is more effective.\n",
"For aid to be effective and beneficial to economic development, there must be some support systems or ‘traction’ that, will enable foreign aid to spur economic growth. Research has also shown that Aid actually damages economic growth and development before ‘traction’ is attained.\n",
"Despite decades of receiving aid and experiencing different development models (which have had very little success), many developing countries' economies are still dependent on developed countries, and are deep in debt. There is now a growing debate about why developing countries remain impoverished and underdeveloped after all this time. Many argue that current methods of aid are not working and are calling for reducing foreign aid (and therefore dependency) and utilizing different economic theories than the traditional mainstream theories from the West. Historically, development and aid have not accomplished the goals they were meant to, and currently the global gap between the rich and poor is greater than ever, though not everybody agrees with this.\n"
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Can someone explain the physics going on with the snapping shrimp when it shoots its shockwave bubble attack? | The most basic scenario of cavitation is if you have an infinite fluid, and magically cause a sphere of it to disappear, and track what happens to the water trying to fill that vacuum. In this case, it's not a vacuum but a vapour bubble, but the water collapses just the same. When this happens, the water nearest the bubble moves in, then the water that was next to that moves towards the bubble, etc, creating a shockwave travelling through the water. I don't know the physiology of the stun effect, but it's probably similar to hydrostatic shock that injures gunshot and grenade victims: a pressure wave travelling through the body. The reason the bubble leads to such a powerful shock is that the water collapses really, really fast, like a good portion of the speed of sound in water. The same type of bubbles are a major cause of damage to ship propellers (but from the propellers themselves, not from shrimp), and that's what originally got people thinking about this.
The temperature is highest when the pressure is highest, which occurs when the bubble is smallest. You can see this through the ideal gas law assuming a polytropic process, but I don't think that explains the temperatures observed. I've heard other things, like the pressure causes gas inside the bubble to ionize, and the ions emit bremstrahlung radiation as they accelerate.
Hope that helped. | [
"Pistol shrimp (also called \"snapping shrimp\") produce a type of cavitation luminescence from a collapsing bubble caused by quickly snapping its claw. The animal snaps a specialized claw shut to create a cavitation bubble that generates acoustic pressures of up to 80 kPa at a distance of 4 cm from the claw. As it extends out from the claw, the bubble reaches speeds of 60 miles per hour (97 km/h) and releases a sound reaching 218 decibels. The pressure is strong enough to kill small fish. The light produced is of lower intensity than the light produced by typical sonoluminescence and is not visible to the naked eye. The light and heat produced may have no direct significance, as it is the shockwave produced by the rapidly collapsing bubble which these shrimp use to stun or kill prey. However, it is the first known instance of an animal producing light by this effect and was whimsically dubbed \"shrimpoluminescence\" upon its discovery in 2001. It has subsequently been discovered that another group of crustaceans, the mantis shrimp, contains species whose club-like forelimbs can strike so quickly and with such force as to induce sonoluminescent cavitation bubbles upon impact.\n",
"The bigclaw snapping shrimp produces a loud, staccato concussive noise with its snapping claw. The sound is produced when the claw snaps shut at great speed creating a high-speed water jet. This creates a small, short-lived cavitation bubble and it is the immediate collapse of this bubble that creates the sound. A spark is formed at the same time. The snapping noise serves to deter predators and to stun prey, and is also used for display purposes.\n",
"When a torpedo with a contact fuze strikes the side of the target hull, the resulting explosion creates a bubble of expanding gas, the walls of which move faster than the speed of sound in water, thus creating a shock wave. The side of the bubble which is against the hull rips away the external plating creating a large breach. The bubble then collapses in on itself, forcing a high-speed stream of water into the breach which can destroy bulkheads and machinery in its path.\n",
"The snapping shrimp competes with much larger animals such as the sperm whale and beluga whale for the title of loudest animal in the sea. The animal snaps a specialized claw shut to create a cavitation bubble that generates acoustic pressures of up to 80 kPa at a distance of 4 cm from the claw. As it extends out from the claw, the bubble reaches speeds of and releases a sound reaching 218 decibels. The pressure is strong enough to kill small fish. It corresponds to a zero to peak pressure level of 218 decibels relative to one micropascal (dB re 1 μPa), equivalent to a zero to peak source level of 190 dB re 1 μPa m. Au and Banks measured peak to peak source levels between 185 and 190 dB re 1 μPa m, depending on the size of the claw. Similar values are reported by Ferguson and Cleary. The duration of the click is less than 1 millisecond.\n",
"Underwater shock waves produced by the explosion stun the fish and cause their swim bladders to rupture. This rupturing causes an abrupt loss of buoyancy; a small amount of fish float to the surface, but most sink to the seafloor. The explosions indiscriminately kill large numbers of fish and other marine organisms in the vicinity and can damage or destroy the physical environment, including extensive damage to coral reefs.\n",
"The impact can also produce sonoluminescence from the collapsing bubble. This will produce a very small amount of light within the collapsing bubble, although the light is too weak and short-lived to be detected without advanced scientific equipment. The light emission probably has no biological significance, but is rather a side effect of the rapid snapping motion. Pistol shrimp produce this effect in a very similar manner.\n",
"Cavitation bubbles, when near a solid surface, can also become a torus. The area away from the surface has an increased static pressure causing a high pressure jet to develop. This jet is directed towards the solid surface and breaks through the bubble to form a torus shaped bubble for a short period of time. This generates multiple shock waves that can damage the surface.\n"
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what starts the pumping of the human heart and how does it keep going? | You don't sound dumb. It's a good question. The heart has its own electrical system that keeps it pumping independent of brain function. Sometimes it misfires, though, and that can lead to things like heart attacks. Basically, as long as there's blood flowing through the heart to keep it alive it doesn't even need to be in the body. That's what they do for heart transplants. | [
"The cardiac cycle is the performance of the human heart from the ending of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole (), followed by a period of robust contraction and pumping of blood, dubbed systole (). After emptying, the heart immediately relaxes and expands to receive another influx of blood \"returning from\" the lungs and other systems of the body, before again contracting to \"pump blood to\" the lungs and those systems. A normally performing heart must be fully expanded before it can efficiently pump again. Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 seconds to complete the cycle.\n",
"The heart is the driver of the circulatory system, pumping blood through rhythmic contraction and relaxation. The rate of blood flow out of the heart (often expressed in L/min) is known as the cardiac output (CO).\n",
"Each heart beat originates as an electrical impulse from a small area of tissue in the right atrium of the heart called the sinus node or Sino-atrial node or SA node. The impulse initially causes both atria to contract, then activates the atrioventricular (or AV) node, which is normally the only electrical connection between the atria and the ventricles (main pumping chambers). The impulse then spreads through both ventricles via the Bundle of His and the Purkinje fibres causing a synchronised contraction of the heart muscle and, thus, the pulse.\n",
"The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node. These generate a current that causes contraction of the heart, traveling through the atrioventricular node and along the conduction system of the heart. The heart receives blood low in oxygen from the systemic circulation, which enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. From here it is pumped into the pulmonary circulation, through the lungs where it receives oxygen and gives off carbon dioxide. Oxygenated blood then returns to the left atrium, passes through the left ventricle and is pumped out through the aorta to the systemic circulation−where the oxygen is used and metabolized to carbon dioxide. The heart beats at a resting rate close to 72 beats per minute. Exercise temporarily increases the rate, but lowers resting heart rate in the long term, and is good for heart health.\n",
"The function of the heart is to drive blood through the circulatory system in a cycle that delivers oxygen, nutrients and chemicals to the body's cells and removes cellular waste. Because it pumps out whatever blood comes back into it from the venous system, the quantity of blood returning to the heart effectively determines the quantity of blood the heart pumps out – its cardiac output, \"Q\". Cardiac output is classically defined alongside stroke volume (SV) and the heart rate (HR) as:\n",
"The heart beats according to a rhythm set up by the sinus node or pacemaker. It is acted on by the nervous system, as well as hormones in the blood, and venous return: the amount of blood being returned to the heart. The two nerves acting on the heart are the vagus nerve, which slows heart rate down by emitting acetylcholine, and the accelerans nerve which speeds it up by emitting noradrenaline. This results in an increased bloodflow, preparing the body for a sudden increase in activity. These nerve fibers are part of the autonomic nervous system, part of the 'fight or flight' system.\n",
"The contraction of cardiac muscle (heart muscle) in all animals is initiated by electrical impulses known as action potentials. The rate at which these impulses fire controls the rate of cardiac contraction, that is, the heart rate. The cells that create these rhythmic impulses, setting the pace for blood pumping, are called pacemaker cells, and they directly control the heart rate. They make up the cardiac pacemaker, that is, the natural pacemaker of the heart. In most humans, the concentration of pacemaker cells in the sinoatrial (SA) node is the natural pacemaker, and the resultant rhythm is a sinus rhythm. \n"
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why do i see lots of black guys with white girls, and very few white guys with black girls? | The same reason black men date white women, because black women are crazy. | [
"most American white men are trained to be fags. For this reason it is no wonder their faces are weak and blank ... The average ofay [white person] thinks of the black man as potentially raping every white lady in sight. Which is true, in the sense that the black man should want to rob the white man of everything he has. But for most whites the guilt of the robbery is the guilt of rape. That is, they know in their deepest hearts that they should be robbed, and the white woman understands that only in the rape sequence is she likely to get cleanly, viciously popped.\n",
"The Yellow girl is the only American character in the show, who traveled all the way to Britain in order to see Paul McCartney. The Orange woman is shown as a full grown woman who is married, in her forties, and is starting to suspect her husband is cheating on her. The Blue girl is gorgeous and wealthy, and while she can go on and on about how perfect her life is, she does face some questions regarding her sexuality. The Green girl is the classic sexually-charged \"racey\" character in the show, always hooking up with men and throwing innuendos around. Finally, the Red girl is the youngest and most hopeful character; she is a bit hopeless in the beginning, stating she is not good-looking like other girls, until the man of her dreams comes along.\n",
"Critics have praised \"Awkward Black Girl\" for its witty humor and unique, realistic portrayal of African-American women. \"New York Times\" critic Jon Caramica describes the show as “full of sharp, pointillist humor that’s extremely refreshing.” On her site beyondblackwhite.com, Christelyn Karazin blogs, “Aren't you tired of seeing black women look like idiots on television? Here's a girl—whom I suspect is a lot like the women who read this blog—quirky, funny, a little unsure of herself, rocks her hair natural and is beautifully brown skinned.” Erin Stegeman of \"The Tangled Web\" praises \"Awkward Black Girl\" for defying stereotypes of African American women and being “an uber-relatable slice of life, narrated by J’s inner-ramblings that run through any awkward person’s mind.” In its honest portrayal of the African-American experience and its depiction of the main character, J, as a \"cultural mulatto,\" \"Awkward Black Girl\" belongs to the \"New Black Aesthetic,\" a term coined by African-American novelist Trey Ellis to describe an artistic movement that aims to create fuller meanings of black identity by exploring intra-racial diversity, reexamining stereotypes, and presenting blackness authentically.\n",
"Funny Ladies of Color was a comedy group in the 1990s formed by comedians Lydia Nicole and Cha Cha Sandoval-Epstein. The group was several women of varied ethnic backgrounds- African American, Latino, Armenian, Chicana-Jewish, South Korean, black Puerto Rican, and Filipino. Their popularity grew out of the uniqueness of their brand as a strictly minority crew.\n",
"A group of African-American men, mostly petty criminals, gathered in a room are talking about their experiences with white women. It is soon revealed that one of them (Tony El-Ay) never had sex with a white woman. Furthermore, he rejects the very idea and his friends try to convince him by praising white women. Before he is finally won over, he confesses his fear of white women.\n",
"In daily life, individuals are more likely to encounter white people as the default race within the United States as opposed to Black individuals. When encountering atypical whites (white people with features associated with Blackness), individuals ultimately settle on a White response (the general response to typical white targets is to decide not to shoot quicker and more frequently than in trials with black targets), in contrast to encountering Blacks with atypical features where Black cues appear to be more dominant and elicit a Black (to decide to shoot quicker and more frequently than trials with white targets) due to a misplaced threat perception. Lay people are more racially biased, on average, than trained individuals such as police officers. Prototypicality is shown to moderate racial bias which has been shown to be linked to a perceived threat as black people specifically are predisposed to being viewed as more threatening. Police officers show a reduced racial bias in comparison to members of the community; however, police officers were no better than community members in their sensitivity to prototypic targets providing evidence that prototypicality is directly linked to stereotypes and threat perception which ultimately perpetuates stereotype threat. Members of the same category (race) become harder to distinguish from other members of the same category the more they look like a prototypical representation of their category. (Young, Hugenberg, Bernstein, Sacco 2009).\n",
"In one instance, a United States grouping of Women in Black was accused of mocking and showing disrespect to American soldiers. The Athens, Georgia chapter was the subject of a letter to the Athens \"Banner-Herald\" in October 2007 for a protest at which an unidentified individual, said not to be a member of the military, allegedly dressed up in a U.S. Army uniform, put pacifist political buttons on it, and held peace signs with the Women in Black.\n"
] |
why is 95 gasoline powerful than 92? | Are you talking about octane rating? If so, it's not more powerful. Octane rating indicates how much compression the fuel can sustain before it ignites. A high octane rating can be compressed more, thus high-powered engines that compress the fuel more need it in order to avoid it igniting prematurely, causing knocking and engine wear. If your car doesn't have one of those engines, any octane gasoline will work just the same for you. | [
"Most gasoline (petrol) and diesel engines have an expansion ratio equal to the compression ratio (the compression ratio calculated purely from the geometry of the mechanical parts) of 10:1 (premium fuel) or 9:1 (regular fuel), with some engines reaching a ratio of 12:1 or more. The greater the expansion ratio the more efficient is the engine, in principle, and higher compression / expansion -ratio conventional engines in principle need gasoline with higher octane value, though this simplistic analysis is complicated by the difference between actual and geometric compression ratios. High octane value inhibits the fuel's tendency to burn nearly instantaneously (known as \"detonation\" or \"knock\") at high compression/high heat conditions. However, in engines that utilize compression rather than spark ignition, by means of very high compression ratios (14-25:1), such as the diesel engine or Bourke engine, high octane fuel is not necessary. In fact, lower-octane fuels, typically rated by cetane number, are preferable in these applications because they are more easily ignited under compression.\n",
"Gasoline contains about 46.7 MJ/kg (127 MJ/US gal; 35.3 kWh/US gal; 13.0 kWh/kg; 120,405 BTU/US gal), quoting the lower heating value. Gasoline blends differ, and therefore actual energy content varies according to the season and producer by up to 1.75% more or less than the average. On average, about 74 L (19.5 US gal; 16.3 imp gal) of gasoline are available from a barrel of crude oil (about 46% by volume), varying with the quality of the crude and the grade of the gasoline. The remainder are products ranging from tar to naphtha.\n",
"In the UK the most common gasoline grade (and lowest octane generally available) is 'Premium' 95 RON unleaded. 'Super' is widely available at 97 RON (for example \"Shell V-Power\", \"BP Ultimate\"). Leaded fuel is no longer available.\n",
"About 9 percent of all gasoline sold in the U.S. in May 2009 was premium grade, according to the Energy Information Administration. \"Consumer Reports\" magazine says, \"If [your owner’s manual] says to use regular fuel, do so—there's no advantage to a higher grade.\" The \"Associated Press\" said premium gas—which has a higher octane rating and costs more per gallon than regular unleaded—should be used only if the manufacturer says it is \"required\". Cars with turbocharged engines and high compression ratios often specify premium gas because higher octane fuels reduce the incidence of \"knock\", or fuel pre-detonation. The price of gas varies considerably between the summer and winter months.\n",
"The search for fuels with octane ratings above 100 led to the extension of the scale by comparing power output. A fuel designated grade 130 would produce 130 percent as much power in an engine as it would running on pure iso-octane. During WW II, fuels above 100-octane were given two ratings, a rich and lean mixture and these would be called 'performance numbers' (PN). 100-octane aviation gasoline would be referred to as 130/100 grade.\n",
"In 2007, in the United States, average retail (at the pump) prices, including federal and state fuel taxes, of B2/B5 were lower than petroleum diesel by about 12 cents, and B20 blends were the same as petrodiesel. However, as part of a dramatic shift in diesel pricing, by July 2009, the US DOE was reporting average costs of B20 15 cents per gallon higher than petroleum diesel ($2.69/gal vs. $2.54/gal). B99 and B100 generally cost more than petrodiesel except where local governments provide a tax incentive or subsidy.\n",
"Until the late 1920s, all automobile and aviation fuel was generally rated at 87 octane or less. This is the rating that was achieved by the simple distillation of \"light crude\" oil. Engines from around the world were designed to work with this grade of fuel, which set a limit to the amount of boosting that could be provided by the supercharger while maintaining a reasonable compression ratio.\n"
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