a preference for its judgments on all disputed points." Newton's flaming laser sword, also known as Alder's razor: What cannot be settled by experiment is not worth debating. Newton's law of cooling: The rate of cooling (or heating) of a body due to convection is proportional to the difference between the body temperature and the ambient temperature. Newton's laws of motion, in physics, are three scientific laws concerning the behaviour of moving bodies, which are fundamental to classical mechanics (and since Einstein, which are valid only within inertial reference frames). Discovered and stated by Isaac Newton (1643–1727), they can be formulated, in modern terms, as follows: First law: A body remains at rest, or keeps moving in a straight line (at a constant velocity), unless acted upon by a net outside force. Second law: The acceleration of an object of constant mass is proportional to the net force acting upon it. Third law: Whenever one body exerts a force upon a second body, the second body exerts an equal and opposite force upon the first body. Nielsen's law: A high-end user's internet connection speed grows by 50% per year. Niven's laws: several aphorisms, including "If the universe of discourse permits the possibility of time travel and of changing the past, then no time machine will be invented in that universe." Occam's razor: explanations should never multiply causes without necessity. ("Entia non sunt multiplicanda praeter necessitatem.") When two or more explanations are offered for a phenomenon, the simplest full explanation is preferable. Named after William of Ockham (c. 1285–1349). Oddo–Harkins rule: elements with an even atomic number are more common than those with odd atomic number. Named after Giuseppe Oddo and William Draper Harkins. Ohm's law, in physics: the ratio of the potential difference (or voltage drop) between the ends of a conductor (and resistor) to the current flowing through it is a constant. Discovered by and named after Georg Simon Ohm (1789–1854). Ohm's acoustic law is an empirical approximation concerning the perception of musical tones, named for Georg Simon Ohm. Okrent's law is Daniel Okrent's take on the argument to moderation. Okun's law, in economics: when unemployment increases by 1%, the annual GDP decreases by 2%. Orgel's rules, in evolutionary biology, are a set of axioms attributed to the evolutionary biologist Leslie Orgel: First rule: "Whenever a spontaneous process is too slow or too inefficient a protein will evolve to