Special relativity is a theory developed by Albert Einstein that describes the relationship between space and time and the behavior of matter at very high speeds. In simple terms, here are three key concepts of special relativity:

1. Space and time are not absolute but relative to an observer's frame of reference, meaning they appear differently based on one's motion compared to another object. This means there isn't one universal clock ticking throughout the universe; instead, different observers experience events happening at different rates due to differences in their respective motions.
2. The speed of light remains constant for all observers regardless of their own velocity. This has important implications because nothing else in our world travels at this same rate. It leads to bizarre phenomena like length contraction and time dilation. As we approach lightspeed, time appears to slow down while distances seem shorter.
3. E=mc^2 famously represents the equivalence of energy and mass. It implies that massive amounts of energy can be unlocked from tiny amounts of matter since mass becomes equivalent to energy multiplied by c squared (approximately 3x10^8 m/s). Although small changes occur at normal speeds, these effects become much more pronounced near lightspeeds where even subtle increases in energy result in substantial gains in mass equivalency. Nuclear reactors harness this principle by converting just a few grams of uranium into tremendous amounts of energy.
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