Special relativity is a theory that explains how time and space are related to each other. It was developed by Albert Einstein in 1905. The theory states that the laws of physics are the same for all observers, regardless of their relative motion.

One of the most famous equations in physics is E=mc^2. This equation shows the relationship between energy (E), mass (m), and the speed of light (c). It means that a small amount of mass can be converted into a large amount of energy. This is the basis for nuclear energy, where mass is converted into energy through a process called nuclear fusion.

In simpler terms, special relativity tells us that time and space are not absolute, but are relative to the observer. It also tells us that energy and mass are interchangeable, and that a small amount of mass can be converted into a large amount of energy.
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