E = mc^2

 The equation "e = mc^2" is one of the most famous equations in physics, and it was first proposed by Albert Einstein in 1905 as part of his theory of special relativity.

The equation states that energy (e) is equal to mass (m) multiplied by the speed of light (c) squared. In other words, it shows that mass and energy are two different forms of the same thing and that they can be converted into each other.

This equation has many important implications, including the fact that a small amount of mass can be converted into a huge amount of energy (as seen in nuclear reactions) and that nothing can travel faster than the speed of light. It is also a fundamental principle of modern physics and has been tested and verified many times through experiments and observations.