i can prove einstiens equation e=mc^2 wrong, it stands for energy equals mass by the velocity of light squared, but light isn't neciccarily about 186000 miles per second(its either miles or kilometers), it only is in a vacuum. i read somewhere that if you shone light through ultracold carbon (a few kelvins above absolute zero), the light would only travel 17 meters per second, and lots of things can go faster than 17 meters per second.
[edit] forgot the end parenthasis: (its either miles or kilometers)