The “E” in E=MC2 might as well stand for Einstein instead of Energy. Albert’s famous equation shows us the relationship between matter and energy. Since the speed of light is such a large number and we’re squaring it, the equation implies that you only need a tiny bit of mass to make a whole lot of energy. Our E=MC2 necklace makes a great gift for anyone who spends a great deal of time pondering this interesting relationship between matter and energy. If you’re one of these people, then buy this necklace for yourself! It also makes a great gift for physicists, Einstein fans, outer space fans, and rocket scientists.