E = MC2; probably the most important equation mankind has ever known of. Coming from the genius of Albert Einstein himself, is the statement that energy is not forced to stay the way it is, and neither is mass; it declares that the two are interchangeable. Einstein pulled this from his head in the early year of 1905, such an early year for such a significant discovery. E = MC2, also known as the Theory of Relativity, is so vital in our world today.

Without it, our GPS systems, defense systems, and communications networks would not function properly. Some of the best fields this equation might be used in are practical and theoretical physics. If you don’t understand what this equation means right off the bat, I’ll try to make it simpler; it means that you can find the energy within an object by multiplying its mass by celeritas (speed of light) squared. Simple, right?

Well, it took humans many years to come up with something that simple, and thanks to Albert Einstein, we have.