Hi. I understand the equation, but I don't understand logically in my head why it is that way. Maxwell's equations, etc show it mathematically but I'm looking for a logical explanation of why it is this way. Like for instance, the logical connection for F=MA would be "more force is needed to move a bigger object, or to move it faster."...now, as far as E=MC^2... What I know so far is this: energy should be directly proportional to mass, because something of more mass should release more energy. The speed of light fits in because it's sort of a measure of pure energy that's already been converted into mass completely. However, I don't understand: Why the speed? How does speed fit in? Why squared? Now, I know you all could prove it with maxwell's equations and such, but I'm not asking for proof, I'm asking for a logical explanation so I can see in my head why it works this way.