Ello all, new to the forums here. I just did a quick google search and wound up here. Figured i could get some answers to some of me questions i have about physics. A lil history real fast bout me. I was working on a network engineering degree, but after hating the IT field so much and not enjoying it, i went with something that i have always enjoyed... science. I am finishing up my generals and then i will be going into Mechanical Engineering since i like physics and science. Any way i have a question or two i would like to understand a bit more. I watched a nova special called Einsteins big idea. It explained somewhat about the E=mc^2. What i would like to know is this.. If light is the fastest thing we know of and nothing can go faster than light, why is it squared? You cant go faster than light so why square it? second, if a train is moving at the speed of light and it cant go anywhere faster, and we keep pushing it to go faster, all that energy has to go somewhere, that somewhere is the trains mass. So does the mass of the train square? IE, train weighs 10 tons, when it cant go any faster than light and that energy is converted to mass, does the train become 100 tons? thanx guys.