Whoo! I am so cool that I understand the derivation of E=mc^2 – ya know – Eee equals emm see squared… it derived by application of energy work functions and Lorentz transformations. Its pretty cool.
I’m not sure I ever realized the implications that an object(or particle) in motion actually has more energy than that, and in the case of an accelerated particle close to c, there is alot of energy.