Hey all, we are all familiar with the equation [tex]E=mc^2[/tex] Where energy equals mass times the speed of light squared... My question is...why? I mean, of course it works, but why the speed of light? My theory so far has been that since light is pure energy, its speed is used as a sort of constant when it comes to measuring energy. But...why the speed? Why not some other property. I dunno, its jsut causing some cognitive dissonance right now, It seems like speed shouldn't be in there. Please don't go out of your way to tell me "oh yes it should, because that equation works"...I'm not making any claism that its false at all.