Hi, I am new here, and love physics. I would like to know...if light is the fastest speed in our universe (670 Million miles per hour), in Einstein's formula...how can E=mc2 square the speed of light? Is that what it means, that light would have to travel 1340 Million miles per hour to change matter into energy, or vice versa? Is it saying that matter AND the speed of light together need to be squared, or just the speed of light squared? That can't be right if the fastest speed is 670Mil MPH. Can it? Is there a short answer I can comprehend? Thank you, Michel Michel