It's because you're approaching the speed of light in a vacuum.
It's an E = mc**2 thing...
I new you were going to write that before you did.
That's because you're still young and nimble-minded, and I'm aging much faster than you are. Getting senile, I am...
Oh, and it's "knew", not "new"... I'm not totally senile yet...
Young and nimble left me more than 10 years ago.
Give me a break man, it's hard to control my dyslexia when I'm typing near the speed of light.