There could be whole antiworlds and antipeople made out of antiparticles. However, if you ever meet your antiself, don't shake hands! You would both vanish in a great flash of light.
Stephen HawkingA million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe.
Stephen HawkingScientists have become the bearers of the torch of discovery in our quest for knowledge.
Stephen Hawking