I mostly get books (the paper kind) for christmas and birthdays. Went old school on my flight today. http://www.gifstitch.com/s/6e1d6
Hong Kong physicists say they have proved that a single photon obeys Einstein’s theory that nothing can travel faster than the speed of light — demonstrating that outside science fiction, time travel is impossible.
What what what? This doesn’t make sense. How am I suppose to go back and be my own great great great great great grandfather? Does this mean I don’t exist?