Wikipedia, mostly. You've got to give him the fact that the subject is interesting, even if he didn't type the description himself. Quite frankly, I couldn't care if all of it is copied and pasted, the main thing is the debate, and it's one I'd like to join in on when I've done my own research and have the time.

EDIT: Seeing as we're talking about time, I thought I'd post this description of time by Doctor Who (!K_A!'s post below reminded me of it):