People say, oh we just need charismatic leaders to continue on to Mars. Now we've gone to the moon, of course Mars is next. No. Mars was never, of course, next. It is next if you think we went to the moon because we're explorers, but if you know we went to the moon because we were at war then we're never going to Mars. There's no military reason to do it, to justify the expenditure.

Nothing is a thing: it's nothing. So I can imagine a place where there's not even nothing.

Not everyone is going to like science as a subject.

Computers have proved to be formidable chess players. In fact, they've beaten our top human chess champions.

Dinosaurs are extinct today because they lacked opposable thumbs and the brainpower to build a space program.

Thomas Jefferson basically secularized Jesus.

If Pizza sizes were given in area not diameter, you'd see instantly that a 7 inch is less than half the size of a 10 inch pie