There's nothing a teacher likes better than ten minute videos. It's not the whole class, but it's not too short, it's enough to wrap a lesson plan around.

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

The cosmic calendar is quite a fertile mode for communicating how small we are over time and space.

Passion is what gets you through the hardest times that might otherwise make strong men weak, or make you give up.

Newton, Einstein, and every other great scientist in history...They all made mistakes. Of course they did. They're human! Science is a way to keep from fooling ourselves and each other.

After 50 years of television, there's no other conclusion the aliens could draw, but that most humans are neurotic, death-hungry, dysfunctional idiots.

There's a lot of memorization that goes on in school. You memorize vocabulary words and all these sorts of things.