It used to be the case, like you'd switch jobs, and then maybe you wouldn't keep in touch with all the people that you knew from that old job, just because it was too hard. But one of the things that Facebook does is it makes it really easy to just stay in touch with all these people.

The Moon is a ball of left-over debris from a cosmic collision that took place more than four billion years ago. A Mars-sized asteroid - one of the countless planetesimals that were frantically churning our solar system into existence - hit the infant Earth, bequeathing it a very large natural satellite.

The supreme happiness of life is the conviction that we are loved; loved for ourselves, or rather in spite of ourselves.

In the United States, we can do almost anything we want. It's not like Egypt, where you're going to get murdered by the security forces.

The only meat I eat is from animals I've killed myself.