I don't think the human race will survive the next thousand years, unless we spread into space.

If time travel is possible, where are the tourists from the future?

Computer viruses are alive.

Eternity is a long time, especially towards the end.

If what we regard as real depends on our theory, how can we make reality the basis of our philosophy? But we cannot distinguish what is real about the universe without a theory. It makes no sense to ask if it corresponds to reality, because we do not know what reality is independent of a theory.

Thirty years ago I was diagnosed with motor neurone disease, and given two and a half years to live. I have always wondered how they could be so precise about the half.

We are very, very small, but we are profoundly capable of very, very big things.