Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.

The real challenge is to work out what aliens might actually be like.

Some people would claim that things like love, joy and beauty belong to a different category from science and can't be described in scientific terms, but I think they can now be explained by the theory of evolution.

What I have learned from life is to make the most of what you have got.

If the rate of expansion one second after the Big Bang had been smaller by even one part in a hundred thousand million million, it would have recollapsed before it reached its present size. On the other hand, if it had been greater by a part in a million, the universe would have expanded too rapidly for stars and planets to form.

When I get to heaven I'm gonna find the guy in charge of the weather and kick his rear.

I'm here to chew gum and kick some ass, and I'm all out of gum.