I never know what I'm going to talk about until I get on stage. I never give the same lecture twice, which is why I'll have people follow me from place to place like Deadheads.

The two most common elements in the universe are hydrogen and stupidity.

There's some things that no amount of money can get me to do.

I don't remember anyone who could stand being in my company for more than five hours without running into the street.

In string theory, all particles are vibrations on a tiny rubber band; physics is the harmonies on the string; chemistry is the melodies we play on vibrating strings; the universe is a symphony of strings, and the 'Mind of God' is cosmic music resonating in 11-dimensional hyperspace.

It was one of those evenings when men feel that truth, goodness and beauty are one. In the morning, when they commit their discovery to paper, when others read it written there, it looks wholly ridiculous.

I think you can get away with being a bit more political in science fiction.

I read 'On The Road' in college. I was 18 or 19, and I had a particular quarter where I was taking biology, calculus, and physics. Those were my three classes. It wasn't a well-rounded schedule at all. It was hard, hard work, all the time - hours and hours and hours of homework.