"I don't believe in the idea of a 'common man' or a 'common woman.' I believe in individual people."

"I have a great deal of difficulty with the idea of 'truth' in the philosophical sense."

"There are no rules in science, only facts."

"The thing that I cannot understand is what I cannot create. And I can't create a universe. So I don't understand the universe."

"I have a friend who's an artist and has sometimes taken a view which I don't agree with. He'll hold up a flower and say, 'Look how beautiful it is,' and I'll agree. Then he says, 'You see, as a scient…"