A great deal more is known than has been proved.

The real problem in speech is not precise language. The problem is clear language.

Physicists like to think that all you have to do is say, these are the conditions, now what happens next?

My friends and I had taken dancing lessons, although none of us would ever admit it. In those depression days, a friend of my mother was trying to make a living by teaching dancing in the evening, in an upstairs dance studio. There was a back door to the place, and she arranged it so the young men could come up through the back way without being seen.

If we want to solve a problem that we have never solved before, we must leave the door to the unknown ajar.

Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it

It's because somebody knows something about it that we can't talk about physics. It's the things that nobody knows anything about we can discuss.