I have a friend who's an artist, and he sometimes takes 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. But then he'll say, "I, as an artist, can see how beautiful a flower is. But you, as a scientist, take it all apart and it becomes dull." I think he's kind of nutty. [...] There are all kinds of interesting questions that come from a knowledge of science, which only adds to the excitement and mystery and awe of a flower. It only adds. I don't understand how it subtracts.

To test whether you have learned an idea or a definition, rephrase what you just learned without using the new word.

I have the advantage of having found out how hard it is to get to really know something. How careful you have to be about checking your experiments. How easy it is to make mistakes and fool yourself. I know what it means to know something.

Don't worry about anything. Go out and have a good time.

No man is rich who is unsatisfied, but who wants nothing possess his heart's desire.

The inside of a computer is as dumb as hell but it goes like mad!

We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."