If I say [electrons] behave like particles I give the wrong impression; also if I say they behave like waves. They behave in their own inimitable way, which technically could be called a quantum mechanical way. They behave in a way that is like nothing that you have seen before.

Observation, reason, and experiment make up what we call the scientific method.

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

There is no learning without having to pose a question. And a question requires doubt.

A philosopher once said, 'It is necessary for the very existence of science that the same conditions always produce the same results.' Well, they don't!

Some things that satisfy the rules of algebra can be interesting to mathematicians even though they don't always represent a real situation.

I think it's much more interesting to live not knowing than to have answers which might be wrong.