"The thing that bothered me about it was that I was doing work for the military, and I didn't like that."

"I was very surprised that a lot of artists, when they found out I was a scientist, they would start telling me about their theories of the universe, and they were always crackpot theories."

"You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing…"

"The only way to do something is to do it. Not to talk about it, not to plan it, but to do it."

"Physicists are like little children, they want to know how the world works. But they're not content to just wonder. They want to open up the toy and see what's inside."