"Scientific knowledge is a body of statements of varying degrees of certainty—some most unsure, some nearly sure, but none absolutely certain."

"I would rather have a world with five billion people that didn't know how to read than a world with five billion people that all knew how to read and all thought the same thing."

"I bet you anything that if you asked a hundred physicists, they would all say that the most beautiful equation in physics is Maxwell's equations."

"The more you learn, the more you realize how much you don't know."

"I don't believe in God. I don't believe in anything. I'm a scientist."