"I like people. I like animals, too—whales and quail, dinosaurs and dodos. But I like human beings especially, and I am unhappy that the pool of human germ plasm, which determines the nature of the hum…"

"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

"The scientific method is a never-ending process of observation, hypothesis, experiment, and revision."

"You can't just have a good idea. You have to have a lot of good ideas."

"My own estimate is that all of the people in the United States would be killed in a nuclear war, if we do not build fallout shelters, and that if we do build them and train the American people, all of…"