"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…"

"I have never been afraid to be wrong."

"The most important thing in life is to be happy."

"If there were nobody in the world but politicians, I would feel that there was no hope for mankind, no hope for civilization, no hope for the world."

"I have always been interested in the nature of things, and especially in the nature of life."