"You know, the dumbest goddamn student you ever saw can understand things if you explain them right. So if you can’t explain it, it’s because you don’t understand it."

"Religion is a culture of faith; science is a culture of doubt."

"I don't think there's any such thing as a 'best' way to do anything. There's just what works."

"I would rather have a world with five billion people that are happy and healthy and well-fed and full of wonderful things than a world with twenty billion people who are starving and miserable."

"It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong."