If you thought that science was certain - well, that is just... - Richard Feynman

"We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on."

"Science is what we have learned about how to keep from fooling ourselves."

"If you thought you were trying to find out more about it because you're gonna get an answer to some deep philosophical question...you may be wrong! It may be that you can't get an answer to that particular question by finding out more about the character of nature. But my interest in science is to simply find out about the world."

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

"Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it."