It is astonishing to realize that until Galileo performed his experiments on the acceleration of gravity in the early seventeenth century, nobody questioned Aristotle's falling balls. Nobody said, Show Me!

I don't want to make a member of Congress do something that that member of Congress's constituents would not approve of, or would not agree to. So in that regard, I'm kind of the opposite of a lobbyist.

One of the things that fascinates me most is when people are so charmed by the universe that it becomes part of their artistic output.

Rational thoughts never drive people's creativity the way emotions do.

Math is the language of the universe. So the more equations you know, the more you can converse with the cosmos.

We live in a world where not everyone has the urge to help others... It is OK to encourage others to pull themselves up by the bootstraps, but if you do, just remember that some people have no boots.

Follow the evidence wherever it leads, and question everything.