I want to encourage people to not think in terms of gifts, but think in terms of, wow. You work hard to succeed at that, because that's exactly what I do.

No matter what eyewitness testimony is in the court of law, it is the lowest form of evidence in the court of science.

Let's create a World's Fair that captures everybody's visions of tomorrow together and let's celebrate that vision. Let's have articles on it with illustrators imagining how we'd be living differently.

The chances that your tombstone will read 'Killed by Asteroid' are about the same as they'd be for 'Killed in Airplane Crash.'

God is an ever-receding pocket of scientific ignorance that's getting smaller and smaller and smaller as time moves on.

I don't want to go back into space for military reasons, but the economic driver still remains. And so it's a matter of people understanding how that economic driver is revealed with healthy investments on the space frontier.

Perhaps these ancient observatories like Stonehenge perennially impress modern people because modern people have no idea how the Sun, Moon, or stars move. We are too busy watching evening television to care what's going on in the sky.