Everyone who's been in space would, I'm sure, welcome the opportunity for a return to the exhilarating experiences there.

Ray Bradbury is one who is contributing to the understanding of the imagination and the curiosity of the human race.

We have the ability, at such high fidelity, to simulate the physical world through computers. But when the spiritual world or human behavior comes into play, we don't have a very good model for that at all.

A mind concerned about danger is a clouded mind. It's paralyzing.

I felt pretty confident in relieving myself, since I had the urge.

Unfortunately, kids are led to believe things are easier to achieve than they really are.

They didn’t tell me I was going into space until after they locked the shuttle doors and started counting down.