We could have human intelligence in orbit around Mars, building things there.

My first biography written in '73 was not 'Journey To The Moon.' It was 'Return To Earth.' Because for me, that was the more difficult task - disappointment.

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.

It's real easy to manufacture what you think the people want to hear. But that's not very honest.

I grew up in New Jersey and never went up the Statue of Liberty.

Fear and worry are emotions that cloud the mind from being able to think clearly, to remember what the procedures are to deal with that emergency.

Astronauts are not superhuman. They lead ordinary lives and have varied personalities.