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I've been approached to do some things with astronauts and the preparation that astronauts go through.

We want to make sure we get living astronauts to the surface of Mars.

NASA has to approve whatever we wear, so there are clothes to choose from, like space shorts - we wear those a lot - and NASA T-shirts.

We're going to be focusing our science on things that will take us farther and longer into space. For many of those experiments, the crew members are human guinea pigs, which is fine; that's part of my job. I don't mind being a human guinea pig.

When you're in a spacecraft, you need to know what things you can touch and what things you shouldn't touch!

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

Any astronaut can tell you you've got to do everything you can to learn about your life support system and then do everything you can to take care of it.

There are no wishy-washy astronauts. You don't get up there by being uncaring and blase. And whatever gave you the sense of tenacity and purpose to get that far in life is absolutely reaffirmed and deepened by the experience itself.