To become an astronaut is not a question of being the best at something or things coming easy to you, but it's being a person that can work with others and not give up. And, for me, that was part of it too.

Astronauts cannot pick their nicknames and can only get their nicknames from other astronauts. Any astronaut who tries to give himself a cool nickname will regret it by getting just the opposite from his astronaut friends.

I think most astronauts are not risk takers. We take calculated risks for something that we think is worthwhile.

To become an astronaut is not a question of being the best at something or things coming easy to you, but it's being a person that can work with others and not give up. And, for me, that was part of it too.

At every step of the way, when I had trouble, there were people that came in, in my life that helped me. It's important to go seek help when you need it, and to give help when other people need it. And that is really more important than coming in with a gigantic brain into the astronaut program.

The hardest thing for me as an astronaut was to improve my swimming skills.

My odyssey to become an astronaut kind of started in grad school, and I was working, up at MIT, in space robotics-related work; human and robot working together.