My dad served in two wars has been flying airplanes for 60 years now. He was certainly quite an inspiration.

It took me a long time to get selected as an astronaut. In fact, I applied for 20 years before I was selected.

Researchers can measure what kind of angles your legs take up during the day when they're just trailing around behind you in weightless conditions, and what kind of impacts you feel during your exercise. They're going to compare that with what we do on the ground.

My dad served in two wars has been flying airplanes for 60 years now. He was certainly quite an inspiration.

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.

It so happened that my goals kind of matched my career progression toward becoming an astronaut.

Every day, we get a little bit closer to the kind of expertise and the kind of experience we're going to need to go there. I'd love to be the guy walking on Mars.