I was inspired by the men who walked on the moon. It really was my inspiration, I think, you know, as a kid of 9 years old - I know I'm dating myself, but - I thought, 'What a cool job!'

My parents are the hardest-working people I ever knew: they always worked every day, all day; they had to come up with the solutions to make things work. And I think that work ethic, maybe stubbornness, single-mindedness, definitely played a role for me. I'm definitely thankful for my roots.

To be able to float and move around and, pretty much effortlessly, do whatever you want with your body in space is pretty amazing.