Viewing the earth from above gives you this sense of how special the planet is that we live on.

My undergraduate, I double-majored in biology and chemistry. Biology was kind of my love.

Unfortunately, spaceflight takes a lot of time and money.

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.

I think the legacy of the space station will be that we can do something this technically complex in an international way.