I always say getting my bachelor's was the single hardest thing I've done in my life. Once I got to university, I was working harder than I ever had before and, for the first time in my life, I was getting bad grades. It was demoralising.

The biggest technical challenge to sending astronauts on farther and longer missions is biomedical: How do we keep them healthy?

When I was at NASA, I had a house on a small private airstrip that we shared between the flying community. I had a hangar in my backyard with my airplane in it so I could just fly from my home.

Leroy Chiao Quotes