No one ever accomplished anything great sitting down.

I've had a chance to fly a lot of different airplanes, but it was nothing like the shuttle ride.

The danger is different from the fear. ... [practice] what to do if things go wrong, as well as right.

I've been lucky enough to fly to space twice.

Don`t let life randomly kick you into the adult you don`t want to become

Spaceflight isn't just about doing experiments, it's about an extension of human culture.

Scientific literacy is one of the underpinnings of everything I do. It's why I work with schools. It's why I teach at university. I do a lot of outreach to try and improve general scientific literacy, but the core of all scientific literacy is just literacy.