Too many people, when they get old, think that they have to live by the calendar.

On K-12 education America has gone down, down, down compared to the other nations. It doesn't mean that we have gotten dumber. It just means that we have not advanced as fast in those areas as other nations have done, and we're way down right now.

The moment of twilight is simply beautiful.

I suppose the one quality in an astronaut more powerful than any other is curiosity. They have to get some place nobody's ever been.

I think a mentor gets a lot of satisfaction in a couple of ways. They're doing something constructive, so they feel good about that. And when they see the results of this, with the young people they're working with, it's very, very rewarding.

I don't know what you could say about a day in which you have seen four beautiful sunsets.

I still have my [flight] license and I can still pass a flight physical.