So long as you have courage and a sense of humor, it is never too late to start life afresh.

If you start out with a tragic view of life, then anything since is just a bonus.

I'm happy that I've raised six kids, and not one of them is a Ph.D.

I like people who are working on practical things and who are working in teams. It's not so important to get the glory. It's much more important to get something that works. It's a better way to live.

The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence.

Aviation is the branch of engineering that is least forgiving of mistakes.

It's amazing how much progress there's been in China, and also India. Those are the places that really matter - they're half of the world's population. They're the places where things are enormously better now than they were 50 years ago. And I don't see anything that's going to stop that.