We can't start over and develop a Saturn 5-type vehicle from scratch.

The final frontier may be human relationships, one person to another.

Long-term, I see robotics prevailing on the moon. . . . The most important decision we'll have to make about space travel is whether to commit to a permanent human presence on Mars. Without it, we'll never be a true space-faring people.

I didn't start skiing until I was 50. My wife Lois taught me how to ski. I'm proficiently conservative.

It's been one of the greatest challenges that ever came along in my life; it was one of the more difficult things to do.

I inherited depression from my mother's side of the family.

Dwelling on an engine failure for a pilot as he rolls down the runway is NOT what he should be thinking about - it's obtaining a smooth liftoff! But in the back of his mind, he knows exactly what to do (or pretty much) and in many cases, if he's alone in the fighter aircraft, he has to leave that aircraft in an ejection seat in a big hurry!