I was sold on flying as soon as I had a taste for it.

I think sometime we will go to Mars and I think we'll explore it with humans sometime, but I think it's really wise to do all the robotic exploration ahead of time and learn as much as possible. Once we have learned as much as possible with the robots, then that's the time to send people, and let them then continue the research that the robots have started.

Americans just want us to... not be concerned if they can be constitutionally justified... Why, if we had to do that we could not pass most of the laws we enact around here.

That was a real fireball.

This is a day we have managed to avoid for a quarter of a century. We've talked about it before and speculated about it, and it finally has occurred. We hoped we could push this day back forever.

I think in America we have to get back to being the best educated general citizenry in the world and make sure we do not lose our lead in research, if we're to have a leadership position in the world.

If there is one thing I’ve learned in my years on this planet, it’s that the happiest and most fulfilled people I’ve known are those who devoted themselves to something bigger and more profound than merely their own self interest.