The one thing I regret was that my work required an enormous amount of my time, and a lot of travel.

Research is creating new knowledge.

I guess we all like to be recognized not for one piece of fireworks but for the ledger of our daily work.

Fear is not an unknown emotion to us.

We have no proof, But if we extrapolate, based on the best information we have available to us, we have to come to the conclusion that ... other life probably exists out there and perhaps in many places.

All in all, for someone who was immersed in, fascinated by, and dedicated to flight, I was disappointed by the wrinkle in history that had brought me along one generation late. I had missed all the great times and adventures in flight.

History will remember the twentieth century for two technological developments: atomic energy and space flight.