"I am convinced that the conquest of space will benefit all mankind."

"I'm a natural-born optimist. I believe that we're going to solve all our problems."

"My father was a sportsman and a hunter, and he taught me to shoot when I was very young. I was always interested in what made things go."

"Crash programs fail because they are based on the theory that, with nine women pregnant, you can get a baby a month."

"Failure is not an option."