"Rocket science is tough, and rockets have a way of failing."

"I was always very interested in science, and I knew that for me, science was a better long-term career than tennis."

"The experience of being in space didn't change my perspective of myself or of the planet or of life. I had no spiritual experience."

"Science is fun. Science is curiosity. We all have natural curiosity. Science is a process of investigating. It's posing questions and coming up with a method. It's delving in."

"Observation is a passive science, experimentation an active science."

"There must be a positive and negative in everything in the universe in order to complete a circuit or circle, without which there would be no activity, no motion."

"We must be willing to pay inspiring math and science teachers, who have high paying alternatives in industry, more to teach and reward students who take more challenging courses in high school."

"Science cannot tell theology how to construct a doctrine of creation, but you can't construct a doctrine of creation without taking account of the age of the universe and the evolutionary character of cosmic history."