The best scientist is open to experience and begins with romance - the idea that anything is possible.

You've got to be able to look at your thoughts on paper and discover what a fool you were.

We've let too much time go by. We've been busy with war instead of being busy with peace. And that's what space travel is all about. It's all about peace and exploration and wonder and beauty.

I can write faster on a typewriter than you can on a computer. I do 120 words a minute, and you can't do that on a computer.

The whole concept of higher education is negated unless the sole criterion used to determine if students qualify is the grades they score on standardized tests. Education is purely an issue of learning - we can no longer afford to have it polluted by damn politics. Leave pollution up to the politicians

Don't talk about it; write.

Space travel is life-enhancing, and anything that's life-enhancing is worth doing. It makes you want to live forever.