Science is the key to our future, and if you don't believe in science, then you're holding everybody back.

Recommending or insisting on abstinence has been completely ineffective.

I am so old, I entered engineering school with a slide rule. And I left engineering school with a calculator. I can still use a slide rule but it's not a skill you especially need anymore.

To leave the world better than you found it, sometimes you have to pick up other people's trash.

Hard to find anything lovelier than a tree. They grow at right angles to a tangent of the nominal sphere of the Earth.

From an evolutionary standpoint you can't just wipe everything out and start over, and I don't think you can do it in the school system either.

There's nothing I believe in more strongly than getting young people interested in science and engineering, for a better tomorrow, for all humankind.