"When Rush Limbaugh says I'm not a scientist, I'm charmed - I smirk." — Bill Nye

Evolution is a theory, and it's a theory that you can test. We've tested evolution in many ways. You can't present good evidence that says evolution is not a fact.

If you have this idea that the earth is only 6,000 years old, you are denying, if you will, everything that you can touch and see. You're not paying attention to what's happening in the universe around you.

What makes the United States great, the reason people wanted to live in the United States, move here still, is because of our ability to innovate.

When one shows up in jeans and a T-shirt, I strongly feel that the audience reacts in a very different way than when you show up in a sport coat and a tie.