When Rush Limbaugh says I'm not a scientist, I'm charmed - I smirk.

Everybody who's a physician, who makes vaccines, who wants to find the cure for cancer. Everybody who wants to do any medical good for humankind got the passion for that before he or she was 10.

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.

NASA is an engine of innovation and inspiration as well as the world's premier space exploration agency, and we are well served by politicians working to keep it that way, instead of turning it into a mere jobs program, or worse, cutting its budget.

Television isn't inherently good or bad. You go to a bookstore, there are how many thousands of books, but how many of those do you want? Five? Television's the same way. If you're going to show people stuff, television is the way to go. Words and pictures show things.

If the Earth gets hit by an asteroid, it's game over. It's control-alt-delete for civilization.