As you may know, I am a mechanical engineer.

Everyone you will ever meet knows something you don't.

We are just a speck, on a speck, orbiting a speck, in the corner of a speck, in the middle of nowhere.

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

Science is the best idea humans have ever had. The more people who embrace that idea, the better.

You and I are made of stardust. We are the stuff of exploded stars. We are therefore, at least 1 way that the Universe knows itself. That, to me, is astonishing.

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

I speak with dogs frequently. They don't really talk, but I feel they're communicating.

The natural world is a package deal; you don't get to select which facts you like and which you don't.

The more you find out about the world, the more opportunities there are to laugh at it.

Science is the best thing humans beings have ever come up with. And if it isn't, science will fix it.

Learn to resist but do not be un-moveable in your resistance. Resist like the water.

Be nice. And if you can't do that, just don't be mean.

Negative feelings weigh you down and can keep you from experiencing healing, as surely as stones might weigh you down if you were trying to swim.

Because it doesn't matter anymore, and because I'm so desperately lonely I can't stand it.

In the summer heat the reapers say, “We have seen her dancing with the autumn leaves, and we saw a drift of snow in her hair.

I actually lost both my legs. I can walk because I got really good health care.

You can never quit. Winners never quit, and quitters never win.

What is most contrary to salvation is not sin but habit.

We . . . declared our independence 200 years ago, and we are not about to lose it now to paper shufflers and computers.

I am honored to have this role [of the moderator], but this evening belongs to the candidates and, just as important, to the American people.