Some air you inhale was exhaled by Cleopatra.

The center line of science literacy - which not many people tell you, but I feel this strongly, and I will go to my grave making this point - is how you think.

Seventy percent of Earth's surface is water and over 99 percent is uninhabited, so you would expect nearly all impactors to hit either the ocean or desolate regions on Earth's surface. So why do movie meteors have such good aim?

Curiosity is a self-driven motivation to explore and to learn. Learning is like... you know, you have to take your medicine. And that is what it has become. And that's unfortunate.

Science is not just a topic we can step around or ignore.

I'm not writing for myself. I'm writing as an educator, I'm writing to stimulate others.

Astronauts are the only kind of celebrity I know who can have a line of people waiting for their autograph, even if the line of people does not know in advance the astronaut's name.