I always say when you see that old black-and-white footage of the rocket on the launch pad and it falls over and explodes, that's because people had slide rules. Not having the decimal point is a real drawback. You want the decimal point, take it from me.

The world's going to change climatically. We just want to control the change. We want to have a high quality of life for billions of people as we pass through this era.

When we see the shadow on our images, are we seeing the time 11 minutes ago on Mars? Or are we seeing the time on Mars as observed from Earth now? It's like time travel problems in science fiction. When is now; when was then?

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

You stop planetary exploration, those people who do that extraordinary work are going to have to go do something else.

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

Talk about science with everyone you meet. Especially talk about climate change. It needs to become a part of our everyday conversation (the way it is everywhere else in the world).