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.

I meet so many people who are intimidated by arithmetic.

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?

History is but the record of the public and official acts of human beings. It is our object, therefore, to humanize our history and deal with people past and present; people who ate and possibly drank; people who were born, flourished and died; not grave tragedians, posing perpetually for their photographs.

My father was a very good Boy Scout. He was very skilled with knots, and he showed me how to tie a bow tie.

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

Hard to find anything lovelier than a tree. They grow at right angles to a tangent of the nominal sphere of the Earth.