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

Where did the concept of "without borders" come from? No one had that concept until you saw Earth from space, illustrated not by a mapmaker who's color-coding political boundaries; it's illustrated by nature itself and there's land, there's ocean, there's atmosphere.

I try to keep this in mind when tied in to a rope 75 feet up in a tree... The history of ideas about our place in the universe has been a long series of let-downs for those who like to believe we are special.

Modern science is under no obligation to satisfy the expectations of your five senses.

Not only do we live among the stars, the stars live within us.

All Plutophiles are based in America. If you go to other countries, they have much less of an attachment to either the existence or preservation of Pluto as a planet.

The typical person has no trouble believing without knowing. What people need to realize is simply that you do not need to believe to know.