Dinosaurs grew feathers for heat regulation, but the ones that started flying started becoming birds.

The first art in caves were really psychedelic experiences, and the reason that they were is because the tribal encyclopedia, the amount of information that people needed to know in order to move to a new way of life, suddenly increased over that period of time.

We've got a planet in which we don't want to have everybody having sex, and most people are lonely anyway.

One thing we didn't know in 1996 is that it's very, very difficult, if not impossible, to sustain a culture with online advertising.

Technological civilization has now dominated the earth to the point where there is a big question what is going to happen next.

Of course, with agriculture came the first big civilizations, the first cities built of mud and brick, the first empires. And it was the administers of these empires who began hiring people to keep track of the wheat and sheep and wine that was owed and the taxes that was owed on them by making marks; marks on clay in that time.

I've spent my life alone in a room with a typewriter.