You don't look back along time but down through it, like water. Sometimes this comes to the surface, sometimes that, sometimes nothing. Nothing goes away.

We battled in secret, undeclared, and after a while I no longer fought back because I never won. The only defense was flight, invisibility.

Science is not something that exists apart from human beings. It's one of the things we do as human beings, and we always have done science and technology in some form.

The darkness is really out there. It's not something that's in my head, just. It's in my work because it's in the world.

If all fossil fuel were to go POOF! tomorrow, the result would be a cataclysmic social upheaval, with food riots, warlords, shutdowns, breakdown of social order, water shortages, and outbreaks of bloodshed and disease.

The best way of keeping a secret is to pretend there isn't one.

Storytelling is a very old human skill that gives us an evolutionary advantage. If you can tell young people how you kill an emu, acted out in song or dance, or that Uncle George was eaten by a croc over there, don't go there to swim, then those young people don't have to find out by trial and error.