They believed that prediction was just a function of keeping track of things. If you knew enough, you could predict anything. That's been cherished scientific belief since Newton.' And?' Chaos theory throws it right out the window.

Let's be clear. The planet is not in jeopardy. We are in jeopardy. We haven't got the power to destroy the planet - or to save it. But we might have the power to save ourselves.

We all live every day in virtual environments, defined by our ideas.

The purpose of life is to stay alive. Watch any animal in nature--all it tries to do is stay alive. It doesn't care about beliefs or philosophy. Whenever any animal's behavior puts it out of touch with the realities of its existence, it becomes exinct.

I believe my life has a value, and i don't want to waste it thinking about clothing. I don't want to think about what i will wear in the morning. Truly, can you imagine anything more boring than fashion?

Life is wonderful. It's a gift to be alive, to see the sun and breathe the air. And there isn't really anything else.

The past history of human belief is a cautionary tale. We have killed thousands of our fellow human beings because we believed they had signed a contract with the devil, and had become witches. We still kill more than a thousand people each year for witchcraft. In my view, there is only one hope for humankind to emerge from what Carl Sagan called "the demon-haunted world" of our past. That hope is science.