What is al Qaeda? It's an open source religious political movement that works off the global supply chain.

The great thing about cheap natural gas, again it's cheap, and it provides a cleaner alternative to coal. But it's still a fossil fuel, and because it's still a fossil fuel, it still emits carbon.

Big breakthroughs happen when what is suddenly possible meets what is desperately needed

I am being very humble about the Arab Spring. There's kind of a competition out there, you might have noticed, of who can be the first to say the Arab Spring is going to fail. Everyone says, "I told you so, I told you so about the Muslim Brotherhood." I have no desire to tell anyone anything. I don't know. I'm just listening, watching. It may turn out all these people are right, they may be wrong. They may be right this year and wrong next year, by the way. I'm just trying to listen day to day, figure it out.

The philosopher Ludwig Wittgenstein once remarked that if you ask a man how much is two plus two and he tells you five, that is a mistake. But if you ask a man how much is two plus two and he tells you ninety-seven, that is no longer a mistake. The man you are talking to is operating with a wholly different logic from your own.

What about the rest of life? Respect for the sanctity of life, if you believe that it begins at conception, cannot end at birth.

When you study history and look at every civilization that has grown up and died off, they all leave one remnant: a major sports colosseum at the heart of their capital. Our fate can be different; but only if we start doing things differently.