I'm so suspicious of our own understanding of the past. I just think that your mind plays absolute tricks on you and fools you every minute of every day. And so when you're talking about the past, you're talking about something that never happened. At least it didn't happen the way you think it happened.

I don't take investment advice from wealth managers. I have grown several businesses from scratch and amassed many millions from my publishing empire - why would I take advice from someone who has never experienced that?

The rich are not a contented tribe. The demands from others to share their wealth become so tiresome, so insistent, they often decide they must insulate themselves. Insulation eventually breeds a mild form of paranoia.

America is not the center of the universe.

There is a history of thinking about space science from an environmental ethics perspective. And part of what I want to do is turn that back and use that experience to see if it reflects how we think about the Earth.

If you can reach out and touch and love and be with wildlife, you will forever be changed, and you will want to make the world a better place.

I have to say that if our global alliances are going to be alliances with Hezbollah and Hamas and Hugo Chavez's Venezuela and Vladimir Putin's Russia, there is absolutely no chance of building a world-wide alliance that can deal with poverty and inequality and climate change and financial instability, and we've got to face up to that fact.

There are two sides, at least, to most political questions, and a politician's impulse may be to believe that the same holds true for science. Certainly, there are disputes in science. But on the question of climate change, the divide is stark.