If you say to people that there's less violence today than in the past, they would be stunned to hear that. But it's the truth, even though we have awful things happening in Syria or Sudan.

In the U.S., we believe the best way to improve lives is to improve public education.

Billionaires should never be responsible for solving problems, because they're not the government.

We need to look at less obvious paths, things like the wind in the jet stream, which is very high up. The material science of what type of kite string you would need to connect up to that. That's still at the basic research level.

(On being the world's richest man) I wish I wasn't ... There's nothing good that comes out of that. You get more visibility as a result of it.

When you have a product that has zero sales, it is easy for people to say whatever they want about it and almost fantasize about it.

Make it just like a Mac.