Well, it's taken time to get this going, but he was right. If you give people a chance to associate themselves with a cause they care about, while buying a great product, they will. That was how the RED Campaign was born, here in Davos.

I have a particular relationship with Vinod Khosla because he's got a lot of very interesting science-based energy startups.

Computer science … jobs should be way more interesting than even going to Wall Street or being a lawyer--or, I can argue, than anything but perhaps biology, and there it's just a tie.

In terms of fast food and deep understanding of the culture of fast food, I'm your man.

I regret being the richest man in the world because that position attracts undeserved publicity.

There's 20 companies that I have investments in - some batteries, some solar-thermal, one big nuclear thing. We need hundreds and hundreds of companies like that, so that in a 20-year time frame we really are starting to change the energy infrastructure.

Think of business as a good game. Lots of competition and a minimum of rules. You keep score with money.