I think given all the different imperatives - getting energy to Africa, security of energy, climate change, that we should be spending half as much as we spend on health, which will get you all the way up to $15 billion - the health people don't like it when things get compared to their number.

I'm quite worried about the fiscal imbalances that we've got and what that might mean in terms of financial crisis ahead.

I went public too soon. Stay private as long as you can.

Every new change forces all the companies in an industry to adapt their strategies to that change.

Giving money effectively is almost as hard as earning it in the first place.

About three million computers get sold every year in China, people don't pay for the software. Someday they will, though. And as long as they're going to steal it, we want them to steal ours. They'll get sort of addicted, and then we'll somehow figure out how to collect sometime in the next decade.

Nigeria has moved into low-middle-income, but their north is very poor, and the health care systems there have broken down.