Vaccination is pretty special because you can do a vaccination campaign anywhere in the world. All you are doing is gathering women from the villages, getting them the vaccines and asking them to go around and find the children.

I believe the government has the right to recover from the heirs to the fortunes of its most successful citizens some portion of those fortunes.

Looking at these issues as a businessman, I believe that investing in the world's poorest people is the smartest way that our government spends money.

One thing I've always loved about the culture at Microsoft is there is nobody who is tougher on us, in terms of what we need to learn and do better, than the people in the company itself. You can walk down these halls, and they'll tell you, 'We need to do usability better, push this or that frontier.'

Energy is very primal stuff and there are a lot of leads that are promising, still at a fairly risky stage, but over the next decade some of these breakthrough approaches are going to pay out, and U.S. research and U.S. leadership on this should be part of how it gets solved.

Robots will play an important role in providing physical assistance and even companionship for the elderly.

Music, even with these dial-up connections you have to the Internet, is very practical to download.