Some people, through luck and skill, end up with a lot of assets. If you're good at kicking a ball, writing software, investing in stocks, it pays extremely well.

I would certainly use my voice to try and avoid anything that undermines confidence, so that parents are using vaccines fully.

For all these infectious diseases, the goal is to eventually get rid of them. And to do that we need to invent new tools, but nobody was doing that because there was no money to buy on behalf of the poorest, even the existing tools.

With Windows 8, Microsoft is trying to gain market share in what has been dominated by the iPad-type device. But a lot of those users are frustrated. They can't type. They can't create documents.

Globalization has made copper and other minerals more valuable, and Ghana and Kenya have recently discovered mineral resources.

The first five years have so much to do with how the next 80 turn out.

If you give people tools, and they use their natural abilities and their curiosity, they will develop things in ways that will surprise you very much beyond what you might have expected.