Well, no one gives aid to Zimbabwe through the Mugabe government.

I was announcing to the public, in 2006, that I'd be leaving Microsoft in a couple of years and focusing full-time on the foundation. That was the time at which we went back to New York and Warren [Buffett] announced these gifts to a number of foundations, with a very high percentage of it going to us and basically doubling our capacity.

Thinking about impact on children meant adding to the agenda, both the R&D agenda and the delivery agenda, but it's amazing news, even in the scale of other tragedies.

You know capitalism is this wonderful thing that motivates people, it causes wonderful inventions to be done. But in this area of diseases of the world at large, it's really let us down.

Software is inherently complicated. If you say to somebody I want an airline reservation system, to really say what you want in terms of overbooking and fares, and different airlines communicating with each or schedule changes, it's immensely complex. And so you can't write a program that's any simpler than that full specification.

India is more of an aid recipient than a provider of aid.

Whether you believe it a moral imperative or in the rich world's enlightened self-interest, securing the conditions that will lead to a healthy, prosperous future for everyone is a goal I believe we all share.