I try to make time for reading each night. In addition to the usual newspapers and magazines, I make it a priority to read at least one newsweekly from cover to cover. If I were to read what intrigues me- say, the science and business sections - then I would finish the magazine the same person I was when I started. So I read it all.

I've always been interested in science - one of my favourite books is James Watson's 'Molecular Biology of the Gene.'

In the U.S., we believe the best way to improve lives is to improve public education.

Cutting through complexity to find a solution runs through four predictable stages: determine a goal, find the highest-leverage approach, discover the ideal technology for that approach, and in the meantime, make the smartest application of the technology that you already have - whether it's something sophisticated, like a drug, or something simpler, like a bednet.

The quality of research in the U.S. is absolutely the best.

If I hadn't given my money away, I'd have had more than anyone else on the planet.

We all have the chance to create a world where extreme poverty is the exception rather than the rule.