I remember thinking quite logically that I didn't want to spoil my children with wealth and so that I would create a foundation, but not knowing exactly what it would focus on.

China adopted a capitalist system in the 1980s, and they went from a 60% poverty rate to 10%.

This whole phenomenon of the computer in a library is an amazing thing.

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.

It's hard to improve public education - that's clear.

When I say "miracle" I mean a kind of thing like a computer on a chip, or the internet, or the cellphone, that are really quite miraculous. Most people would not have predicted them, and their effect has been very, very dramatic.

So we do software for watches, for phones, for TV sets, for cars. And some of these take a long time to catch on.