Computers and games don't waste time - people do.

Today, we're very dependent on cheap energy. We just take it for granted - all the things you have in the house, the way industry works.

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

Whenever you have a few setbacks, the idea that half as many children are dying now as back in 1990 and so... it was over 12 million a year, now it's less than 6 million a year. We have a clear path to get that under 3 million a year and we know what to do. And this generation of young Africans is a very large group.

If you are born poor its not your mistake, But if you die poor its your mistake.

Humanity’s greatest advances are not in its discoveries – but in how those discoveries are applied to reduce inequity.

The government's ability to select scientists and pick things that are fairly strange, because politicians don't like failures. They're only in office a short term, and many of these things take a long time.