Digital reading will completely take over. It's lightweight and it's fantastic for sharing. Over time it will take over.

In the decade ahead I can predict that we will provide over twice the productivity improvement that we provided in the '90s.

Nobody spends any money on smallpox unless they worry about a bio-terrorist recreating it.

With tech companies, whoever's the leader is always questioned, you know. They say, 'Is this the end of them?' And - there's more - more times people think that's the case than it really is the case.

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.

The world has been very careful to pick very few diseases for eradication, because it is very tough.

I'm a great believer that any tool that enhances communication has profound effects in terms of how people can learn from each other, and how they can achieve the kind of freedoms that they're interested in.