If you take from the most wealthy and give to the least wealthy, it's good. It tries to balance out.

The general idea of the rich helping the poor, I think, is important.

The advance of technology is based on making it fit in so that you don't really even notice it, so it's part of everyday life.

Exposure from a young age to the realities of the world is a super-big thing.

We all need people who will give us feedback. That's how we improve.

With polio, we've gone several years with no polio in all of Africa, but now with this we're having to go and mop up in that whole region, so it's a bit of a setback for polio. So in parallel we have to go back and get rid of those cases.

Sometimes, I think my most important job as a CEO is to listen for bad news. If you don't act on it, your people will eventually stop bringing bad news to your attention and that is the beginning of the end.