I read an hour almost every night. It's part of falling asleep.

Even when things are stable, that's not easy [to work in Africa] because there are not roads, and the weather is tough, the education system hasn't been there. But this is how you get great countries, is step by step.

In the US in the 1900's 60 % of people were employed on the farms. Today it's less than 1%. If you told people back then that this would happen they wouldn't have believed it. If you told them we would have therapy, massages and spas that played important parts in our lives they would've have believed us.

Internet TV and the move to the digital approach is quite revolutionary. TV has historically has been a broadcast medium with everybody picking from a very finite number of channels.

We have two other countries, Pakistan and Afghanistan - again it's the instability that is a problem there. So over the next several years, we expect to drive the number of [polio] cases back down to zero because that is likely to be the second disease after smallpox that we completely eradicate.

I have been struck again and again by how important measurement is to improving the human condition.

Until we're educating every kid in a fantastic way, until every inner city is cleaned up, there is no shortage of things to do.