The next time someone tells you we can trim the budget by cutting aid, I hope you will ask whether it will come at the cost of more people dying.

If you withdraw the incredible focus on polio, it will spread back, and in poor countries you'll get something like 100,000 cases a year. So by being very intense and getting the cases down to zero, what you do is you avoid all the future cases.

I do normal kind of contributions, particularly for people who are going over to Africa and help highlighting global health, and that's tended to be pretty bipartisan in nature because of the coalition there exists fortunately around these global health issues. But I don't think my backing, putting a lot of money into political contributions is a way I'm going to try and help improve the world.

We all know that there are these exemplars who can take the toughest students, and they'll teach them two-and-a-half years of math in a single year.

It's pretty incredible to look back 30 years to when Microsoft was starting and realize how work has been transformed. We're finally getting close to what I call the digital workstyle.

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

Treatment without prevention is simply unsustainable.