Capitalism has worked very well. Anyone who wants to move to North Korea is welcome.

As we have taken diarrhea and pneumonia down, even malaria down quite a bit, the portion of the days that are very early in that 5 years - the first month, the first day - it's about half now. Yet that's the part we understand the least.

Leaders are those who empower others.

We should all grow our own food and do our own waste processing, we really should.

The bulk of the universities are about teaching kids.

I believe innovation is the most powerful force for change in the world. People who are pessimistic about the future tend to extrapolate from the present in a straight line. But innovation fundamentally shifts the trajectory of development.

Well-spent aid money is saving lives for a few thousand dollars per life saved.