Philanthropy should be taking much bigger risks that business. If these are easy problems, business and government can come in and solve them.

Really advanced civilization is based on advances in energy.

I do think this next century, hopefully, will be about a more global view. Where you don't just think, 'Yes, my country is doing well,' but you think about the world at large.

I really had a lot of dreams when I was a kid, and I think a great deal of that grew out of the fact that I had a chance to read a lot.

There was a magical breakthrough when the computer became cheap and we could see that everyone could afford a computer.

A top-quartile teacher will increase the performance of their class - based on test scores - by over 10 percent in a single year. ... That means that if the entire U.S., for two years, had top-quartile teachers, the entire difference between us and Asia would go away.

I never took a day off in my twenties. Not one. And I'm still fanatical, but now I'm a little less fanatical.