When you revolutionize education, you're taking the very mechanism of how people be smarter and do new things, and you're priming the pump for so many incredible things.

Some very poor countries run great vaccination systems, and some richer ones run terrible programs.

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

Money has no utility to me beyond a certain point.

I went public too soon. Stay private as long as you can.

I try to make time for reading each night. In addition to the usual newspapers and magazines, I make it a priority to read at least one newsweekly from cover to cover. If I were to read what intrigues me- say, the science and business sections - then I would finish the magazine the same person I was when I started. So I read it all.

Think of business as a good game. Lots of competition and a minimum of rules. You keep score with money.