President [George] Bush made the U.S. absolutely the leader, between its own PEPFAR, and it's been by far the biggest Global Fund donor. That's a legacy.

Common Core is a big win for education.

Harnessing steam power required many innovations, as William Rosen chronicles in the book 'The Most Powerful Idea in the World.'

The intersection of law, politics, and technology is going to force a lot of good thinking.

China has many successful entrepreneurs and business people. I hope that more people of insight will put their talents to work to improve the lives of poor people in China and around the world, and seek solutions for them.

The general idea of the rich helping the poor, I think, is important.

The moral systems of religion, I think, are super important.