Exposure from a young age to the realities of the world is a super-big thing.

It is hard to overstate how valuable it is to have all the incredible tools that are used for human disease to study plants.

The kids are a big part of my schedule.

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

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.

Personally, I'd like to see more of our leaders take a technocratic approach to solving our biggest problems.

In most of these things our foundation is a co-funder, so I can say that a polio or an HIV vaccine, that I'm putting our resources behind it in a very big way and the U.S. government would be the best partner for those efforts.