But the improvements will happen faster and last longer if we can channel market forces, including innovation that's tailored to the needs of the poorest, to complement what governments and nonprofits do. We need a system that draws in innovators and businesses in a far better way than we do today.

Me and my dad are the biggest promoters of an estate tax in the US. It's not a popular position.

The pace of progress in biology creates a foundation that naturally gets picked up by the biotech and pharmaceutical industry to solve rich-world diseases. This is attractive science. It's science that people want to work on.

Looking at these issues as a businessman, I believe that investing in the world's poorest people is the smartest way that our government spends money.

We're all responsible for creating a polio-free world while we still can.

I can understand wanting to have millions of dollars; there's a certain freedom, meaningful freedom, that comes with that.

That way you can be certain to learn something you didn't know previously.