Rich countries can afford to overpay for things.

Nuclear energy, in terms of an overall safety record, is better than other energy.

Effective philanthropy requires a lot of time and creativity - the same kind of focus and skills that building a business requires.

The ideal thing would be to have a 100 percent effective AIDS vaccine. And to have broad usage of that vaccine. That would literally break the epidemic.

I feel pretty stupid that I don't know any foreign languages. I wish I knew French or Arabic or Chinese.

The idea of explaining why free trade is good, why immigration is good, why the world is so connected, that we need to think in terms of humanity and being generous to each other, you know, that's proving to be a challenge.

In the philanthropy game, you're going for different outcomes: saving childhood lives, having kids grow up - because they don't have malnutrition or disease - that they achieve their full potential. We take for Warren [Buffett] things that, because he's very intelligent about the world but doesn't get to go out in Africa and see what we see, we've taken and say to him where we stand and it's basically a very positive report that his gift has made a phenomenal difference.