It is still just unbelievable to us that diarrhea is one of the leading causes of child deaths in the world.

Women are the centre of the family. It's the woman who decides what's eaten in the house, when to have the kids vaccinated; everything that has to do with the children's health revolves around her.

Sometimes it's the people you can't help who inspire you the most.

Like in Africa, if somebody doesn't have fuel, they're still going and collecting firewood. If they get an oven, that's a huge difference. You can do things to reduce the inequities by making sure that they can get clean energy, safe energy. To make sure they're not having to collect water every day. That's huge for women in the developing world.

Everyone agrees that the failure of our high schools is tragic. It's bad business, and it's bad policy. But we act as if it can't be helped. It can be helped. We designed these high schools; we can redesign them.

In the United States, there's definitely some controversy about birth control in general, and I think we needed to split the debate and have people realize that we actually agree as a country about contraceptives. Over 93 percent of American women say they use contraceptives, and they feel very good about it.

I'm happy we have three healthy children and we'll stay with three healthy children.