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

Women and girls face a whole host of issues. We start with health, so we work very deeply on maternal deaths, making sure that a mom doesn't die in childbirth, making sure that she has access, for instance, to AIDS medication.

My undergraduate work was in computer science and economics. It just happened to be at that time when 34 percent of computer-science majors were women. We didn't realize it was at the peak at the time.

As a parent, the responsible thing to do - if you love your child - is to vaccinate your child.

Even in decision-making, we work in self-help groups. That is women coming together in small groups of 10 to sometimes 15 women, where they start to get education about their rights, about clean water and sanitation, about how to have a healthy birth. You can bring in all kinds of education to them that way.

I've travelled extensively in the last 16 years - to slums in Bangladesh, to townships in South Africa, to all kinds of places in India, etc. When I would go and talk to villagers about something like vaccines, if I stayed long enough, the women would bring the conversation around and say: "What about this family planning tool? We can't keep having the number of children we're having."

Philanthropy is not about the money. It's about using whatever resources you have at your fingertips and applying them to improving the world.