If you ask, who has the chance to move into the city and get a good job out in the developing world? It's a man. Who's left to care for the kids back at home? The woman is.

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

I realized that the only way to get into a good college was to be valedictorian or salutatorian. So that was my goal.

The biggest pieces of work that we do are vaccines, because those save lives, and also family planning. Because if a woman can space the births of her children, it changes everything for her health and her child's health.

Childbearing, I mean, if there's no place to go to deliver your baby, then you're the one that's delivering in those unhealthy circumstances. Or if you can't get access to family planning, your chances of surviving and being able to bring your kids up if they come one right after the other, that locks you into a cycle of poverty.

Despite the debunking, you have a small group in the last five years that hasn't wanted to vaccinate their children, for instance, for measles. Then, all of sudden, we got an outbreak of measles and kids were starting to die from measles.

Men make different investments than women do. Women tend to invest more of their earnings than men do in their family's well-being - as much as 10 times more.