Poverty disproportionately affects women around the world.

Abortion has become a very politicised issue that I think countries have to work out themselves. In a lot of countries, people can't even yet agree on what their laws should be.

When I look at 225 million women who want contraceptives, and then I look at the 52 million unintended pregnancies that could be avoided by addressing this unmet need, where can we have the biggest impact with our voice, our dollars, our partners? It's on contraceptives. I would rather address the problem upstream.

Now, as smartphones are coming up, there are all kinds of apps that will start to be developed that will help women.

All of a sudden people in the United States start to realize that vaccines make a difference. The controversy and the myth that's there, we're always trying to bust through that. So when I see a disease outbreak, I say to myself, "OK, that'll get people realizing how lucky we are to have vaccines."

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.

If you don't invest in the woman, empower her, give her the things she needs to lift her family up, you're just not going to make the progress that you want to make. But if you put her at the centre, you can change a lot for that family, and it has ripple effects through the economy.