We set out what's going to be our work time versus our foundation time versus family time, and we'll reassess that... sometimes every week.

If you can't travel to the developing world, look at helping to fund a woman with a small loan and follow her. Learn her story. Learn about the difference that you're making.

Bill [Gates] and I believe philanthropy can only be effective if it starts things and proves whether they actually work or not. That's the place that governments often don't want to, or can't, work.

That's universal - we all want to bring every good thing to our children. But what's not universal is our ability to provide every good thing.

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.

In the developing world, they don't have smartphones yet. They have the older plastic phones, but women are saving money on those, because they don't have access to banks. Having that access to digital money changes everything for her because she actually doesn't have to negotiate with her husband, which she will tell you is very hard in these circumstances, especially when the means are meager. She's expected to have money to pay for the kids' health or to help with the school fees.

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