We [with Bill Gates] started to make decisions about what we'd invest in. Then I actually started traveling for the foundation. I've probably been to India now eight times at least and Africa numerous times.

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.

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.

Women speaking up for themselves and for those around them is the strongest force we have to change the world.

If you can't go to secondary school, the boys get to go and the girls don't, you're locked into a cycle of poverty, because you don't have a chance.

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

I am inspired by the women I meet everywhere I go. They have to work so hard just to make sure their families survive, but somehow they stay optimistic and do everything in their power to make the future better than the past.