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.

Everyone agrees that the failure of our high schools is tragic. It's bad business, and it's bad policy. But we act as if it can't be helped. It can be helped. We designed these high schools; we can redesign them.

I went to business school, and I went straight from that to a nine-year career at Microsoft. Eventually, I ran a big chunk of the consumer products division for Microsoft.Then I left with the birth of our first daughter because Bill and I both wanted to have a few kids.

Human-centered design. Meeting people where they are and really taking their needs and feedback into account. When you let people participate in the design process, you find that they often have ingenious ideas about what would really help them. And it’s not a onetime thing; it’s an iterative process.

The fact that 98 percent of women in [the U.S.] who are sexually experienced say they use birth control doesn't make sex any less sacred. It just means that they're getting to make choices about their lives.

The biggest killers of children around the world are two things: diarrhea and pneumonia. When you think about it, in the United States, kids don't die of diarrhea anymore, but it's a huge problem in the developing world.

We have to be careful in how we use this light shined on us.