We make the future sustainable when we invest in the poor, not when we insist on their suffering.

Paul and I, we never thought that we would make much money out of the thing. We just loved writing software.

Taking a look back, one big reqret is, I left Harvard with no real awareness of the awful inequities in the world. The appalling disparities of health and wealth and opportunity that condemned millions of people to the lives of despair. I learned a lot here at Harvard about new ideas and economics, and politics. I got great exposure to the advances being made in the sciences. But humanities greatest advances are not in its discoveries, but in how those discoveries are applied to reduce inequity.

Well-spent aid money is saving lives for a few thousand dollars per life saved.

Now everyone takes it for granted that you can look up movie reviews, track locations, and order stuff online. I wish there was a way we could take it away from people for a day so they could remember what it was like without it.

According to Ethiopian custom, parents wait to name a baby because children often die in the first weeks of life.

Every day were saying, 'How can we keep this customer happy?' How can we get ahead in innovation by doing this, because if we don't, somebody else will.