I've heard it said that the most dangerous animal on the planet is the adolescent male.

Poverty is too complex to be answered with a one-size-fits-all approach, and if there is any place that illustrates that complexity, as well as a better way forward, it is Rwanda.

If there's one value that is immutable, it's integrity or respect, for others and for yourself.

Monsters will always exist. There's one inside each of us. But an angel lives there, too. There is no more important agenda than figuring out how to slay one and nurture the other.

You should focus on being more interested than interesting.

Sometimes the most important things that we do are things we cannot measure.

We can send people to the Moon; we can see if there's life on Mars - why can't we get $5 [mosquito] nets to 500 million people?