Many of the wars we see around the world start as domestic conflicts that are fueled by external forces and powers. My view is that we can help peace if we help communities transform from the inside, on their own terms.

For many child soldiers, war and violence are all they have ever known. If we don't take it upon ourselves to show them an alternative, then they're going to be soldiers forever, and they'll continue to be recruited and to participate in violence if another conflict starts five or 10 years down the road.

I've been trying to understand conflict and violence ever since I was a kid. You know. There were a few things that happened even on my block - the Black Panthers used to be right around the corner from where we were.

While it's easy for South Sudan to feel distant, the situation is all too real for the South Sudanese mothers choosing which child gets to eat tomorrow. This is a time when we must look outward together and declare that humanity has no borders - no one deserves to suffer like this, especially in a world of such abundance.

It's a mystery, that thing about chemistry, because often people who hate each other in real life and hate each other on the set have great chemistry on the screen. And people who love each other in real life and love each other on the set have absolutely no chemistry whatsoever.

When all is said and done, science actually takes hard work and a willingness to sometimes find out that your most cherished hypothesis is wrong.

Putting together philosophy and children would have been difficult for most of history. But very fortunately for me, when I started graduate school there was a real scientific revolution taking place in developmental psychology.

I don't know - it's a bit of a mystery of how things come about when they do. I don't have a scientific explanation for it. Sometimes when you're writing a song, you don't know where you're going.