Running is my addiction. It's always present. I'm constantly thinking about my next run.

What drives me is that moment of discovery. I love the unknown.

I think a human animal is far more wild and unpredictable and dangerous and destructive than any other animal.

Running is my addiction. It's always present. I'm constantly thinking about my next run.

I'm really worried about what the world is going to be like when my daughters are young women, [when] they are young leaders or mothers or businesspeople - whatever they're going to be. I'm afraid they're going to have a less healthy and less biologically rich planet.

In my heart, ever since I [was] a little kid, I've been an explorer.

The challenge is that we live in a time where there's a lot of crap on television.