Basically, I'm a perpetual student. I start by finding a subject I really don't know very much, but that I'm curious about. I learn about it through books in a library, by doing interviews with people who know a lot about the subject, and by going out on my own and seeing for myself what's happening.

The people designing the weapons literally often didn't know how they were being handled in the field by the Air Force - and a lot of people in the Air Force didn't understand some of the dangers. There's a very strong element of madness in this.

The United States now has more prison inmates than full-time farmers.

The obesity epidemic among American children is becoming so bad that I think there's a growing realization across the country that we've got to change what we're feeding our kids and that school may be a really good place to start.

Yes, a cheeseburger and fries is probably my favourite meal. But I don't eat ground beef anymore.

Fast food is popular because it's convenient, it's cheap, and it tastes good. But the real cost of eating fast food never appears on the menu.

I think for real change to happen, it's going to have to come from the kids, the community, the teachers, the parents.