How art augments a global walk

National Geographic Explorer Paul Salopek has been walking across continents for his project, the Out of Eden Walk. He describes that project as an exercise in what he calls "slow journalism." But as he explains, journalists often see the world in a very different way than artists often do. That's why it's been important to him to walk with artists along his journey. He tells Host Marco Werman what that adds to the project, and about the Out of Eden Walk art exhibitions he has hosted.