At an ancient boneyard, a bridge to early global wanderers

On a years-long hike across the globe, journalist Paul Salopek is following the path humans took after the Ice Age. One of the most important human migration sites in the world is in Dmanisi, Georgia, where people have walked for nearly 2 million years. Hari Sreenivasan joins Salopek in learning more about the first pioneers to wander that part of the world.