Mankind's Genetic Origins [12min @15:43]

Where do we actually come from? That is the question that the National Geographic Genographic Project has been trying to answer. By collecting DNA samples from people all over the world, the project is trying to unlock the secrets to humankind's ancestral past. To explain how genetic differences can tell us about how humanity spread around the globe, Quentin Cooper is joined by Spencer Wells, director of the Genographic project, and Mark Thomas from the Centre for Genetic Anthropology at University College London.