Where do you really come from? And how did you get where you are today? Our guest this hour, Dr. Spencer Wells and the National Geographic’s Genographic Project are tracing the pathways of human migration through DNA. According to recent research, all humans descended from a group of African ancestors who began a remarkable journey about 60,000 years ago. Dr. Wells is in town to lecture this evening at Bishop Dunne High School’s 2007 GeoTech Conference.