A group of geneticists have been pursuing a 10-year study into how the human race came to populate the world. This program explains this "global family tree" of all humans alive today, ultimately tracing back to one African man who lived fewer than 60,000 years ago. Hosted by Dr. Spencer Wells, a charismatic and compelling 31-year- old American scientist, the series explores this amazing discovery, along with the help of expert scientists, historians, archaeologists and anthropologists.