Creating a Map of Human History Through Our DNA - Spencer Wells

When they left Africa 50,000 to 60,000 years ago, humans took very different paths. Some went east to Asia, and others went north and west to Europe. But in the meantime, many stopped and became better acquainted with their Neandertal cousins in the Middle East. National Geographic Explorer-in-Residence Spencer Wells has developed the Genographic Project to map man's genetic history, and decode our DNA to map man's route through history. He also is capable of calculating the percentage of Neandertal in each person's genetic past.