Our blood holds the secrets to who we are. Human genomes are 99.9 percent 6 ; we are far more similar than diverse. But that tiny 0.1 percent difference reveals 7 to our ancestries. In recent years, as companies have sprung up claiming to trace one’s background through genetic testing, tens of thousands of people have swabbed their cheeks and mailed in their DNA to discover more about where they came from. 8 cousins are finding each other; family legends are being overturned. Six years ago the term “genetic genealogy” was meaningless, says Bennett Greenspan, head of Family Tree DNA, a testing firm with 52,000 customers. “Now the interest is huge.”
As individuals track down their personal family narratives, population geneticists are seeking to tell the larger story of humankind. The most ambitious effort 9 is the National Geographic Society’s $40 million Geographic Project, which aims to collect 100,000 DNA samples from 10 populations around the world over the next five years. The goal: to trace human roots from the present day back to the origin of our species. To create, says project director Spencer Wells, “a virtual museum of human history.”
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