New – Sunday, April 3 at 10 p.m.
What can DNA testing companies reveal about our ancestry and health, and at what risk?
Some 30 million people have sent their DNA to be analyzed by companies like 23andMe and AncestryDNA. But what happens once the sample is in the hands of testing companies, and how accurate are their results? NOVA explores the power of genetic data to reveal family connections, ancestry, and health risks—and even solve criminal cold cases. But alongside the benefits of these rapidly growing genetic databases are serious unintended consequences.
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