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What can direct-to-consumer genetic companies tell us about our health and ancestry? How do scientists figure out which genes affect particular traits? Is Art related to a Nigerian prince? Is Marty a Neanderthal? On this episode of Big Biology we talk with Samantha Esselmann and Ruth Tennen, product scientists at 23andMe, about how the company uses its massive trove of data to help people learn about the genetics of their ancestry and health. We talk about the accuracy of results and what the numbers in their reports say about us. Samantha and Ruth work closely with 23andMe’s population geneticists and content writers to develop engaging scientific content for 23andMe's health reports and educational initiatives. Samantha has a PhD in Neuroscience from UCSF. Ruth got her PhD in Cancer Biology from Stanford and served as a science policy fellow at the State Department.