January 17, 2018 | Silicon Valley ancestry-testing firm 23andMe, whose CEO spoke last week at the JPM Healthcare Conference, claims to have DNA from more than 2 million consumers, and its spit tests for insights into family history and health were top sellers on Amazon this past holiday season, but its ancestry test and those from three other companies produced drastically different results, a new report said. In yesterday's original story at Gizmodo, a reporter compared her family's ancestry results from four service providers including 23andMe. The Mercury News followed up with more questions.