With a Drop of Saliva, Family Histories Are Rewritten Widespread DNA testing has shed light on the ancestry of millions of Americans. But these services have limitations, and the results can be uncertain. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Trilobites: The Gooey Details Behind a Glow Worm’s Starry Night IllusionsTrilobites: Visualizing the Invisible Drivers of Climate ChangePolar Bears’ Path to Decline Runs Through Alaskan VillageMassive planet-eating ‘DEATH STAR’ discovered by scientistsClimate Change News That Stuck With Us in 2016Large Hadron Collider could discover mysterious dark matter and unlock 'parallel universe'