Alvin Powell in The Harvard Gazette:Human history is rife with contentions about the purity (and superiority) of the bloodlines of one group over another and claims over ancestral homelands. More than a decade of work on ancient human DNA has upended it all. “Ancient DNA is able to peer into the past and to understand how people are related to each other and to people living today,” Reich said during a talk at the Radcliffe Institute for Advanced Study. “And what it shows is worlds we hadn’t imagined before. Help keep us going by donating now.