An international group of researchers has sequenced the genomes of Late Upper Paleolithic (13,300 years old) and Mesolithic (9,700 years old) males from western Georgia in the Caucasus and a Late Upper Paleolithic (13,700 years old) male from Switzerland. In doing so, they have revealed a previously unknown fourth strand of ancient European ancestry. Hunter-gatherers. Image credit: T.P.S. Dave. The newly discovered lineage stems from populations of...
