The prehistoric birch tar found in Estonia contained traces of saliva that were analysed by genetics experts The prehistoric birch tar found in Estonia contained traces of saliva that were analysed by genetics experts A piece of stone age “gum” chewed by a teenage girl 10,500 years ago has been discovered by archaeologists in Estonia . The Institute of History and Archaeology at the University of Tartu discovered the prehistoric birch tar had impressions of teeth marks and traces of saliva. The

Tag-uri: DNA