Prehistoric ‘chewing gum’ sheds light on Stone Age diet
STOCKHOLM, Jan 28 — DNA from a type of “chewing gum” used by teenagers in Sweden 10,000 years ago is shedding new light on the Stone Age diet and oral health, researchers said Tuesday. The wads of gum are made of pieces of birch bark pitch, a tar-like black resin, and are combined with saliva, … Read more