What a 5,700-Year-Old Wad of Chewed Gum Reveals About Ancient People and Their Bacteria
When hunter-gatherers living in what is now southern Denmark broke down pieces of birch bark into sticky, black tar about 5,700 years ago, they almost certainly didn’t realize that they were leaving future scientists their entire DNA. Ancient people used the gooey birch pitch to fix arrowheads onto arrows and to repair a variety of…
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