Stone Age humans chewed birch bark pitch, or birch tar, to make a glue-like paste that could be used for tool construction and other kinds of technology. Photo by Jorre/Wikimedia Commons/CC
May 15 (UPI) -- Scientists have recovered human DNA from 10,000-year-old chewing gum found in Sweden. The DNA is the oldest to be sequenced from the region.
Researchers found the masticated lumps of birch ...
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