The first humans who settled in Scandinavia more than 10,000 years ago left their DNA behind in ancient chewing gums, which are masticated lumps made from birch bark pitch.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/05/190515085450.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/05/190515085450.htm
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