UMM RUWABA, Sudan -- Farmers here call these sandblasted acacia orchards the "gardens of our grandfathers," and for centuries the sticky amber sap flowing from them helped to bind civilization.
A piece of chewed birch bark tar gum unearthed in western Sweden has unlocked a window into ancient life, revealing the oldest known human DNA in the region. First excavated in the early 1990s from ...
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