Stone Age Superglue Found -- Hints at Unknown Smarts?

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Stone Age humans were adept chemists who whipped up a sophisticated kind of natural glue, a new study says.

They knowingly tweaked the chemical and physical properties of an iron-containing pigment known as red ochre with the gum of acacia trees to create adhesives for their shafted tools.

Archaeologists had believed the blood-red pigment—used by people in what is now South Africa about 70,000 years ago—served a decorative or symbolic purpose.

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