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Ancient teeth pose a mystery: What made those strange grooves?

New research on ancient human remains suggests the habitual usage of betel nuts, a plant seed with mind-affecting properties that is popular in parts of Asia despite the health risks it presents.

Ancient teeth pose a mystery: What made those strange grooves?

We haven't written up this one. NPR has the full story — the link below goes straight to it.

Also reported by 1 other outlet

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