Archaeologists were stunned when, about a decade ago, they uncovered an underwater Stone Age burial dating to about 8,000 years ago in Sweden. This burial contained the battered skulls of 11 adults and one infant, but only two of those individuals — one adult and the infant — had jaws. Two of the jawless skulls had been placed on stakes that, during the Stone Age, had stuck out of the lake.

Curiously, there were plenty of other jawbones in the burial, but they belonged to animals, including those of brown bears, wild boars, red deer, moose and roe deer.

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