Photo: Odd Skull Boosts Human, Neandertal Interbreeding Theory

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A modern human skull recovered from a bear cave in Romania shows a groove at the base, just above the neck muscle, that is ubiquitous in Neandertal specimens but has never been seen in the remains of a modern human.

Some scientists say this is more evidence for Neandertal-human interbreeding. But not everyone agrees with the controversial theory.

Image courtesy Current Anthropology/University of Chicago Press

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