Mouthful of clues: Barium in teeth advances study of weaning among Neanderthals, early humans

Did a shift in the way infants were weaned give early humans an evolutionary advantage over their Neanderthal cousins? Scientists have long speculated that a change to earlier weaning played a key role in human development, but they have been stymied in efforts to prove such theories by the lack of an accurate record for comparing weaning ages in both species.

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