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Lead in Ancient Teeth: Key to Human Evolution?

10/24/2025

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Summary

Story summary

Researchers analyzed fossilized human teeth dating to over two million years ago and found lead in 73% of specimens.
Lead exposure is linked to brain development changes, notably NOVA1 variant dysfunction in FOXP2 related to speech.
The study suggests this exposure shaped neurosocial pathways and may have given modern humans an advantage over Neanderthals.
Some scientists criticize the findings as speculative due to the limited fossil sample.

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Story summary

Researchers analyzed fossilized human teeth dating to over two million years ago and found lead in 73% of specimens.
Lead exposure is linked to brain development changes, notably NOVA1 variant dysfunction in FOXP2 related to speech.
The study suggests this exposure shaped neurosocial pathways and may have given modern humans an advantage over Neanderthals.
Some scientists criticize the findings as speculative due to the limited fossil sample.