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Greater than the sum of our parts: The evolution of collective intelligence - Phys.org

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The New York Times
SOURCE: https://phys.org/news/2021-06-greater-sum-evolution-intelligence.html
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Summary

The period preceding the emergence of behaviourally modern humans was characterized by dramatic climatic and environmental variability?it is these pressures, occurring over hundreds of thousands of years that shaped human evolution.

As said here by Science X staff