In a two-part paper published in the journal Trends in Genetics, Stanford University researcher Gerald Crabtree suggest that evolution is, in fact, making us dumber—and that human intelligence may haveactually peaked before our hunter-gatherer predecessors left Africa.The reason?
Life on the veldt was tough, and prehistoric humans’ genes were constantly subjected to selective pressure in an environment where the species’ survival depended on it.
For humans, that meant getting smarter.
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