Are humans getting smarter even as our brains shrink? Research suggests brain size may have decreased by about 10% since the Holocene era, but this doesn’t mean intelligence has declined. Experts studying Homo sapiens say brain size is only weakly linked to intelligence — factors like brain structure and connectivity matter more.
Scientists propose several reasons for this shift, including changes in lifestyle after agriculture, warmer climates, and the rise of collective intelligence, where knowledge is shared across society.
Rather than becoming less intelligent, humans may have evolved to rely more on culture, technology, and collaboration to think and solve problems.
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