If we’d stayed on all fours, women’s pelvises could have remained bigger. Without the pelvis limiting brain size, our intelligence might have had more built-in, “brittle” smarts, specific to a particular environment, but less fluid intelligence

If we’d stayed on all fours, women’s pelvises could have remained bigger. Without the pelvis limiting brain size, our intelligence might have had more built-in, “brittle” smarts, specific to a particular environment, but less fluid intelligence NAUTILUS