Bronze‑Age IQ Shift Hypothesis

A proposition that regional differences in average IQ scores among Eurasian populations largely crystallized in the last several thousand years (Bronze‑Age through the pre‑modern era) rather than being solely a product of very recent (20th‑century) environmental change. Testing it requires combining ancient‑DNA, archaeological indicators of social complexity, and modern cognitive/phenotype datasets to time when selective or amplification processes plausibly acted. — If true or seriously entertained, it reframes debates about heredity vs environment, informing immigration, education and research priorities and changing how historical causation is invoked in public policy.