Ancient DNA Shows Natural Selection Accelerated During the Bronze Age
David Reich argues that recent human evolution was not dormant after the rise of agriculture but unusually active, especially in and around the Bronze Age. In a discussion of new ancient-DNA work with Ali Akbari, Reich says a large West Eurasian dataset shows widespread directional selection over the past 10,000 to 18,000 years after controlling for migration, drift and admixture. The strongest signals involve immune and metabolic traits, but Reich also reports substantial movement in polygenic scores linked today to cognition, education, pigmentation and body fat, while cautioning that those modern predictors are difficult to interpret in ancient societies.
Dwarkesh Patel·May 8, 2026·27 min read
