From one piece David Reich – Bronze Age shock, the Neanderthal puzzle, & the sudden spread of farming 4 beliefs, in the piece's order there
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And so one possible explanation for that is just that there's only a handful of generations maybe five over which the natural selection would operate. And so maybe if the selection was 2% a generation you would still only see maybe a 10% compounded effect and there's just not enough time to detect it. But the Bronze Age is not 300 years, it's 3,000 years. It's the power of compound interest and you have enough time to begin to see a strong effect.
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but it is the tracer dye, right? Like it tracks into European languages and important aspects of Indo-European culture are coming through Yamnaya.
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And so, maybe what you're seeing is that this group of people in Europe and the Middle East over the last 10,000 years has moved into a a period of relatively more stable food, where building up stores of fat are not as advantageous, and there's been selection against this combination of traits.
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So we just could not see a way this could happen by chance and once we saw that we really felt quite convinced that this was a real signal and that really somehow there has been natural selection to increase the genetic changes that today manifest themselves as more years of school at predicting more years of schooling.