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Lord Sebjenseb (sebjenseb.net) solved the IQ Question btw
As for why do nearly genetically identical populations in different countries have different IQ - genetics are fickle, and g is determined by a very small number of genes. So, inscrutable differences can cause varying results. Current IQ results are basically entirely dependent on the "did you have some sort of eugenic selection in the last 200 years" modifier.
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