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it’s a complication and a maturity upgrade for my genetic drift theory, but it would answer your opening question if my Spanking Gene first appeared in an earlier form among the farmers, and then morphed into to those horsemen from the steppes later.
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The idea is about an aggressive gene, like everyone became an alpha or something - and maybe a farm is an alpha’s kingdom, and it’s territorial . . . but again, evolution, his kids are probably beaten slaves and evolving to be ever more aggressive, again until they go from farming to burning farms . . . hmmmm
