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Looking around the world today, I’d place my bets it was due to more fucking and more violence.
Selection for juvenile traits – low aggression, openness to novelty and new people – likely made us more social, and produced our immature-looking skulls as a side-effect. Ironically, it may have been this sociability and low aggression that made modern humans so incredibly dangerous to these primitive Homo sapiens.
So we partied the others to death?
It’s always violence
more important is the fact that large tribes are better able to defend land – or take it.
In this case it sounds more like cats, infiltrating with cuteness instead of conquering with violence.