If that X is a dim one, they fall. Progress and War, Feast and pogoms, inquistions and Art, and of course everyday crime. They have a safety net, they take less risk. If she has one dim X chromosome, she has another one to fall back on which would make her smarter than her idiot brother. That's why women are more likely to be average in intelligence to each other and stable.
Women provide the stability in the movement of humankind.
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