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Marksmen were the first place I looked and I actually didn't find an association. Will talk more about this at length, but the mechanism seems to be that brown eyed people have faster reactions, even auditory reactions. Blue eyed men excel at making delayed, deliberate decisions
Blue eyes are advantageous for tasks that mentally resemble a game of chicken: turning the steering wheel not too soon and not too late. The tendency not to do the first, obvious thing is likely linked to the marked shyness displayed by blue eyed children.
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