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it's nature. i forget the bio term for it but it's been pretty well established. put bl & wh. rats in a box and they'll sort by color. animals look to align themselves along similar traits. diversity means mutation means the possible end of your species. it's in your atomic makeup.
as for the kid, she's 5. she chose the one most similar as good and the one most different as bad. well, no shit.
i swear this study pops up in different forms every few years during slow news cycles.
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