Why are girls so mean to other girls 
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The connection between the dorsomedial prefrontal cortex and amygdala is weaker in women than men. dmPFC is involved in cognitive processes (perception, emotions, reasoning) and amygdala is threat detection. Biologically and subconsciously, women treat other women as competition.
*citation needed (Your cum-stained copy of 12 Rules for Life does not count)
