Some have argued that there is statistically more variation among men than among women, which means that even though the average man is no more intelligent than the average woman, there are more men of extremely low intelligence and more men of extremely high intelligence. At the far ends of the bell curve where the overlap ends, they say, the difference becomes clear. This may have been the basis for the controversial point made by Harvard president Lawrence Summers in 2005 when he was hunting for explanations for why there are so many more male than female science professors at top
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