Alan Feingold has given us, in addition to an interesting analysis of data, a historical account of work on the variability His account is, however, oddly neutral. It mentions objections raised by feminists and others against the hypothesis, but it leaves out the social history that aroused fiery passions and induced feminists to call it a pernicious hypothesis. I have been given some space to fill out that side of the story.
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Nel Noddings (1992) studied this question.
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