The person who did the most to dismantle the variability hypothesis was

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Leta Stetter Hollingworth did the most to dismantle the variability hypothesis, which suggested that men have a wider range of physical and mental development than women, and thus are more likely to be geniuses (or feebleminded). Hollingworth's research and arguments provided significant evidence against this hypothesis, emphasizing that observed differences were not due to biological sex but rather to social and environmental factors.

The Person Who Did the Most to Dismantle the Variability