Men's brains are more variable than women's in a number of dimensions, including volume and surface area https://academic.oup.com/cercor/advance-article/doi/10.1093/cercor/bhy109/4996558#116717118 …pic.twitter.com/8uFqJGrmR5
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Mentioned the "greater male variability" hypothesis to a neuroscience prof once. He supposed the process of masculinization in the womb ("we all start as female") introduces variability. 