I am acquainted with a neurophysicist who maintains that it is breezingly easy, when reading brain scans, to determine which images reflect the skull-mush of a homo-sapien female, as compared to the skull-mush of a homo-sapien male.

This is because, so says the neurophysicist, scans of the female brain reveal many folds: folds being the way information in the brain is stored. And human females are interested in many things. Thus: many folds.