one I remember is a much larger set of communication paths between the two brain hemispheresThat one's extremely contentious. A lot of studies have found no difference: some have found a small difference: the few that found large differences turned out not to be using autopsies and forgot to correct for gender-dependent variables like average age at death.
It seems likely that if the corpus callosum size varies between sexes it varies in the same way as do most other gender-dependent parameters not directly associated with the reproductive tract and lactation: a variation between the sexes much smaller than the average variation between members of each sex.
It seems to me extremely implausible that a parameter could exist which could cause software development to be 97% male in some countries but >50% female in some others (which is what we see). This is surely cultural.
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