-the prevailing assumption is that men and women have virtually identical intellectual profiles

-this simply not the case...many more women than men have intellects that lie in the normal range
[historically, there are very sound biological reasons why]

-the intellectual profile for men has more variability, showing that  many more men have above average intellects; and the ratio favouring men increases dramatically  with higher values

-adding to that,  brighter women [and there are many]are generally not  so interested in STEM careers

-as dictated by the politics of our time, there has been a general 'dumbing down' of our society...a post graduate degree is no longer  necessarily a true  indicator of 'superior' intellectual prowess
    -'equality of opportunity' has been  replaced by 'equality of outcome'