Common sense tells me the conclusions in this article are not the best. Ms Soh would have been better to have studied the most successful hackers in the world  China and Russia.  When I went to University in Canada in the early sixties there were quotas on students in regards to gender, ethnicity, religion and land of origin. This culminated in a tragic massacre of 14 young women Engineering students at the Montreal Poytechnique on Dec 6, 1989 by a male who felt he was more worthy than they.  From 1942-45 most Medical Graduates in Canada went into the Canadian Army. So in my day you went to a quota type Dr because they had to be at the top of their class, and to an ex-army surgeon as they had  a lot of practice.  Dexterity here and in lots of jobs would also be a consideration.  There is probably no  real scientific reason for what has gone on in Google.