I'm surprised to see this ranking so high on HN. Sex-based difference is the biggest taboo of our time. The current educational and political system is organized toward exclusively presenting the view that gender is a cultural construct and there are no differences between men and women other than plumbing. Men and women, on average, differ significantly on career choice, likes, dislikes, and motivation. And, it has…
What's in dispute is that there has been any reasonable natural experiment that has had the power to show that women have any functional cognitive differences with men. This is due to 1) the influence of pervasive beliefs in both experimenters and subjects that women are inferior to men (in often contradictory ways with specifics that vary by culture and over time), and 2) the actions of both men and women who subscribe to those beliefs to punish women for deviating from them. These beliefs are part of a large corpus colloquially known as "common sense," which purport to describe what is "obvious" but tend to simply defend what daddy said from the communists at the university.
The Saudis believe that driving is physically and mentally harmful to women. Dr. Pangloss believes that everything is as it should be.
edit: In addition, I doubt that the study that took place in a bubble that excluded or properly controlled for the influence of overt sexism and anti-female suppression was a group of Scottish IQ tests from 1932. 21 year-old Scottish women had been allowed to vote for at least three years by then. Get with the program you nurturers!
edit2: And to go on forever about this, I'll say how shocked I am to discover that a class of people who were constrained to a certain narrow range of education in a certain narrow range of practical skills intended to lead them to a certain narrow range of outcomes have test scores that tend towards a more narrow range than people outside that class.