JonLaw, with all due respect, I really don't think there is any evidence whatsoever that women's brains have physically shrunk or gotten stupider or anything due to sexism and are now "catching up."

Again, I'm going to point to the fact that 50 years, or even 100 years, is a MICROBLEEP in evolutionary time. If we have seen big changes in girls' test scores over that time, we are NOT talking about evolution. We are talking about cultural change.