Well, guess what? He's back!
And this time, he concludes that women are more stupid than men
Well, there are a lot of things that I could say, but let's start with the obvious one-track critique: Umm...HELLO test bias!? Your standard IQ tests (which I'll assume, unless proven otherwise, were used) are well-established to be biased in favor of white, (upper) middle class MALES. Not to mention that the way in which the study is presented to those females tested could cause them to underperform.
Also, I can't help wondering if the populations tested were actually representative. It's already known that males tend to skew more very high and very low on the bell curve, whereas women cluster more toward the middle. Did he randomly select that cohort of 17-18 year olds from a census, or did he only test those with at least enough mental capacity to function in a normal high school?