Like Spencer Ackerman, I'm having trouble believing this was actually published -- it's a long argument by Charlotte Allen in The Washington Post in favor of the proposition that women are dumb. That's no exaggeration, that's what the piece is about. Plus: frenology:
Men's and women's brains not only look different, but men's brains are bigger than women's (even adjusting for men's generally bigger body size).
Presumably if we left Allen out of the sample, things might look different.