Derek Kite’s blog about gender mentions Leonard Sax. I feel I have to chip in with a a warning: Sax’s book “Why Gender Matters: What Parents and Teachers Need to Know About the Emerging Science of Sex Differences.” has been widely exposed as pseudoscience of the worst kind.
Sax is anecdotal, overinterprets his sources and more. He has a political agenda: he is the premier proponent of single sex education. The “science of sex differences” is mostly on the same intellectual level as “Men are from Mars, Women from Venus”.
Don’t read Sax (at least not seriously): read Language Log