Achievement, Genetics, and Gender

Eugene Volokh has had some threads discussing the old topic of woman/man differences in scholarly achievement and their possible basis in genetics. See the last one here.
Because the discussion started when I was still doing catch-up, I'll restrict my comments to these points:

• often such threads assume that one can make points about genetic influences by pointing to American data, as if "women" and "American women" were the same. We need to look across countries, across time, and across subcultures.
  
• one possibility for a genetic influence would be an observed differential in risk-taking behavior as reported yesterday. It says: "Young men all over the world have higher death rates than women because of their riskier lifestyles, researchers said yesterday.Accidents and suicide are the leading killers in men 15 to 34 years old; deaths from heart disease, cancer and chronic liver disease rise sharply in those 35 to 44." So maybe men are more willing to go for broke career-wise by working harder and exploring more risky hypotheses? (Females are more mature?)
  
• finally, the Scientific American runs a story on chess experts which suggests that it's study and more study rather than "genius" that gets you to the grandmaster status.