What About Biological Explanations?

I got all excited when I read the following article title in the week's issue of PNAS:

Abnormal sex ratios in human populations: Causes and consequences

I hoped the authors would discuss meiotic drive and segregation distortion. It turns out they're concerned with son preference and sex-selective abortion. I guess stuff like this doesn't really interest them.

More like this

Sorry for the light blogging this week. Finals are this week and next, and so I'm pretty swamped. Today I'm going to pose a straightforward but slightly counterintuitive probability question, of the sort that in modified forms aren't so uncommon in physics:
(Since Iâve actually been away from the computer all week, these links are all to posts from the previous week. Feel free to add some of this weekâs must-read blog posts in the comments.)