This week I will be blogging Mara Hvistendahl's Unnatural Selection: Choosing Boys Over Girls, and the Consequences of a World Full of Men.
The shortage of women in many Asian and Eastern European countries does have some silver linings.
In India, the need for brides is leading to some cross-caste marriages that would have been unthinkable a generation or so ago.
In East Asia, "foreign brides" make up so large a percentage of new marriages that old national prejudices are being modified or even given up.
The poor women who marry out of poor countries, such as Vietnam, into developing countries can make a better life for their children than they could have at home.