Sex-selection has yielded an imbalance of 160 million more males than females throughout the developing world--in China and India, but also in Vietnam and Korea, among other countries. In her first book, Unnatural Selection: Choosing Boys Over Girls, and the Consequences of a World Full of Men, Mara Hvistendahl, Beijing Correspondent for Science Magazine, argues that sex selection is spreading as countries develop and that development leads to falling fertility rates which in turn increases pressure on women to make their first or second child a boy.

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