The more testosterone a man has, the less likely he is to hang around to help bring up baby http://www.economist.com/news/science-and-technology/21679772-chang

The more testosterone a man has, the less likely he is to hang around to help bring up baby http://www.economist.com/news/science-and-technology/21679772-changes-mans-testosterone-level-show-kind-parent-he-will-be-pot-luck http://www.economist.com/news/science-and-technology/2167977...