RAGING hormones during pregnancy prompt mood swings, but may also lead to a heightened ability to recognize threatening or aggressive faces. This may have evolved because it makes future mothers hyper-vigilant, yet it could also make them more vulnerable to anxiety.
Source : New Scientist
http://www.newscientist.com/article/mg20427384.200-pregnant-women-develop-emotionreading-superpowers.html
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