In this 1930, file photo, a nurse holds a baby in the nursery of the Pennsylvania Hospital in Philadelphia. Every year, slightly more boy babies than girl babies are born. But back when sperm meets egg, the two sexes are conceived in equal numbers, according to a new study released on Monday, March 30, 2015. The finding contradicts the idea found in many textbooks and scientific articles that males predominate at conception, researchers said. (AP Photo/File)
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