More boys than girls are born, but sex ratio differs at conception

[news]

http://i.cbc.ca/1.3016162.1427808263!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/fraternal-twins-boy-and-girl.jpg Every year, slightly more boy babies than girl babies are born worldwide. Is that because more boys are conceived? A new study uncovers a surprising answer.


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