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How we first discovered the difference between XX and XY

Throughout history people puzzled over what exactly determined a whether a baby would be a boy or a girl. Theories tended to range from the woman's diet, to the ambient temperature of the room. Until one woman, studying mealworms, finally determined what was the difference between little girls and little boys. » 11/18/12 8:00am 11/18/12 8:00am