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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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There are more bacteria in your mouth than there are people in the world.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.