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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.