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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.