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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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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%