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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).