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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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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.