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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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Medication errors are three times higher among children and infants than with adults.
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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.