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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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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 cases in Americans are about 75% higher today than they were in 1980.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.