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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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.