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There are approximately 3 million unintended pregnancies in the United States each year.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.