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Asthma cases in Americans are about 75% higher today than they were in 1980.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Illicit drug use costs the United States approximately $181 billion every year.