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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.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.