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On average, the stomach produces 2 L of hydrochloric acid per day.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.