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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.