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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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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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The longest a person has survived after a heart transplant is 24 years.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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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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