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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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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, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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