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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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There are 20 feet of blood vessels in each square inch of human skin.