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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.