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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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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The human body produces and destroys 15 million blood cells every second.
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Approximately 25% of all reported medication errors result from some kind of name confusion.