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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The human body produces and destroys 15 million blood cells every second.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.