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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 is approximately twice as thick as water because of the cells and other components found in it.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.