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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.