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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.