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Did you know?
The human body produces and destroys 15 million blood cells every second.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.