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Did you know?
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The human body produces and destroys 15 million blood cells every second.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.