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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
There are 60,000 miles of blood vessels in every adult human.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
The horizontal fraction bar was introduced by the Arabs.
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