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Did you know?

There are 20 feet of blood vessels in each square inch of human skin.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

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The horizontal fraction bar was introduced by the Arabs.

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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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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