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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.