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There are 20 feet of blood vessels in each square inch of human skin.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.