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There are 20 feet of blood vessels in each square inch of human skin.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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There are more sensory neurons in the tongue than in any other part of the body.
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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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Excessive alcohol use costs the country approximately $235 billion every year.