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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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There are 20 feet of blood vessels in each square inch of human skin.