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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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There are 20 feet of blood vessels in each square inch of human skin.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).