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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.