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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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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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The average office desk has 400 times more bacteria on it than a toilet.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.