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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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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.