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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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The human body produces and destroys 15 million blood cells every second.