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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The human body produces and destroys 15 million blood cells every second.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).