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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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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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The human body produces and destroys 15 million blood cells every second.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.