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The average office desk has 400 times more bacteria on it than a toilet.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The human body produces and destroys 15 million blood cells every second.