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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Cyanide works by making the human body unable to use oxygen.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.