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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Your heart beats over 36 million times a year.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.