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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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Thyroid conditions may make getting pregnant impossible.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.