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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.