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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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People about to have surgery must tell their health care providers about all supplements they take.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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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.