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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are more sensory neurons in the tongue than in any other part of the body.