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Did you know?
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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The horizontal fraction bar was introduced by the Arabs.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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Medication errors are more common among seriously ill patients than with those with minor conditions.