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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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The horizontal fraction bar was introduced by the Arabs.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.