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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%