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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.