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Did you know?
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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Everyone has one nostril that is larger than the other.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.