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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are more sensory neurons in the tongue than in any other part of the body.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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Cyanide works by making the human body unable to use oxygen.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.