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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.