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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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There are more sensory neurons in the tongue than in any other part of the body.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.