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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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In 1864, the first barbiturate (barbituric acid) was synthesized.