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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The longest a person has survived after a heart transplant is 24 years.
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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.