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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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The longest a person has survived after a heart transplant is 24 years.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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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.