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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.