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Vaccines prevent between 2.5 and 4 million deaths every year.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.