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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.