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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.