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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.