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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.