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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.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.