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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.