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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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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.