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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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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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The longest a person has survived after a heart transplant is 24 years.
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There are 60,000 miles of blood vessels in every adult human.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.