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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.