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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.