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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The average office desk has 400 times more bacteria on it than a toilet.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.