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Everyone has one nostril that is larger than the other.
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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.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.