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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Medication errors are three times higher among children and infants than with adults.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.