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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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The average adult has about 21 square feet of skin.