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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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 horizontal fraction bar was introduced by the Arabs.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.