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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).