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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.
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There are 20 feet of blood vessels in each square inch of human skin.