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The horizontal fraction bar was introduced by the Arabs.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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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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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.