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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The horizontal fraction bar was introduced by the Arabs.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.