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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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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.