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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 first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.