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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").