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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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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The average adult has about 21 square feet of skin.