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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 average adult has about 21 square feet of skin.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.