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Excessive alcohol use costs the country approximately $235 billion every year.
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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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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.