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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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There are more sensory neurons in the tongue than in any other part of the body.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.