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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 longest a person has survived after a heart transplant is 24 years.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.