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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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Cyanide works by making the human body unable to use oxygen.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.