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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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 horizontal fraction bar was introduced by the Arabs.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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The familiar sounds of your heart are made by the heart's valves as they open and close.