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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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 first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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In 1864, the first barbiturate (barbituric acid) was synthesized.