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The human body produces and destroys 15 million blood cells every second.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.