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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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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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Everyone has one nostril that is larger than the other.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.