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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.