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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.