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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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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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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.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.