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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Everyone has one nostril that is larger than the other.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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There are more bacteria in your mouth than there are people in the world.
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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.