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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.