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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.