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Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.