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There are approximately 3 million unintended pregnancies in the United States each year.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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.