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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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There are approximately 3 million unintended pregnancies in the United States each year.