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There are 20 feet of blood vessels in each square inch of human skin.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are more bacteria in your mouth than there are people in the world.