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There are 60,000 miles of blood vessels in every adult human.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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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.