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There are 20 feet of blood vessels in each square inch of human skin.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.