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Did you know?
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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The average adult has about 21 square feet of skin.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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There are 20 feet of blood vessels in each square inch of human skin.