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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are more sensory neurons in the tongue than in any other part of the body.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The average adult has about 21 square feet of skin.