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Did you know?
The average adult has about 21 square feet of skin.
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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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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.