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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.