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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The average office desk has 400 times more bacteria on it than a toilet.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.