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Did you know?
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Did you know?
Excessive alcohol use costs the country approximately $235 billion every year.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
There are more bacteria in your mouth than there are people in the world.