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Author Question: From observations of workplaces in the United States, Frank Levy and Richard Murnane determined that ... (Read 219 times) |
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?
The average adult has about 21 square feet of skin.
Did you know?
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.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.