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Our body is a machine that works day and night. Even when we are sleeping, our body is busily working. Most of this activity is internal, and we do not feel it. For example, our kidneys are continually excreting fluid. They filter over 180 quarts of different fluids. All through the day, our body is destroying and replacing cells n the blood. On the average day, the body destroys 250 million red blood cells.
Outside of the body, things are happening, too. We are constantly blinking our eyes and they become clean. Our hair grows about two hundredths of an inch every day. Finally, our skin is changing. The outer layers of the skin are constantly drying and flaking off. During our lifetime we wash and scratch off more than 40 pounds of dead skin.