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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.
The average adult has about 21 square feet of skin.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
There are more bacteria in your mouth than there are people in the world.
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