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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.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.