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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.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.