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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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