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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
The longest a person has survived after a heart transplant is 24 years.
The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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