Video: Paralyzed Rats Walk Again, Now Farther Than Ever

Like a severed telephone line (from back in the days when phones had wires), a spinal cord injury can cut off communication between the brain and the rest of the body -- leaving a victim unable to move some or all of his or her limbs. It's one of the leading causes of paralysis in the United States, and the debilitating effects often can be permanent. 

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