From brain and heart pacemakers to prosthetic limbs, artificial parts have revolutionized medicine. Pacemakers are implanted to aid control of a particular body part. The artificial pacemaker controls the heartbeats while the brain pacemaker includes deep brain stimulators, which send electrical impulses to the brain in order relieve depression, epilepsy, and tremors. As of May 2008 more than 40,000 patients worldwide had received the brain pacemaker. (Reuters/ AP)
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