Depression, migraine and addiction: Can magnetic brain stimulation help?
  In the 1700s, an Italian physician figured out how to perform an eerie parlor trick. Luigi Galvani hung frog legs from a metal railing. Then, atmospheric electricity energized the severed limbs, causing them to dance and kick. These Frankenstein-like experiments did more than captivate an audience. Eventually, they helped scientists understand how electrical impulses power human nerve...
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