A hit-and-run accident five years ago left Rob Summers paralyzed from the waist down. Doctors said he would never walk again, but thanks to a new type of therapy, he can now stand on his own. Summers' injury disrupted t...

A brain-machine interface has been developed that...  ...n years by a brain stem stroke was implanted with electrodes five years ago. Researchers waited as the brain g...  .... Researchers waited as the brain grew around the electrodes . Three years after implantation, the researchers...