drunken_boxer777 writes: Researchers at the University of Wisconsin-Madison have developed a method to guide human embryonic stem cell (hESC) differentiation to heal damaged mouse brains. Not only were the hESC-derived neurons capable of forming synaptic connections, they were able to correct memory and learning deficits. The article has a paywall (abstract here), but a well-written summary can be found here.
Cue the Pinky and the Brain jokes...
"Card readers? We don't need no stinking card readers."
-- Peter da Silva (at the National Academy of Sciencies, 1965, in a
particularly vivid fantasy)