Brain Power 12:23 This story was first published on Nov. 2, 2008. It was updated on Aug. 6, 2009. Once in a while, we run across a science story that is hard to believe until you see it. That's how we felt about this story when we first saw human beings operating computers, writing e-mails, and driving wheelchairs with nothing but their thoughts. Quietly in a number of laboratories, an astounding