By Sharon Begley NEW YORK (Reuters) - If Dr Karl Deisseroth were an architect, he might be replacing stone or brick walls with floor-to-ceiling glass to build transparent houses. But since he is a neuroscientist at Stanford University, he has done the biological equivalent: invented a technique to make brains transparent, a breakthrough that should give researchers a truer picture of the pathways underlying both normal mental function and neurological illnesses from autism to Alzheimer's. In fact, the first human brain the scientists clarified came from someone with autism. ...