Yale researchers who have studied hundreds of kindergartners for nearly 40 years say one in five was dyslexic. But perhaps their most important finding: There is no link at all between dyslexia and intelligence. Susan Spencer reports on efforts to help those with dyslexia "crack the code," from students at a Louisiana school catering to dyslexic children, to a new law to help the high percentage of prison inmates who have dyslexia.