North High students are graduating at a higher rate thanks to credit recovery, but at what cost?

North High School has long suffered from abysmal graduation rates -- so, in 2008, Denver Public Schools added credit recovery, which allows students to retake courses online. Since then, grad rates have skyrocketed. But some North teachers wonder whether the gains are legit, and whether credit recovery is doing more harm than good. Read more in the cover story "Passing on Education."