Knee replacements might make it onscreen

I wish the subject of this week's column existed before I underwent a root canal a decade ago. The dentist attacked the wrong tooth. He found the correct one a few days later, after I returned feeling like Mike Tyson had KO'd me. Medical mistakes: B-Line Medical is about catching them before they happen. The company, nestled in a corner building a block off Dupont Circle, sells kits to medical and nursing schools so educators can film future doctors and nurses practicing on people or on wired-up dummies. Educators use the recordings, from B-Line's "SimCapture" platform, as a teaching aid.