Surgeon and New Yorker writer Atul Gawande talks about how medicine can not only improve life but also improve the process of dying. Playwright Simon Stephens describes adapting Mark Hadden’s novel “The Curious Incident of the Dog in the Night-Time,” for the stage. And he’s joined by Alexander Sharp, who stars in it. James McPherson on Jefferson Davis as a Civil War military leader and as the president of the Confederacy. Guitarist Joe Perry talks about his life in and out of Aerosmith.