What is behind Outlander fever--the hit television drama's popularity? Is it author Diana Gabaldon's teasing posts on social media? Is it the real history reimagined? The highly emotional melodrama? Or is it the take-charge heroine and the sweet hero in a kilt? One of the show's biggest draws is its multigenre appeal. Gabaldon--whose Outlander novels form the basis of the series--has called it science fiction, fantasy, romance, historical...