What can Ernest Hemingway teach us today about the morality of war, the eternal and transient nature of love, and how to write a masterpiece? Listen as author and teacher David Wyatt talks with EconTalk's Russ Roberts about Hemingway's epic For Whom the Bell Tolls. Topics include Hemingway's role in the wars of the 20th century, the book's context and themes, and its lasting influence on…