Organized by Jane Pauley. In our cover history, Seth Doane informs about Pope Francis’s funeral and the pontiff’s legacy. In addition: David Martin remembers the events of the fall of Saigon, 50 years ago this week; Mo Rocca traces the life of singer and composer Bobby Darin, the theme of a Broadway musical; Lee Cowan observes the centenary of the publication of “The Great Gatsby” by F. Scott Fitzgerald, while David Pogue marks the twentieth anniversary of YouTube; And Tony Dokoupil sits with former New England Patriots coach Bill Belichick.