Fact: the actor Daniel Radcliffe is currently starring in the Broadway show “The Lifespan of a Fact,” as a magazine fact checker with an aviation inspector’s zeal for accuracy. The play is drawn from a real-life skirmish: in 2005, Jim Fingal, an intern at The Believer, was tasked with fact-checking an essay by John D’Agata (played by Bobby Cannavale), about a teen suicide in Las Vegas. D’Agata had more of a watercolorist’s approach to the truth. When Fingal tried to correct his claim that Las Vegas had thirty-four licensed strip clubs—a source indicated that it was thirty-one—D’Agata said that he liked the “rhythm” of thirty-four. Their epistolary tussle was expanded into a book in 2012.