Many believe that Shakespeare had help writing at least some of his plays, but to what extent? AI might have an answer. Czech researcher Petr Plecháč has developed a machine learning system that determined which portions of Henry VIII were likely written by Shakespeare's contemporary (and long-suspected collaborator) John Fletcher. The approach trained an algorithm to recognize the word choices and rhythms of both Shakespeare and Fletcher plays from the time (such as The Tempest and Valentinian), and used a "rolling window" technique to study those styles without worrying about the starts or ends of scenes. The results were at once expected and surprising.