Full episode 506: Secret Identity Prologue Share a clip ByIra Glass Ira attempts to solve perhaps the most unsolvable mystery at the Trees of Mystery, in California: Exactly who is the voice of Paul Bunyan? (7 minutes) More by Ira GlassView all 700: Embiggening Apr. 10, 2020 Act Three: Tunnel Vision A mysterious tunnel in Toronto leads to wild public speculation. 699: Fiasco! Apr. 3, 2020 Act Two: Squirrel Cop The first day on the job inevitably means mistakes, mishaps, and sometimes, fiascos. 697: Alone Together Mar. 20, 2020 Act Five: Let’s Talk Radio Ira talks to his dad about a job he had before Ira was born.