In the 1920s, advertisements in Popular Mechanics offered a $5,000 prize for anyone able to prove the Earth is round. The only catch: the challenge was rigged. No proof, however scientifically rigorous, could convince the advertiser, Wilbur Glenn Voliva, General Overseer of the Christian Catholic Apostolic Church, headquartered in Zion, Illinois. Convinced that the Earth is flat based on reading various Biblical passages literally, Voliva vigorously promoted flat-Eartherism, through his control of the church, ownership of a radio station, and through his control of Zion’s government and schools. John Hamer of Toronto Centre Place, will present the history of Voliva, and the rise and fall of his church.