Cool model, one of these days I might venture into the Vertex modeler again. The Wizard was a practical scientist who proved scientific theories with real-world experiments that any kid could understand. Kind of what scientists are supposed to do (posit a theory & prove it). Sagan used slick multimedia to try & persuade people to agree with him, not necessarily with the facts. I've often thought that many of his shows should begin with a footnote, "based on theory & conjecture". None the less, Sagan was very influential with the public at large.