In 1968, David Lewis decides that one truth can unify every theory he's had about the nature of the universe. It is that every possible world is equally real. He devises a distinctive way of arguing for the view, leading to a method of doing philosophy that is as influential as anything Lewis advances. Meanwhile, a soon-to-be colleague and rival, Saul Kripke, reads Lewis' paper and fires off eight objections. On the other side of the world, an entire continent becomes enamored with the life and works of David Kellogg Lewis, an admiration that survives to this day. Guest voices include Frank Jackson, Alan Hajek, John Bigelow, Helen Beebe, Anthony Fischer, Peter Anstey, and David Lewis.

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