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This is a video lecture in a course on the philosophy of language. It explains possible worlds, rigid designators, and non-rigid designators using some basketball examples involving LeBron James and Mt Everest and some other stuff. Even though the idea of possible worlds goes back to Gottfried Wilhelm Leibniz, this short video is specifically designed to provide the background necessary to understand Lecture 2 of Saul Kripke's famous work, Naming and Necessity.