The first of a two part series on special relativity, I provide a brief overview of the historical development of relativity theory, including a discussion of the role of the Michelson-Morley experiment, and considerations from classical electromagnetism. I then outline Einstein's two postulates, discuss their meaning, and provide some explanation for how to interpret a constant speed of light. I also provide an introduction to Lorentz transformations and the notion of spacetime. Recommended pre-listening is Episode 13: Newtonian Mechanics.

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