The original Feynman Lectures Website was feynmanlectures.info, which went online in 2006. The online edition of The Feynman Lectures on Physics was published there in 2013, and also mirrored at a new Caltech website, feynmanlectures.caltech.edu. Some years later (I forget exactly when) feynmanlectures.info was shut down and its contents was moved to feynmanlectures.caltech.edu/info.
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