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Seven years after Richard Feynman died, I visited Caltech for the first time. One reason for the visit was to give a talk about the transactional interpretation of quantum mechanics, which draws so strongly on Feynman’s own unusual ideas about the nature of electromagnetic radiation, now more than half a century old. It was, to say the least, an unusual feeling to be talking not just from the spot where Feynman himself used to lecture, but about his own work. And when, during the question period at the end of the talk, the discussion moved on to QED, the dream-like quality of the occasion intensified — an audience at Caltech, of all places, was asking me to explain QED to them!
But the main purpose of the visit was to fill in the background to the Feynman legend in preparation for writing a book, visiting the places where he used…

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