Here we delve on history; on the more ancient first, recalling briefly across the centuries the discoveries of physics which, starting in the 1600s, paved the way for the experiment here described, then coming closer to the 1976 accomplishment of it, and to the filming of the movie “Interference of electrons” telling how that happened. In this case events, considerations, and motivations are presented by video inserts by the voice of the very protagonists.