This photo was taken on Nov. 16, 1968, when Robert A. Ferguson, author of “Psychic Telemetry: New Key to Health, Wealth, and Perfect Living,” was giving a speech at a Spiritualist convention in Los Angeles, California. Faintly appearing next to Ferguson is a figure that he later identified as his brother, Walter, who died in 1944 during World WarII. First glance, this might seem to be a double exposure or some kind of darkroom trickery, but this photo is a Polaroid (one of several taken of Ferguson at the time), making any kind of hoaxing quite unlikely at the time and very complicated. What do you think?