 It appeared in the 1976 collection "The Bicentennial Man and Other Stories".Simeon Weill, a physicist, experiments with time travel and travels back to New York City in 1925, where he meets Hugo Gernsback, a science fiction author and Weill's hero.Although only given a few minutes sitting with Gernsback on a park bench, he manages to convey to the author some of the scientific developments to come in the next fifty years.