the media provided the public more accessible psychological information through the publication of countless books and popular magazines including "harpers", "forum", "atlantic monthly", and "colliers". after wwi, demand grew for a more frequent source of popular psychology and newspapers became a primary source of public information. in fact, newspaper columns were so well-received that professional psychologist jastrow had a column entitled "keeping mentally fit" that appeared in more than 150 newspapers in the 1920s.