in 1893, joseph jastrow and hugo münsterberg led a public exhibit on psychology in the world's columbian exposition in chicago as an effort to celebrate psychology, offer information to the public, and correct popular misconceptions. the exhibit provided catalogs of information on equipment, research topics, and purposes of psychology. in a similar attempt to inform the public, the 1904 louisiana purchase exposition in st. louis included (among others) presentations from g. stanley hall, edward b. titchener, mary whiton calkins, john b. watson, and adolph meyer. the exhibits also included public testing and experimentation.