Four studies comparedmemoryfor material that varied in humor, aggressive sexuality (tendency), and style. The findings were that humor improved memoryfor the material but arousing material increased recall further and interacted additively with humor. Humor seemed to have an effect on attention and selection of material while tendency influenced motivation and strength of recall Humor's role in education is assured. No matter how uncertain the effect of humor on appropriate attention and relevant memory, it is irresistible in the classroom. Indeed, when amusement is relevant to the task, äs in the memory for jokes to be transmitted in a social setting, there is a positive, if slight, effect on recall.In the earliest published study, Heim (1936) found that after a delay of between two and twenty-four weeks, 62 percent of the material initially laughed at was remembered, while only 8 percent of the material that did not elicit laughter was recalled. This figure was inflated slightly by the inclusion of three not-funny Stimuli that were remembered better than "slightly funny" Stimuli. In fact, with some computational gymnastics, it can be ascertained that on a 5 point scale (assuming "very funny" = 4 to "not funny" = 0) the remembered items were rated an average of 2.1 (just more than "funny") while the not remembered items averaged 1.3 (somewhat more than "slightly funny"). In spite of these reasonably clear results, Heim concludes that, "The main result of this experiment is to make one exceedingly chary of setting up any rules on the subject of humor" (p. 161).