Presented videotaped "Sesame Street" segments to explore preschoolers' ideas about disabilities. Found that most were aware that the videotaped children had difficulty performing age-appropriate tasks, but had fewer ideas about why the child with Down syndrome had difficulty than about the child using a wheelchair. Significantly more thought the child with Down syndrome could do more "if he tried really hard" than thought so for the child with physical disability. (Author/KB)