Here are some good links if you want to learn more, courtesy of the Special Olympics:
IntellectualDisabilities Fact Sheet - A one-page reference about intellectual disabilities.
Language andTerminology - A one-page fact sheet on the language to use when talking about people with intellectual disabilities.
Youth OpinionResearch on the R-word - Recent research overview of the usage of the word “retard” among young people.
Media Portrayal ofPeople with Intellectual Disabilities Research - Research report conducted in 2005 about the portrayal of people with intellectual disabilities in film and in the media.