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Mentally retarded is defined as an IQ score below 70, I think. (trying to remember my psych/special ed classes) The actual term is "retarded" but the PC version is "mentally challenged". There are a lot of grey areas to consider, which is why they reversed themselves, I think. ITs a topic that will be and has been debated for a long time, b/c IQ can be subjective, and then there are racial implications, etc.
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