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What do you think is the cause of autism? [Poll]

It seems like every week there is a new study out that suggests the cause of autism. If you do a Google search for the cause of autism you will find news story after news story announcing the latest study or finding. Researchers and scientists are working hard to find the cause (and then hopefully the cure) of autism.  Do you have a hunch as to what causes autism? Let us know below (you can select up to 3 answers).