Read the most advanced science of autism causes here. Bypass the commenterati and go direct to the science. Don't waste your time at the sites which pretend "no-one" knows what causes (or what sometimes cures) autism.
This is a website relating to the unchallenged theory of autism, IQ and genius, Personality and Individual Differences 14:459-482 (1993) by Robin P Clarke (the antiinnatia theory). An update review paper is being prepared for publication. Meanwhile you can download the original 1993 publication (my reprint) here . (the journal site version is here: http://dx.doi.org/10.1016/0191-8869(93)90316-U, but without added charts of social class and you may have to pay Elsevier $31.)
I cannot put the update paper on a website in advance of it being accepted by a journal. But in the interim I can send you a draft copy by email if you email a request for it to rpclarke{att]autismcauses{dott]info .
Comments here are not pre-moderated or re-editable so please choose your words with care.
You can see some of the information being hidden from you by organisations such as the UK "National Autistic Society", "Research Autism", and Cambridge's "Autism Research Centre" at this link and this one.
See this video of Polly Tommey explaining about the autism catastrophe (I don't share her ideas re mmr).

Causes of autism - update of unchallenged theory

This is a website relating to the unchallenged theory of autism, IQ and genius (the antiinnatia theory). An update review paper is being prepared for publication. Meanwhile you can download the original 1993 publication here . Be sure to print it out rather than trying to read on screen.

I cannot put the update paper on a website before it has been accepted by a journal. But in the interim I can send you a copy by email if you email a request for it to rpclarke [at] autismcauses[dot]info .