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I just don't believe that based purely on my personal experience. I've been around many many people and in the last 15-20 years the amount of people with autism has exploded. It was very rare 30 years ago in my area, the occasional led exposure here, farm chemicals there... But now it's seemingly every 10th house that has someone that is nonverbal.

I'm all for papers and science but only if it matches the real world.