There is no such thing as a genetic epidemic. Yet U.S. autism rates have gone from about 1-in-5000 in the 1980s to 1-in-166 today. But if autism is purely genetic (without an environmental "trigger") and has always been prevalent at the same constant rate, then where are the 1-in-166 autistic 25-year-olds (those born in 1980)? Where are the 1-in-166 autistic 55-year-olds? Why can't we find them?
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