Just one slight problem:
Tylenol was introduced in 1955. Autism was first scientifically documented in 1926. If Tylenol causes autism, how did those parents in the 1920s get their hands on it?
Also, wouldn't there been a clear link between Tylenol sales and the occurrence of autism? Where is the data showing that the adoption of Tylenol in the 1960s resulted in a rise in autism, and that the "rise" of autism in the 1990s is linked to an increase in Tylenol use?
> If Tylenol causes autism, how did those parents in the 1920s get their hands on it?
The claim is that Tylenol is a factor that increases the risk of autism. It is not the cause of 100% of all cases.
That said, the first synthesis of Paracetamol in the USA was Johns Hopkins in 1877, so maybe the answer is they went to Baltimore.
Now do Tylenol sales kicking up in the 60s.