Interesting how many (mostly Slavic) countries adopted the Roman calendar but decided to use their own names. I would assume that in the earlier Slavic calendars the months wouldn’t begin on the same days, even if they had months as such.

I strongly suspect the modern “spectrum” is just grouping and labeling certain personality profiles that have always existed in roughly similar proportions. Meaning that it’s not the proportion that is increasing, it’s that we chose to define certain combinations of human traits as ASD.

On the whole this labeling is probably useful since more people will get the support they need. But the point of delineation is mostly arbitrary.

Still, big cities seem to have a lower rate so I wonder if there’s something about the methodology that depends on population density