[kansando]

Autism is more complex than that. See for example http://www.scientificamerican.com/article.cfm?id=vitamin-d-a.... One of the big mysteries is that Somali immigrants to the US and Sweden have a much higher rate of autism than their native counterparts. Other factors implicated include increasing parents age at time of birth(mother's and father's), more frequent ultrasounds, more chemical environment, etc. Once you start to think through each factor, the N^2 effect of geeks marrying other geeks is unlikely to explain the 5-10X increase in autism over the last 20 years.

[cabalamat]

> One of the big mysteries is that Somali immigrants to the US and Sweden have a much higher rate of autism than their native counterparts.

Given that Somalia lacks a government, I would imagine health care there is rudimentary, and it's likely that autism (and other conditions) is under-diagnosed.