[mateo1]

Doing a meta-analysis on something easily quantifiable is sketchy enough, doing a meta-analysis on something as vague and hard to measure as "cognitive intelligence" is.. well, it's sociology's territory. Not to say it isn't of value, many discoveries were made on a lot less methodologically strict grounds and this kind of "conversation" does create the stimulus for further, more specific research, but you ought to read this more like a an investigative journalistic piece with a lot of opinion rather than hard science.