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Dr Ippy writes:

But it doesn't hold true for women. As the abstract of this PLOS ONE paper (open publication) says, "The ability to accurately assess the intelligence of other persons finds its place in everyday social interaction and should have important evolutionary consequences."

So the authors did an experiment to find out whether people could accurately judge intelligence from photos of other people (university students, natch), whose IQ had been measured conventionally. And they could! At least, they could judge men's intelligence well from photos, but not women's. However, "Our study revealed no relation between intelligence and either attractiveness or face shape."

The full report [PDF] can also be downloaded.