I always think of "village idiot" as referring to a village's most notoriously witless person (or hyperbolically comparing someone to one.) Out of a village of 10,000 or so, statistically you'd expect the dumbest person to have an IQ around the mid forties.
10,000 is a very large number for a village. In order for this sort of analogy to make sense, one should be in the stereotypical village with about one of everything, and probably not many more people than Dunbar's number. So maybe 200-500 people.
Today's post, My Childhood Role Model was originally published on 23 May 2008. A summary (taken from the LW wiki):
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