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An expert on folk legends, Jan Brunvand, says that legends “acquire a good deal of their credibility and effect from their localized details.”

A person’s knowledge of details is often a good proxy for her expertise. Think of how a history buff can quickly establish her credibility by telling an interesting Civil War anecdote. But concrete details don’t just lend credibility to the authorities who provide them; they lend credibility to the idea itself. The Civil War anecdote, with lots of interesting details, is credible in anyone’s telling. By making a claim tangible and concrete, details make it seem more real, more believable.