A few years ago, I stumbled on a very colorful article from New York magazine about 9/11 conspiracy theories, "The Ground Zero Grassy Knoll." It included the work of one of the theorists, Nick Levis, who categorized our beliefs about why the attacks happened using what he called "HOP" levels. As Mark Jacobson explained it in New York, Levis promoted the idea that what people believed could be broken down into four theories:
"(A) The Official Story (a.k.a. "The...
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