Under stress we imagine patterns that do not exist. A striking real-life example of this phenomenon is reported by Paul Fussell in his astonishing book The Great War and Modern Memory. Troops living in the trenches during the First World War, under the most unimaginable conditions of fear and uncertainty, were deprived of reliable information about the war because the official army newspaper contained little but inaccurate propaganda. In the absence of reliable information, and in desperate need of it, troops fell prey to rumor in a manner not seen since the Middle Ages—rumors of wraithlike
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