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<p>Extraordinary Popular Delusions and the Madness of Crowds is a study of crowd psychology by Scottish journalist Charles Mackay. The subjects of Mackay's debunking include witchcraft, alchemy, crusades, duels, economic bubbles, fortune-telling, haunted houses, the Drummer of Tedworth, the influence of politics and religion on the shapes of beards and hair, magnetizers (influence of imagination in curing disease), murder through poisoning, proph...Seguir leyendo