"The Pope" was a revered Dutch art expert - and yet he fell for a not very convincing forgery of a "lost" Vermeer masterpiece. The forger had duped other art connoisseurs too - including the high ranking Nazi Hermann Göring. But perhaps Han van Meegeren's biggest con was to convince the Dutch public that he was a cheeky resistance hero.

We assume knowledge and intelligence can protect us from being duped - but often they are not enough to save us from the fraudster's greatest ally - our own wishful thinking.

Read more about Tim's work at http://timharford.com/

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