David Aaronovitch became intrigued about why otherwise pragmatic people will buy into a conspiracy theory, preferring complex and unsubstantiated explanations to the simpler and usually well substantiated facts. 

His book Voodoo Histories is not just a critique of familiar and less familiar conspiracy theories, it also looks at why so many people find them so compelling. 

This talk promises to provide some thought-provoking and entertaining insights into what is meant by having "an open mind".