Why do sensible people sometimes believe the most unlikely conspiracy theories?
The columnist Jonathan Kay, author of Among the Truthers: A Journey Through America's Growing Conspiracist Underground, has been investigating the phenomena for two and a half years.
In all that time, he told Evan Davis, "I can confess that I did not win a single argument with a conspiracy theorist".
The quality that binds conspiracy theorists together, he explained, was distrust - of government, media and organised religion.
"There is an impulse to align ideology with facts. They want to make the world as they imagine it appear as the world as it is."
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