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The three types of stupidity

Stupid actions fall into three categories according to Balazs Aczel of the Institute of Psychology at Eotvos University in Budapest. His research suggests that foolish behaviour results from either "confident ignorance", lack of control or absentmindedness - explaining why clever people sometimes do stupid things.

(Picture: Person with paper bag over their head
Credit: lofilolo/Thinkstock)

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4 minutes