A.J. Jacobs - "There is no useless knowledge"

Author of "The Year of Living Biblically," "The Know-It-All" and "The Guinea Pigs Diary," as well as among many other books that explore his life-as-experiment, A.J. Jacobs, who appeared at the 2009 IdeaFestival, responds to the question: "Is there useless knowledge?"

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