One example is a famous experiment that Nalini Ambady and Robert Rosenthal of Harvard did in 1992, with videotapes of traditional interviews.

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"The thing that I loved about 'Feud, ' we froze a moment in time for these families that had never occurred before, " he said, adding the show would furnish families with videotapes of the show.

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Confronted with wiretaps, videotapes and the evidence of former cronies, the trial jurors were not impressed with Mr Edwards's contention that the riverboat companies had paid him for his legal and lobbying services.

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As a result, few will opt to replace their entire DVD libraries, as many did with the earlier generation of videotapes.

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During a conference call with reporters, the center said lawyers involved with the case had seen some videotapes of al-Qahtani as the result of a 2009 federal court ruling, but they were not allowed to discuss them publicly.

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