In this segment, we explore the rise and fall of a group of professional laughers hired to laugh for money on Fran Drescher's show "The Nanny." Then JoAnne Bachorowski, a psychologist at Vanderbilt University, says that giggling girls have more power than you think. She studies the sound of laughter, and explains how we use laughter to manipulate other people, or, says Barry Sanders, to make ourselves feel safe.
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