Aristotle thought that laughter is what separates us from the beasts, and that a baby does not have a SOUL, until the moment it laughs for the first time. Historian Barry Sanders, author of Sudden Glory, says that according to Aristotle, this moment of "human ensouling" is supposed to ...

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, ...