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Fresh Air Weekend: Fermenting, Joan Rivers

47:54
    Yogurt is produced by the bacterial fermentation of milk. "Bacteria in our gut enable us to live," says author Sandor Katz. "We could not survive without bacteria." (iStockphoto.com)
    Yogurt is produced by the bacterial fermentation of milk. "Bacteria in our gut enable us to live," says author Sandor Katz. "We could not survive without bacteria." (iStockphoto.com)

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