Two years after Katrina, BILL MOYERS JOURNAL examines the lessons of the disaster and what they say about American culture and values.

As the second anniversary of Hurricane Katrina approaches, Bill Moyers gets two views on what the disaster and its aftermath says about American culture and values with Princeton's Melissa Harris-Lacewell and author and environmental journalist Mike Tidwell. Also on the program, one of the country's leading historians, Martin E. Marty, who has spent a lifetime unraveling the mysteries of the world's religions, discusses his latest book on the mystery of childhood and what adults can learn from it. And, Bill Moyers bids farewell to Karl Rove.