Grant Wood's 'American Gothic' [12min @18:00]

Two people, a house, a pitchfork, and a barn. It's hard to find a better-known American painting than Grant Wood's masterpiece American Gothic. But just who are those grim people, and why do they have such a hold on the American psyche? In this hour of"To the Best of Our Knowledge," the history of an American classic. Steven Biel is the Director of the History and Literature Program at Harvard University, and the author of American Gothic. He talks with Jim Fleming about Grant Wood's iconic American painting: who the models were; how the painting's been received and why it's so often parodied.