For the 50th episode of Reading the Art World, host Megan Fox Kelly speaks with Wanda Corn, Professor Emerita at Stanford University, about her latest book, “The Couple with the Pitchfork: American Gothic from Easel to Icon,” published by Princeton University Press. Grant Wood’s “American Gothic” is one of the most recognizable paintings in the world. Yet its two famously stern figures have been interpreted in remarkably different ways since the painting first appeared in 1930. Was Wood celeb...