Three girls are using prior knowledge, texts and images to rank five Civil War heroes in order of heroism. Then they’ll write essays justifying their choices. Two classmates are analyzing the Lincoln-Douglas debates. “Explain what Lincoln meant when he said, ‘A house divided against itself cannot stand,’” Madison reads. “So, that means, if everyone’s arguing, the country will break apart.” Knowledge matters in Chris Hayes’ second-grade class at Westergard Elementary School in