During a field trip in Detroit on a summer day in 1989, a group of African American fifth-, sixth-, and seventh-graders talked, laughed, and ate snacks as they walked. Later, in the teacher\u2019s lounge, Jeanetta, an African American teacher chided the teachers, black and white, for not correcting poor black students for \u201ceating on the street, \u201d something she saw as stereotypical behavior that stigmatized students. These thirty children...