Rosa Parks, an African American seamstress in 1955 Alabama, had no idea she was changing history when, work weary, she refused to surrender her seat to a white passenger on a segregated bus. Now she is immortalized for the defiance that sent her to jail and triggered a bus boycott that ctapulted Martin Luther King jr. into the national spotlight. Who was she, before and after her historic act, and how did it sound the death knell for Jim Crow?