Reviews four books that contextually examine definitions of childhood and adolescence: "Peer Power: Preadolescent Culture and Identity" (Patricia A. Adler and Peter Adler); "Angels' Town: Chero Ways, Gang Life, and Rhetorics of the Everyday" (Ralph Cintron); "Everyday Courage: The Lives and Stories of Urban Teenagers" (Niobe Way); and "At Home in the Street: Street Children of Northeast Brazil" (Tobias Hecht). (SM)