Does violence on a movie, TV, or computer screen or in a song lyric beget violence in the streets? What about aggression and violence in televised sporting events? What are the known effects of violence in the media on the developing mind of a young child? Do rating systems and warning labels help in the effort to keep overtly violent materials out of the hands of children-or do they act as magnets? Where does violence in the media cross a line from legitimate entertainment and plot development to gratuitousness and even pornography? How do we define media violence, and just how much is...