The portrayal of homosexuality on television, from the less than flattering depiction of gays in the 1950s, through Billy Crystal's gay character on ""Soap"" to the present-day phenomenon of ""Queer Eye for the Straight Guy.""

The depiction of minorities on American TV, and how it changed with the development of the civil-rights movement, up to the present with ""The Bernie Mac Show."" And Julia was the first show that had a African American lead.

How violence has been depicted on TV over the years and how it may affect viewers, from the gritty crime dramas of the 50s like ""The Untouchables"" to the gritty crime dramas of today like ""The Sopranos"" and ""The Shield"", including the westerns of the 50s and news coverage of the Vietnam War.