As a result of years of activism by Action for Children's Television and others against shows they believed blurred the line between entertainment and advertising, the Children's Television Act was passed in 1990. It began to be strictly enforced in 1996. The Federal Communications Commission began requiring three hours a week of educational and informational program intended explicitly for children, at times when children were awake. Since this required three hours to be "off-limits" to programs aimed at the general public, the networks naturally chose to air them on Saturday morning, when children were already watching. As a result, almost every Saturday-morning network show is required to contain some educational content. Fox and The WB worked around this problem by airing short one-hour weekday children's blocks instead of morning news shows, but those weekday blocks no longer exist (with the notable exception of PBS, which continues to have large weekday children's programming blocks as of 2010). Nonetheless, there were still a few toy-based children's programs in the 1990s, particularly "Power Rangers" and "Pokémon".