53 years ago TODAY, multiplication tables suddenly came with a groove when “Schoolhouse Rock!” premiered on ABC in 1973! Dropped between Saturday morning cartoons as three-minute jams, the series went on to teach a whole generation grammar, history, math, and civics through earworms like “Conjunction Junction” and “I’m Just a Bill.” Those little cartoons turned weekend cereal time into sing-along study hall and ended up living on way past the ABC run in classroom TVs and DVDs. #nostalgia #tvhist