For most of the 20th century, the Sunday funnies were a family tradition, enjoyed each weekend by adults and kids alike. They were read by millions and produced famous fictional characters in such strips as "Flash Gordon", "Little Orphan Annie", "Prince Valiant", "Dick Tracy" and "Terry and the Pirates". Leading the lists of classic humor strips are "Bringing Up Father", "Gasoline Alley", "Li'l Abner", "Pogo", "Peanuts" and "Smokey Stover". Some newspapers added their own local features, such as "Our Own Oddities" in the "St. Louis Post-Dispatch". There were educational strips, such as King Features' "Heroes of American History". In addition to the comic strips, Sunday comics sections also carried advertisements in a comics format, single-panel features, puzzles, paper dolls and cut-and-paste activities. "The World Museum" gave readers instructions for cutting pictures apart and assembling them into a diorama, often with a subject from nature, such as "The Grand Canyon" or "Buffalo Hunt". A page on covered wagons carried the headline, "Covered wagons shown in an easy-to-build model: Scissors, paste and wrapping paper are all you need to make this Western set."