After "Watch Mr. Wizard" was cancelled in 1965, Herbert produced eight films in a series titled "Experiment: The Story of a Scientific Search"; these aired on public television in 1966. In the same year, Herbert produced the "Science 20" series, which were 20-minute films of experiments that were designed for classroom use; a student would record and analyze data based on the film. In 1977, he began producing a series of "How About" episodes about scientific topics. These were 90-second films that could be used in news programs; by 1986, he produced 536 films.