The document discusses teaching and learning innovations through different generations. It provides examples of educational innovations from the 9th century to the present. Some key innovations mentioned include the establishment of the first universities in the 9th century, the growth of correspondence colleges in the 18th century enabled by the postal service, the introduction of visual aids like stereographs in 1910, and the use of radio and television for educational broadcasts and courses in the 1920s-1960s. The document also discusses the rise of technologies like whiteboards, calculators, computers and the internet which have enabled online and digital learning tools from the 1970s to present day.