I will digress from today's discussion.
Regarding knowledge, the major change that has occurred since 2012 has to do with the fact that many sources of information are available. Before, people did not have access to so many documents, films and presentations. We are currently witnessing a dramatic increase in access, for all programs. For teachers, that is very beneficial, as they are not presenting a single point of view from one book, but several points of view, so that students are exposed to various ways of thinking, which often come from a number of different cultures. That enriches education.