This sort of comment is so arrogant, I have to call foul.
Are you an educator? Then why haven't you done this yourself? Why isn't education revolutionized as we speak?
Are you actually ignorant about how to teach? Then maybe you should learn about it before proclaiming yourself an expert.
Teaching is fundamentally about one and only one interaction: a teaching talking with a student. Notice the word "with": although some teaching can happen with one-way transmission, it's not effective. Humans learn through iterative processes of getting challenged, making mistakes, getting feedback, changing, improving, perfecting. This happens at every stage, even in the course of a five minute lesson or lecture.
Even when I am teaching college students, in a lecture setting, there is a LOT of two-way communication. I can tell when they don't get things. I can ask them questions to see how fast they respond. I can see them nod or frown. I can see them stare at their laps, smiling (which means they are texting instead of thinking). I can walk between them and look over their shoulders. They can ask questions. They can see my enthusiasm. They can participate in groups or singly.
Teaching is about conversation. Although there are ways of having meaningful conversation with 2,5, 10, even 20 people, the effectiveness of that conversation drops as the group sizes get larger, until you are in the 200 person lecture hall and the conversation becomes almost unidirectional.