About two decades ago, people hardly knew about a projector that facilitated students’ study. However, thanks to our advanced technology, more and more schools are equipped with projectors because of their benefits in education. Without this modern facility, students in the past could still study but in a more difficult way. Instead of presenting their ideas through a projector, students had to make a large poster including their opinions about a problem. Besides, there were no visual images and videos as learning sources in the classroom; therefore, teachers in the past also prepared lots of tasks that encouraged their students to perform livelily. Despite this lack, their learning results seemed quite good as there were still famous and successful students during that period of time.