Isn't it funny how in high school (mine was public), which is free, we usually have teachers that are fully qualified to teach us the topics they are teaching. They are required to have teaching certifications, and are likely to have degrees in the class they teach. At a college or university, which is not free, we usually are taught most of the things we learn from Graduate Student Instructors, which essentially consists of readers of this forum. We are not qualified to teach, we have no teaching certifications, and sometimes we've never taken the classes we are teaching!