The first point I would like to make is that people at an upper level than us, specially proffesors, have more knowledge than population at the same academic level like our classmates. So, the information teachers share to their students is more accurate and is delivered in the most didactic way. For instance, a professor need to have a degree from university in order to teach in an institution. Incomming teachers take courses of the subject they are going to lecture. Also, they attend to classes about who to teach and deliver the message in the best way. So, teachers are the most prepared to share knowledge.