In the modern world, people can reach to increasing number of data and knowledge sources. School children are not exceptions. For example, they can obtain what they want to know just by logging to the internet. As a result, some people came to believe that there are no more needs for physical teachers in classrooms. However, I cannot agree with this idea due to mainly two reasons, namely controlling school children's behaviours and motivating them to continue their studies. As such, this essay is to discuss these two major merits of teachers to justify my position to disagree with the statement.