Relieved from the overloaded burden of homework in senior high school, many students go into college only to find that they have plunged into the sea of knowledge without anybody telling them where to swim. Some people are filled with misgivings about university students' free choices: how could they possibly tell, at such a young age, which subject is more useful than others and choose it as their focus of study in the next four years which are probably the most valuable time in their entire life? In my view, however, such considerations seem rather superfluous, for choosing a subject by students themselves is beneficial both to the students and the whole society as well.