Chapter 15 mainly discusses the topic of psychological disorders and also the types. I found out that two subjects were interesting, one is anxiety disorders and the other is mood disorder and suicide. As a matter of fact, these two problems have already become more and more serious in today's society. As a student, sometimes we feel anxious and worried about school work. But when the problem becomes really serious, it may cause diseases a mentioned in chapter 15. Also, mood disorders kind of result in suicide and other bad effects to our body. We need to be aware of those effects of the illnesses and try to be away from them. As I briefly read through the chapter, maybe the part of childhood disorder is a little bit stuck to me and I have confusions about it. Before reading the textbook, I don't even know about that bad experience in childhood can cause problems in future development.