Ostrov, Gentile, and Crick (2006) write that "our viewing of many educational programs such as "Arthur". suggests that relational aggression is modeled at a fairly high rate. For example, children may be shown excluding and ostracizing friends or peers on the playground as part of the TV show." (p. 622). They go on to theorize that preschoolers, due to their developmental stage, may have a hard time fully understanding conflict resolution, which typically occurs at the very end of a show. Shows like "Arthur" typically spend most of their time building up conflicts and this may impact the type of learning that is occurring while watching shows. Moreover, they cite research suggesting that the impacts of modeling relational aggression may be especially strong for girls. This research was elaborated on in the New York Times best-selling book on parenting "NurtureShock: New Thinking About Children" by Bronson and Merryman (2009). Their punch line is: "Essentially, Ostrov had just found that "Arthur" is more dangerous for children than "Power Rangers"" (p. 181).