What is the fine-grained topic of the following text: Messages about the show: "Revenge of the Particle - January 17, 2009"
The End-of-2009 list is out, and the only change in the chart is that "Viagra in the Waters" is now #17 while the old 17 and 18 got pushed to 18 and 19. Only return the topic.
Ranking changes in an end-of-year list for a show.