I see Collection Station has become very active in the Book Category and that's a good thing.  Still, I'm somewhat confused as to the design of the categories.  For a long time they were static and pretty much matched the categories on Amazon.  Fantasy was separate from Science Fiction.  Now I see "Science Fiction and Fantasy" as a category and Fantasy as a subset category.   What therefore are we doing with just Fantasy?

Does anyone know the definition of these categories?  Is Teen for all Teen ficition accept Teen SF or Fantasy?