In a previous blog post, “Rediscovering Science Fiction,” I wrote about how and why I returned to reading science fiction. In this post I’ll talk about themes I’m discerning as I read. There are, I’m learning, more themes than one can fire a laser gun at. Rather than call them themes, however, I’m going to call them subgenres. A theme is what a work of literature is about: justice, revenge, power-seeking, etc. A subgenre is a smaller category within a larger one. Within the large category of Sci...