One of the great things about science fiction is how it allows an author to explore the human condition in contexts that ordinary fiction cannot. For example, it can explore the idea of immortality. Is boredom a problem? If you are immortal, but others aren’t, what is it like to see everyone you know age and die? Is it as desirable as it seems?
Some themes occur repeatedly in science fiction. Immortality is just one. A very common one is the idea of alien races — or even intelligent machines. Such stories view humanity through new eyes.
Another common one is time travel, and that is the subject of today’s Sci-Fi Saturday!