The two storylines which can be categorized as science fiction are <em>A narrator recounts the day his hometown suffered an alien invasion, and A teacher takes her class to the past in a time machine to investigate their roots</em>. Science fiction storylines are varied. Among the most common storylines of them are alien invasions like in the H.G. Wells "War of the Worlds", and time travel with a machine or other vehicle that can travel through time like in "The Time Machine" by H.G. Wells.
