In this chapter, the hosts explore the qualities that set good science fiction apart from fantasy. They highlight the works of Greg Egan and Neal Stephenson as prime examples of imaginative science and discuss Egan's genius in avoiding paradoxes in his time travel-themed book. The importance of creating a coherent and plausible fictional world with consistent laws of physics and society is also emphasized, along with brief mentions of Ted Chiang and Borges' manipulation of time and reality.