Three Laws of Robotics card-readers in "The Caves of Steel" have a capacity of only a few kilobytes per square centimeter of storage medium. "Aurora", in particular, presents a sequence of historical developments which explains the lack of nanotechnology — a partial retcon, in a sense, of Asimov's timeline. There are three Fourth Laws written by authors other than Asimov. The 1974 Lyuben Dilov novel, "Icarus's Way" (a.k.a., "The Trip of Icarus") introduced a Fourth Law of robotics: Dilov gives reasons for the fourth safeguard in this way: "The last Law has put an end to the expensive aberrations of designers to give psychorobots
Sci-Fi (G.I. Joe) Sci-Fi, he is seen watching "The Transformers". Sci-Fi appeared in DiC's "" cartoon. Jerry Houser reprises his role as Sci-Fi in this cartoon. Sci-Fi is a supporting character in the Joe novel 'Fool's Gold'. His simulation training pays off as he pilots the space shuttle, the USS Defiant, through several maneuvers that end up saving the Earth from a doomsday weapon. He is also a supporting character in 'Serpentor and the Mummy Warrior'. Sci-Fi's figure is briefly featured in the fiction novel "6 Sick Hipsters". In the story, the character Paul Achting spent four years collecting G.I. Joe figures to