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) the designated pilot for the G.I. Joe "Starfighter". Sci-Fi was first released as an action figure in 1986. A new version of Sci-Fi was released in 1991. A new version of Sci-Fi was released in 1994 as part of the Star Brigade line. As part of the 30th Anniversary toy line, a new version of Sci Fi has been released in 2011 In the Marvel Comics "" series, he first appeared in issue #64 in a small cameo and appeared fully in #65. He is a supporting character in the storyline running through issues #145 - 149. He is part