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 on the Rock bi-weekly" basis. Season One of "Sci-Fi on the Rock TV" was hosted by Steve Lake and Ellen Curtis, and ran from September 11, 2009 to May 2010. Season Two began in September 2010, with both hosts returning, until Ellen Curtis was replaced by Melanie Collins. Sci-Fi on the Rock held its fifth festival on April 15, 16 and 17, 2011, making this year the first time the organization launched a festival that spanned three days. It was held again at the St. John's Holiday Inn, and was kicked off with a book launch from festival co-founder Darren Hann, followed by