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 Dine-In Theater Restaurant would bring the Sci-Fi Dine-In the level of success that had been garnered by the 50's Prime Time Café. Within five weeks of opening, it was serving between 1,500 and 2,000 meals on a daily basis, just as the 50's Prime Time Café was doing. A year after opening, the Sci-Fi Dine-In had become the most popular restaurant in the park, serving more than 2,200 people per day at peak periods. Starting from its earliest days, the restaurant equipped its servers with point of sale mobile devices that relayed orders to a printer in the kitchen, which was considered at