Karel Čapek himself did not coin the word. He wrote a short letter in reference to an etymology in the "Oxford English Dictionary" in which he named his brother, the painter and writer Josef Čapek, as its actual originator. In an article in the Czech journal "Lidové noviny" in 1933, he explained that he had originally wanted to call the creatures "laboři" ("workers", from Latin "labor"). However, he did not like the word, and sought advice from his brother Josef, who suggested "roboti". The word "robota" means literally "corvée", "serf labor", and figuratively "drudgery" or "hard work" in Czech and also (more general) "work", "labor" in many Slavic languages (e.g.: Bulgarian, Russian, Serbian, Slovak, Polish, Macedonian, Ukrainian, archaic Czech, as well as "robot" in Hungarian). Traditionally the "robota" (Hungarian "robot") was the work period a serf (corvée) had to give for his lord, typically 6 months of the year. The origin of the word is the Old Church Slavonic (Old Bulgarian) "rabota" "servitude" ("work" in contemporary Bulgarian and Russian), which in turn comes from the Proto-Indo-European root "*orbh-". "Robot" is cognate with the German root "Arbeit" (work). The word robotics, used to describe this field of study, was coined by the science fiction writer Isaac Asimov. Asimov created the ""Three Laws of Robotics"" which are a recurring theme in his books. These have since been used by many others to define laws used in fiction. (The three laws are pure fiction, and no technology yet created has the ability to understand or follow them, and in fact most robots serve military purposes, which run quite contrary to the first law and often the third law. "People think about Asimov's laws, but they were set up to point out how a simple ethical system doesn't work. If you read the short stories, every single one is about a failure, and they are totally impractical," said Dr. Joanna Bryson of the University of Bath.) Mobile robots have the capability to move around in their environment and are not fixed to one physical location. An example of a mobile robot that is in common use today is the "automated guided vehicle" or "automatic guided vehicle" (AGV).