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The Hitchhiker's Guide to the Galaxy is a comic science fiction series created by Douglas Adams that has become popular among fans of the genre(s) and members of the scientific community. Phrases from it are widely recognised and often used in reference to, but outside the context of, the source material. Many writers on popular science, such as Fred Alan Wolf, Paul Davies and Michio Kaku, have used quotations in their books to illustrate facts about cosmology or philosophy.
In the first novel and radio series, a group of hyper-intelligent pan-dimensional beings demand to learn the Answer to the Ultimate Question of Life, The Universe, and Everything from the supercomputer, Deep Thought, specially built for this purpose. It takes Deep Thought 7½ million years to compute and check the answer, which turns out to be 42. Deep Thought points out that the answer seems meaningless because the beings who instructed it never actually knew what the Question was.
When asked to produce The Ultimate Question, Deep Thought says that it cannot; however, it can help to design an even more powerful computer that can. This new computer will incorporate living beings into the "computational matrix" and will run for ten million years. It is revealed as being the planet Earth, with its pan-dimensional creators assuming the form of mice to observe its running. The process is hindered after eight million years by the unexpected arrival on Earth of the Golgafrinchans and then is ruined completely, five minutes before completion, when the Earth is destroyed by the Vogons to make way for a new Hyperspace Bypass. In The Restaurant at the End of the Universe, this is revealed to have been a ruse: the Vogons had been hired to destroy the Earth by a consortium of psychiatrists, led by Gag Halfrunt, who feared for the loss of their careers when the meaning of life became known.
Lacking a real question, the mice decide not to go through the whole thing again and settle for the out-of-thin-air suggestion "How many roads must a man walk down?" from Bob Dylan's song "Blowin' in the Wind".
At the end of the radio series, the television series and the novel The Restaurant at the End of the Universe, Arthur Dent, having escaped the Earth's destruction, potentially has some of the computational matrix in his brain. He attempts to discover The Ultimate Question by extracting it from his brainwave patterns, as abusively suggested by Ford Prefect, when a Scrabble-playing caveman spells out forty two. Arthur pulls random letters from a bag, but only gets the sentence "What do you get if you multiply six by nine?"
"Six by nine. Forty two."
"That's it. That's all there is."
"I always thought something was fundamentally wrong with the universe"
Six times nine is actually fifty-four. The program on the "Earth computer" should have run correctly, but the unexpected arrival of the Golgafrinchans on prehistoric Earth caused input errors into the system—computing (because of the garbage in, garbage out rule) the wrong question—the question in Arthur's subconscious being invalid all along.
Quoting Fit the Seventh of the radio series, on Christmas Eve, 1978:
Narrator: There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.
There is another theory, which states that this has already happened.
In Life, the Universe and Everything, Prak, a man who knows all that is true, confirms that 42 is indeed The Answer, and confirms that it is impossible for both The Answer and The Question to be known in the same universe (compare the uncertainty principle) as they will cancel each other out and take the Universe with them to be replaced by something even more bizarre (as described in the first theory) and that it may have already happened (as described in the second). Though the question is never found, 42 is the table number at which Arthur and his friends sit when they arrive at Milliways at the end of the radio series. Likewise, Mostly Harmless ends when Arthur stops at a street address identified by his cry of, "There, number 42!" and enters the club Beta, owned by Stavro Mueller (Stavromula Beta). Shortly after, the earth is destroyed in all existing incarnations.
Douglas Adams was asked many times why he chose the number 42. Many theories were proposed, including that 42 is 101010 in binary code, that light refracts off water by 42 degrees to create a rainbow, that light requires 10−42 seconds to cross the diameter of a proton. Adams rejected them all. On 3 November 1993, he gave an answer on alt.fan.douglas-adams:
The answer to this is very simple. It was a joke. It had to be a number, an ordinary, smallish number, and I chose that one. Binary representations, base thirteen, Tibetan monks are all complete nonsense. I sat at my desk, stared into the garden and thought '42 will do'. I typed it out. End of story.
Adams described his choice as 'a completely ordinary number, a number not just divisible by two but also six and seven. In fact it's the sort of number that you could without any fear introduce to your parents'.
While 42 was a number with no hidden meaning, Adams explained in more detail in an interview with Iain Johnstone of BBC Radio 4 (recorded in 1998 though never broadcast) to celebrate the first radio broadcast's 20th anniversary. Having decided it should be a number, he tried to think what an "ordinary number" should be. He ruled out non-integers, then he remembered having worked as a "prop-borrower" for John Cleese on his Video Arts training videos. Cleese needed a funny number for the punchline to a sketch involving a bank teller (himself) and a customer (Tim Brooke-Taylor). Adams believed that the number that Cleese came up with was 42 and he decided to use it.
Adams had also written a sketch for The Burkiss Way called "42 Logical Positivism Avenue", broadcast on BBC Radio 4 on 12 January 1977 – 14 months before the Hitchhiker's Guide first broadcast "42" in Fit the Fourth, 29 March 1978.
An excerpt from Douglas Adam's The Burkiss Way sketch, "Logical Positivism" excerpt
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In January 2000, in response to a panellist's "Where does the number 42 come from?" on the radio show "Book Club", Adams explained that he was "on his way to work one morning, whilst still writing the scene, and was thinking about what the actual answer should be. He eventually decided that it should be something that made no sense whatsoever – a number, and a mundane one at that. And that is how he arrived at the number 42, completely at random."
Stephen Fry, a friend of Adams, claims that Adams told him "exactly why 42", and that the reason is "fascinating, extraordinary and, when you think hard about it, completely obvious." However, Fry says that he has vowed not to tell anyone the secret, and that it must go with him to the grave. John Lloyd, Adams' collaborator on The Meaning of Liff and two Hitchhiker's fits, said that Adams has called 42 "the funniest of the two-digit numbers."
The number 42 appears frequently in the work of Lewis Carroll, and some critics have suggested that this was an influence. Other purported Carroll influences include that Adams named the episodes of the original radio series of The Hitchhiker's Guide to the Galaxy "fits", the word Carroll used to name the chapters of The Hunting of the Snark.
There is the persistent tale that 42 is Adams' tribute to the indefatigable paperback book, and is the average number of lines on an average page of an average paperback. Another common guess is that 42 refers to the number of laws in cricket, a recurring theme of the books.
The 42 Puzzle is a game devised by Douglas Adams in 1994 for the United States series of The Hitchhiker's Guide to the Galaxy books. The puzzle is an illustration consisting of 42 multi-coloured balls, in 7 columns and 6 rows. Douglas Adams has said,
Everybody was looking for hidden meanings and puzzles and significances in what I had written (like 'is it significant that 6×9 = 42 in base 13?'. As if.) So I thought that just for a change I would actually construct a puzzle and see how many people solved it. Of course, nobody paid it any attention. I think that's terribly significant.
In the puzzle the question is unknown, but the answer is already known to be 42. This is similar to the book where the "Answer to the Ultimate Question of Life, the Universe, and Everything" is known but not the question.
The puzzle first appeared in The Illustrated Hitchhiker's Guide to the Galaxy. It was later incorporated into the covers of all five reprinted "Hitchhiker's" novels in the United States.
Six of the solutions are:
|How many spheres are in the diagram? (six rows of seven is 42)||What position in the grid does the computer that calculates the Ultimate Question to the Answer (the Earth) occupy? (42)|
The barcode is the number 42 as an Interleaved 2 of 5 barcode
|Considering red-hued spheres (red, purple, orange, black) as a '1' and those without as a '0', what number does each line represent in decimal form? (In binary, each line reads '0101010', or '42' in decimal form.)||What number do the blue-tinted spheres (blue, green, purple, black) spell out? (Similar to a colour blindness test.) (42)||What number is represented by Roman numerals spelled out by the yellow-tinted spheres (yellow, orange, green, black) in the first three rows? (XLII = 42)|
Other solutions include...
7: The globe is centered at 42NLat, 42WLong.
8: The spheres with a yellow tint (yellow, dark yellow, green and black) spell out "XLII", 42 in Roman numerals, across the top three rows.
9: The light is shining on the spheres at a 42 degree angle.
10: The first purple sphere is 4 down and 2 over. The second purple sphere is mirrored at 2 in from the end and 4 down. The third one is. ???
11: Counting diagonally starting from the top green sphere down 4 spaces and then up 2 spaces, comes to another green sphere. This is mirrored with the top right sphere too.
The number 42 and the phrase, "Life, the universe, and everything" have attained cult status on the Internet. "Life, the universe, and everything" is a common name for the off-topic section of an Internet forum and the phrase is invoked in similar ways to mean "anything at all". Many chatbots, when asked about the meaning of life, will answer "42". Several online calculators are also programmed with the Question. If you type the answer to life the universe and everything into Google (without quotes or capitalisation), the Google Calculator will give you 42, as will Wolfram's Computational Knowledge Engine. Similarly, if you type the answer to the ultimate question of life, the universe and everything into DuckDuckGo, the 0-click box will read "42". In the online community Second Life, there is a section on a sim called "42nd Life." It is devoted to this concept in the book series, and several attempts at recreating Milliways, the Restaurant at the End of the Universe, were made.
In OpenOffice.org software, if you type into any cell of a spreadsheet =ANTWORT("Das Leben, das Universum und der ganze Rest") (German for =ANSWER("life, the universe and everything")), the result is 42.
ISO/IEC 14519-2001/ IEEE Std 1003.5-1999, IEEE Standard for Information Technology – POSIX(R) Ada Language Interfaces – Part 1: Binding for System Application Program Interface (API) , uses the number 42 as the required return value from a process that terminates due to an unhandled exception. The Rationale says "the choice of the value 42 is arbitrary" and cites the Adams book as the source of the value.
The random seed chosen to procedurally create the whole universe including all the regions, constellations, stars, planets, moons and mineral distribution of the online massively multi-player computer game EVE Online was chosen as 42 by its lead game designer in 2002.
In the computer game Gothic "42" is a code that deactivates all activated cheats. After typing "42" in a right place, text "What was the question?" appears.
In the American TV show Lost, 42 is the last of the mysterious numbers 4, 8, 15, 16, 23, and 42. In an interview with Lostpedia, producer David Fury confirmed this was a reference to Hitchhiker's.
Ken Jennings, defeated along with Brad Rutter in a Jeopardy match against IBM's Watson, writes that Watson's avatar which appeared on-screen for those games showed 42 "threads of thought," and that the number was chosen in reference to this meme.
In the series, Don't Panic is a phrase on the cover of The Hitchhiker's Guide to the Galaxy. The novel explains that this was partly because the device "looked insanely complicated" to operate, and partly to keep intergalactic travellers from panicking. "It is said that despite its many glaring (and occasionally fatal) inaccuracies, the Hitchhiker's Guide to the Galaxy itself has outsold the Encyclopedia Galactica because it is slightly cheaper, and because it has the words "DON'T PANIC" in large, friendly letters on the cover."
Somebody who can stay in control of virtually any situation is somebody who is said to know where his or her towel is. The logic behind this statement is presented in chapter 3 of The Hitchhiker's Guide to the Galaxy thus:
... a towel has immense psychological value. For some reason, if a strag (strag: nonhitchhiker) discovers that a hitchhiker has his towel with him, he will automatically assume that he is also in possession of a toothbrush, washcloth, soap, tin of biscuits, flask, compass, map, ball of string, gnat spray, wet-weather gear, space suit etc., etc. Furthermore, the strag will then happily lend the hitchhiker any of these or a dozen other items that the hitchhiker might accidentally have "lost". What the strag will think is that any man who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still knows where his towel is, is clearly a man to be reckoned with.
Adams got the idea for this phrase when he went travelling and found that his beach towel kept disappearing. In 'The Hitchhiker's Guide to the Galaxy -The Radio Scripts', his friends describe how he would always "mislay" his towel. On Towel Day, fans commemorate Adams by carrying towels with them.
The only entry about Earth in the Guide used to be "Harmless", but Ford Prefect managed to change it a little before getting stuck on Earth. "Mostly Harmless" provoked a very upset reaction from Arthur when heard. (Those two words are not what Ford submitted as a result of his research — merely all that was left after his editors were done with it.) It is the title of the fifth book in the Hitchhiker series. Its popularity is such that it has become the definition of Earth in many standard works of sci-fi reference, like The Star Trek Encyclopedia. Additionally, "Harmless" and "Mostly Harmless" both feature as ranks in the computer game Elite. Also, in World of Warcraft, there is a rifle that fires (mostly) harmless pellets. In the MMORPG RuneScape, there is an island called Mos Le Harmless (Mostly Harmless). Low-scoring players in the multiplayer version of the game Perfect Dark and GoldenEye 007 are awarded with the designation "mostly harmless". In the 2008 edition of the board game Cosmic Encounter, the Human race is given the attribute "Mostly Harmless."
In the novel The Restaurant at the End of the Universe, Arthur Dent tries to get a Nutrimatic drinks dispenser to produce a cup of tea. Instead, it invariably produces a concoction (which most people found unpleasant) that is "almost, but not quite, entirely unlike tea". One of the primary goals of the player, as Arthur Dent, in the computer game The Hitchhiker's Guide to the Galaxy, is to thwart the machine and find some decent tea, a mission that the player is constantly reminded of by the inventory item "no tea". According to the Jargon File, the briefer "not entirely unlike" has entered hacker jargon.
"Share and Enjoy" is the slogan of the Sirius Cybernetics Corporation Complaints Division. In the radio version, this phrase had its own song (sung in Fit the Ninth of the radio series), which was sung by a choir of robots during "special occasions". The Sirius Cybernetics Corporation tends to produce inherently faulty goods, which renders the statement ironic as few people would want to "Share and Enjoy" something defective. Among the design flaws is the choir of robots that perform this song: they sing a tritone out of tune with the accompaniment. The Guide relates that the words "Share and Enjoy" were displayed in illuminated letters three miles high near the Sirius Cybernetics Complaints Division, until their weight caused them to collapse through the underground offices of many young executives. The upper half of the sign that now protrudes translates in the local tongue as "Go stick your head in a pig", and is lit up only for special celebrations.
The episode Fit the Twentieth of the radio series features a personal computer OS booting sound (à la The Microsoft Sound) set to the tune of "Share and Enjoy". Furthermore, Fit the Twenty-First of the radio series, the last episode in the adaption of the novel So Long, and Thanks for All the Fish, features a polyphonic ringtone version of the tune. The "Share and Enjoy" tune also is used in the TV series as the backing for a Sirius Cybernetics Corporation robot commercial (slogan: "Your plastic pal who's fun to be with!").
Apparently unaware of the reference, Mars has also been using the phrase on bags of Revels, M&M's and Maltesers. The phrase is currently also being used on posters outside some McDonald's restaurants in the UK.
After mice, the second most intelligent species on Earth were the dolphins.
The dolphins had long known of the impending demolition of Earth and had made many attempts to alert mankind to the danger...The last ever dolphins message was misinterpreted as a surprisingly sophisticated attempt to do a double backward somersault through a hoop whilst whistling "The Star-Spangled Banner," but in fact the message was this: "So Long, and Thanks for All the Fish."—Douglas Adams, The Hitchhiker's Guide to the Galaxy
The line was also the title of the fourth book in the trilogy, and appears in that book as a message inscribed on crystal bowls left as parting gifts from the dolphins to the human race. Its popularity was such that it was the title of the opening song for the 2005 movie The Hitchhiker's Guide to the Galaxy.
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