explain xkcd - User contributions [en]

1377: Fish

2014-06-04T15:52:21Z

Muish: /* Explanation */ removing comment under discussion

{{comic
| number = 1377
| date = June 4, 2014
| title = Fish
| image = fish.png
| titletext = [Astronomer peers into telescope] [Jaws theme begins playing]
}}

==Explanation==
The {{w|Fermi Paradox}} is the contradiction that arises between the high likelihood of {{w|extraterrestial life}} and the fact that no evidence for it has thus far been found.

[[Cueball]] and [[Megan]] are having a conversation regarding this, when Megan suggests that perhaps our search for extraterrestrial life is like looking at a patch of ocean floor looking for a fish. The diver knows that there must be a fish somewhere, but is unable to actually find it. She then goes on to ask why the fish would be hidden - i.e. camouflaged, and what it means about the remaining fish. The suggestion is that the fish would be hidden to avoid being eaten by predators, and perhaps the reason no extraterrestrial life is sending any sign of existence back is that they fear they might be destroyed soon after they revealed their location.

The final panels take the metaphor further, suggesting that there is literally a planet sized shark swimming through space eating planets, and since we are panning away from earth and out to the shark it is obviously heading our way... And it turns out that Earth is the next fish!

This explains the title text that has the theme from the movie ''{{w|Jaws (film)|Jaws}}'' playing while astronomers look into their telescopes. This may also be a reference to the film ''{{w|Alien (film)|Alien}}'', which was pitched with the three word proposal "''Jaws'' in Space."

==Transcript==
{{incomplete transcript}}

[Cueball and Megan are walking down a hill]

Cueball: The Fermi paradox keeps getting worse. If planets are common, where '''is''' everybody?

Megan: Imagine you're a SCUBA diver looking at the ocean floor. You know there's a fish there, but you can't see it. Why?

Cueball: Maybe the fish looks like sand.

Megan: Yeah...

[Zoom out to the Earth from space]

Megan: ...and what would that tell you about the ecosystem?

[Pan to a shark swimming through space towards Earth]

{{comic discussion}}

Talk:1377: Fish

2014-06-04T15:51:55Z

Muish: wrong user name..

I took it to mean that we are the camouflaged fish and the extraterrestrials are the shark. We have been naturally selected to be hard to find through some means, probably by distance from a predator life form or just being tiny, and have thus not encountered any of them. -- [[User:Irino|Irino]] ([[User talk:Irino|talk]]) 06:57, 4 June 2014 (UTC)

So, Fermi's paradox is a good defense for why you caught no fish, even though "there's plenty of fish in the sea." [[Special:Contributions/103.22.201.239|103.22.201.239]] 09:06, 4 June 2014 (UTC)
:Not the Fermi paradox itself, that just questions why we could not find an evidence of extraterrestrial life out there, but this possible explanation of it. There are also other possible explanations, [http://en.wikipedia.org/wiki/Fermi_paradox#Explaining_the_paradox_hypothetically see Wikipedia] for them. [[User:Sten|'''STEN''']] ([[User talk:Sten|talk]]) 15:50, 4 June 2014 (UTC)

The most probable predator to civilizations is another civilization. There may be civilization out there which is so scary everyone is quiet so they don't find him. Wait ... WE may be that civilization. Half of civilization in our galaxy fears the battleships from our sci-fi shows because they thinks they are real and the other half fears that civilization with that kind of shows is going to build real battleships soon.
Ok, seriously, I already commented elsewhere ... we don't have anything so valuable it would be worth the resources needed for sending attack fleet here. We would need to REALLY piss someone off to be attacked. At least ... physically. Hey, those telescopes searching for signals from other civilization ... how good antivirus protection they have? -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 10:22, 4 June 2014 (UTC)

:We don't have anything valuable so long as another civilization doesn't need and earth sized supply of calcium, potassium, sodium, nickle, and iron.--[[User:Bmmarti3|Bmmarti3]] ([[User talk:Bmmarti3|talk]]) 12:34, 4 June 2014 (UTC)

::We do have pet ferrets. They are cute, It is unlikely that there is another source of pet ferrets in the galaxy. [[Special:Contributions/108.162.219.77|108.162.219.77]] 13:32, 4 June 2014 (UTC)

I think the problem is that traditional SETI methods are of dubious effectiveness at actually detecting radio transmissions from other civilizations due to the low initial power of said transmissions which then only get weaker as they propagate. Switch to our new optical methods of planet detection which have detected scores of planets in just a few years and the "paradox" might need to be reevaluated. Optical detection also makes it doubtful that any civilization would be able to effectively hide. [[User:Sturmovik|Sturmovik]] ([[User talk:Sturmovik|talk]]) 12:45, 4 June 2014 (UTC)

By the way, the Chinese sci-fi writer {{w|Liu Cixin}} has published a {{w|Three Body (science_fiction)|trilogy}} called "Three Body", focusing on this idea (he called it "dark forest"): what if all the visible civilizations have been destroyed? What if revealing your neighbor's location to the universe is similar to the MAD ({{w|Mutual assured destruction}}) situation? The English version should hit the market this year. --[[User:Ent|Ent]] ([[User talk:Ent|talk]]) 15:51, 4 June 2014 (UTC)

Talk:1377: Fish

2014-06-04T15:51:25Z

Muish: moving a clear comment under discussion

I took it to mean that we are the camouflaged fish and the extraterrestrials are the shark. We have been naturally selected to be hard to find through some means, probably by distance from a predator life form or just being tiny, and have thus not encountered any of them. -- [[User:Irino|Irino]] ([[User talk:Irino|talk]]) 06:57, 4 June 2014 (UTC)

So, Fermi's paradox is a good defense for why you caught no fish, even though "there's plenty of fish in the sea." [[Special:Contributions/103.22.201.239|103.22.201.239]] 09:06, 4 June 2014 (UTC)
:Not the Fermi paradox itself, that just questions why we could not find an evidence of extraterrestrial life out there, but this possible explanation of it. There are also other possible explanations, [http://en.wikipedia.org/wiki/Fermi_paradox#Explaining_the_paradox_hypothetically see Wikipedia] for them. [[User:Sten|'''STEN''']] ([[User talk:Sten|talk]]) 15:50, 4 June 2014 (UTC)

The most probable predator to civilizations is another civilization. There may be civilization out there which is so scary everyone is quiet so they don't find him. Wait ... WE may be that civilization. Half of civilization in our galaxy fears the battleships from our sci-fi shows because they thinks they are real and the other half fears that civilization with that kind of shows is going to build real battleships soon.
Ok, seriously, I already commented elsewhere ... we don't have anything so valuable it would be worth the resources needed for sending attack fleet here. We would need to REALLY piss someone off to be attacked. At least ... physically. Hey, those telescopes searching for signals from other civilization ... how good antivirus protection they have? -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 10:22, 4 June 2014 (UTC)

:We don't have anything valuable so long as another civilization doesn't need and earth sized supply of calcium, potassium, sodium, nickle, and iron.--[[User:Bmmarti3|Bmmarti3]] ([[User talk:Bmmarti3|talk]]) 12:34, 4 June 2014 (UTC)

::We do have pet ferrets. They are cute, It is unlikely that there is another source of pet ferrets in the galaxy. [[Special:Contributions/108.162.219.77|108.162.219.77]] 13:32, 4 June 2014 (UTC)

I think the problem is that traditional SETI methods are of dubious effectiveness at actually detecting radio transmissions from other civilizations due to the low initial power of said transmissions which then only get weaker as they propagate. Switch to our new optical methods of planet detection which have detected scores of planets in just a few years and the "paradox" might need to be reevaluated. Optical detection also makes it doubtful that any civilization would be able to effectively hide. [[User:Sturmovik|Sturmovik]] ([[User talk:Sturmovik|talk]]) 12:45, 4 June 2014 (UTC)

By the way, the Chinese sci-fi writer {{w|Liu Cixin}} has published a {{w|Three Body (science_fiction)|trilogy}} called "Three Body", focusing on this idea (he called it "dark forest"): what if all the visible civilizations have been destroyed? What if revealing your neighbor's location to the universe is similar to the MAD ({{w|Mutual assured destruction}}) situation? The English version should hit the market this year. --[[User:Ent|Sturmovik]] ([[User talk:Ent|talk]]) 15:51, 4 June 2014 (UTC)

1237: QR Code

2013-07-13T08:46:26Z

Muish: /* Explanation */ put raw decoding result in article text

{{comic
| number = 1237
| date = July 12, 2013
| title = QR Code
| image = qr code.png
| titletext = Remember, the installer is watching the camera for the checksum it generated, so you have to scan it using your own phone.
}}

==Explanation==
{{W|QR code}}s are a type of 2D barcode that can be scanned using any of several apps on a smartphone. This comic illustrates installation of a new application that requires the smartphone to scan a QR code on its own screen. There is no conceivable purpose for such a step, so it would be completely silly. Even with two mirrors or a front-facing camera and mirror, most smartphones would be unable to simultaneously display the camera feed for the QR scanner and the QR code itself.

If scanned, the QR code in the comic reads <tt>http://xkcd.com/1237/scan/</tt>, a link to a nearly identical image, but the line above the QR code says, "To continue reading," and a slightly changed caption reads, "How to trap a webcomic reader in an infinite loop". The QR code is identical to the previous one. So, if scanned again, it would be an "infinite loop" without any purpose.

==Transcript==
:[A mobile phone screen.]
:To continue installing,
:[Image of a QR code which contains a link.]
:Scan this code.
:12 Seconds remaining

:How to freak out a mobile app user

==Trivia==
*Randall jokes about Webcomic Readers, trying to find all the secrets he hides. Nobody did find and publish them all right now.

{{comic discussion}}

1137: RTL

2012-11-21T14:33:36Z

Muish: add special character to name

{{comic
| number = 1137
| date = November 21, 2011
| title = ‮LTR
| image = rtl.png
| imagesize =
| titletext = Collaborative editing can quickly become a textual rap battle fought with increasingly convoluted invocations of U+202a to U+202e
}}

==Explanation==
U+202e is a {{w|unicode control characters|unicode control character}} that changes all proceeding text to right-to-left (RTL, as the title references). In the comic, [[Black Hat]] tires of [[Cueball]]'s complaining and inserts a U+202e character in the middle of Cueball's speech, turning his complaints into gibberish. U+202c returns text back to its normal direction.

When multiple writers work on the same text, arguments can often arise with some writers resorting to vandalizing the works of other writers. The title text takes this up a level, suggesting the use of U+202e and other direction control characters in editor wars to disrupt other people's work.

==Transcript==
:[Cueball and Black Hat. Cueball is standing. Black Hat is sitting down and using a laptop.]
:Cueball: And that's not even the worst part! The ''worst'' part is that—
:Black Hat: U+202e
:Cueball: ...neve t'ndid yehT—
:Cueball: ?lleh eth tahW...
:Cueball: ...uoy did woH
:Cueball: .elohssA...

==Trivia==
* The title of the comic on the xkcd website actually has a U+202e character preceding it; when copied and pasted, the title of the comic actually reads "LTR". The page title is "xkcd: [U+202e]LTR", which causes Firefox to use "xkcd: xoferiF allizoM - RTL" as the window title. This also occurs in Chromium and Opera.
* There is a typo in the reverse text. "eth" corresponds to "hte" in stead of "the".

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Black Hat]]