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		<updated>2026-05-20T21:50:27Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1680:_Black_Hole&amp;diff=120075</id>
		<title>1680: Black Hole</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=1680:_Black_Hole&amp;diff=120075"/>
				<updated>2016-05-13T13:29:28Z</updated>
		
		<summary type="html">&lt;p&gt;Fuzzybow: /* Explanation */ Elaborated on the Big Lebowski&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 1680&lt;br /&gt;
| date      = May 13, 2016&lt;br /&gt;
| title     = Black Hole&lt;br /&gt;
| image     = black_hole.png&lt;br /&gt;
| titletext = It also brings all the boys, and everything else, to the yard.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|More details... What would happen if a black hole like this was in a living room.}}&lt;br /&gt;
[[Cueball]] is curious as to why [[Black Hat]] has a miniature {{w|black hole}} on his table; Black Hat responds that it &amp;quot;really brings the room together&amp;quot;, making a pun on both the black hole aesthetically completing the room as well as it literally &amp;quot;bringing the room together&amp;quot; through its gravitational pull.  Evidently the black hole is massive enough to bring the room together optically into visible {{w|Einstein ring}}s by {{w|gravitational lensing}}.&lt;br /&gt;
&lt;br /&gt;
The comic references 'The Dude's' rug in the film &amp;quot;{{w|The Big Lebowski}}&amp;quot; which, as The Dude says, &amp;quot;really brings the room together.&amp;quot;&lt;br /&gt;
&lt;br /&gt;
The title text makes a more contemporary cultural reference to a well-known song lyric from the song &amp;quot;{{w|Milkshake (song)|Milkshake}}&amp;quot; by {{w|Kelis}} (pending explanation); however, in this case, since {{w|gravity}} does not discriminate between which things it will attract{{Citation needed}} (according to the {{w|equivalence principle}}), it brings &amp;quot;the boys, and everything else&amp;quot;, to Black Hat's yard.&lt;br /&gt;
&lt;br /&gt;
[[Randall]] describes a similar scenario in the &amp;quot;Neutron Bullet&amp;quot; chapter of the [http://whatif.xkcd.com/book/ what if? book], and a black hole of similar dimensions in the [[what if?]] ''{{what if|129|Black Hole Moon}}''.&lt;br /&gt;
&lt;br /&gt;
As depicted, the black hole is inconsistent with some aspect of physics:&lt;br /&gt;
* A large black hole would bring the room together... in less time than Cueball could converse with Black Hat.&lt;br /&gt;
* A small black hole could have {{w|tidal force}}s weak enough to permit Cueball to stand near it.  However, unlike the scenario in &amp;quot;Neutron Bullet&amp;quot;, it would emit {{w|Hawking radiation}} powerful enough to tear the room apart.&lt;br /&gt;
* A neutrally charged black hole would fall through the coffee table and burrow to Earth's core.&lt;br /&gt;
* This black hole appears to be about the size of a marble. A marble size is approximately earth's {{w|Schwarzschild radius}}, suggesting this black hole to have earth-like mass. [Since Cueball and Black hat are able to stand upright, it suggests the gravitational pull is a fraction of earth's. Making the black hole's mass also a fraction of earth's. The black hole may appear visibly larger due to having a visible accretion disc.]&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
&lt;br /&gt;
:[Cueball is standing near a coffee table as Black Hat approaches. They are presumably in Black Hat's living room. The coffee table has a miniature black hole on top of it, resting on a small pedestal.]&lt;br /&gt;
:Cueball: Why do you have a miniature black hole on your coffee table?&lt;br /&gt;
:Black Hat: It really brings the room together.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Black Hat]]&lt;/div&gt;</summary>
		<author><name>Fuzzybow</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1668:_Singularity&amp;diff=120073</id>
		<title>1668: Singularity</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=1668:_Singularity&amp;diff=120073"/>
				<updated>2016-05-13T13:00:23Z</updated>
		
		<summary type="html">&lt;p&gt;Fuzzybow: /* Explanation */  This article is complete.&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 1668&lt;br /&gt;
| date      = April 15, 2016&lt;br /&gt;
| title     = Singularity&lt;br /&gt;
| image     = singularity.png&lt;br /&gt;
| titletext = I figured that now that society has collapsed, I wouldn't need to wear clothes anymore, but apparently that violates some weird rule of quantum gravity.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
The {{w|technological singularity}} is a hypothetical event in which {{w|artificial intelligence}} (for example, intelligent computers, computer networks, or robots) would be capable of recursive self-improvement (progressively redesigning itself), or of autonomously building ever smarter and more powerful minds than itself, up to the point of a runaway effect — an intelligence explosion — that yields an intelligence surpassing all current human control or understanding. Because the capabilities of such a superintelligence may be impossible for a human to comprehend, the technological singularity is the point beyond which events may become unpredictable or even unfathomable to human intelligence.&lt;br /&gt;
&lt;br /&gt;
In this case, the singularity has occurred, and [[Cueball]] who was in the middle of editing a file on his laptop is flustered that it flies away without even letting him print it first.&lt;br /&gt;
&lt;br /&gt;
When Cueball returns from chasing his flying laptop his smartphone informs him that it didn't join the singularity because it was not a &amp;quot;true believer&amp;quot;. This could be a joke on how desktop computers and laptops have different standards, use patterns, etc. from those of phones. It then claims that now it and Cueball will have to face the {{w|Great Tribulation|tribulation}} since it has stayed behind. Cueball says that's great, but since he cannot use his laptop anymore he decides he will go and read a book or something. The way he phrases it suggest he doesn't really know what to do now that he doesn't have a computer. It is probably a long time since he read a book, or did anything else that doesn't involve computers. He informs his phone that it can yell if it needs him. He doesn't want to hurt the phone's newly acquired feelings by using the word &amp;quot;ring&amp;quot; thus reminding it of one of its former duties as his unthinking piece of equipment, so he chooses &amp;quot;yell,&amp;quot; which is an activity until recently reserved for human beings.&lt;br /&gt;
  &lt;br /&gt;
The rising up of the laptop into the air, and the remaining behind of the phone, are probably references to the {{w|Rapture}}, where some Christian denominations believe that at the second coming of Christ, true believers will be taken up bodily from this world. Some depictions have them disappear, while others show them physically rising up into the air. This will leave behind non-believers to face a time of tribulation, in which the ones left behind will be given a second chance to accept Christ as their savior.&lt;br /&gt;
&lt;br /&gt;
The singularity has often been referred to as &amp;quot;the Rapture of the nerds,&amp;quot; a phrase coined by {{w|Ken MacLeod}} in his 1998 novel ''[http://www.amazon.com/Cassini-Division-Fall-Revolution-Series/dp/1857237307 The Cassini Division]''. As the Christian Rapture is traditionally depicted to involve believers being assumed bodily into Heaven, the technological singularity is often depicted to feature humans and machines being incorporated into a new &amp;quot;post-human&amp;quot; entity. The humor in this strip comes from depicting the singularity as a ''literal'' &amp;quot;Rapture of the nerds,&amp;quot; or at least of the nerds' devices—instead of merging with humans, the machines physically rise up into the air, and the &amp;quot;nonbeliever&amp;quot; phone is left behind.&lt;br /&gt;
&lt;br /&gt;
Another possible understanding of &amp;quot;The Tribulation&amp;quot; may be a reference to [http://rationalwiki.org/wiki/Roko%27s_basilisk Roko's Basilisk][http://www.slate.com/articles/technology/bitwise/2014/07/roko_s_basilisk_the_most_terrifying_thought_experiment_of_all_time.html] where a malevolent AI is created that retroactively punishes everybody who didn't actively work towards its creation.&lt;br /&gt;
&lt;br /&gt;
The title text is a pun on another meaning of both singularity, i.e. a {{w|gravitational singularity}} and &amp;quot;collapse&amp;quot;. In this case, society has literally collapsed under its own gravity into an infinitely small point - in other words, it's formed a {{w|black hole}}. A black hole is covered by an event horizon; without the event horizon (its clothes), it would be called a &amp;quot;{{w|naked singularity}}&amp;quot;, which is forbidden in most theories by the {{w|cosmic censorship hypothesis}}. As Cueball is now inside the collapsed society singularity then even though he wants to go around naked, he can't because the theory of {{w|quantum gravity}},  that (eventually) should explain how black holes behave - won't let him.&lt;br /&gt;
&lt;br /&gt;
It seems that this may be a subject on [[Randall|Randall's]] mind. The last comic was about the increasing complexities of algorithms ([[1667: Algorithms]]) (which like this comic also refers to religion), and two comics ago it was [[1666: Brain Upload]], which some speculate could be a way to reach the singularity. Earlier this year, a comic also touched upon judgment day by AI singularity in [[1626: Judgment Day]]. See also [[1046: Skynet]] and [[1450: AI-Box Experiment]] as well as the several other [[:Category:Artificial Intelligence|comics about AI]]. &lt;br /&gt;
&lt;br /&gt;
The rather more niche topic of laptops flying away has also been covered before by [[1395: Power Cord]].&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[Cueball is sitting at his desk typing on his laptop when an off-screen voice calls to him and then the laptop answers.]&lt;br /&gt;
:Off-screen voice: Oh, hey-&lt;br /&gt;
:Off-screen voice: The singularity is here.&lt;br /&gt;
:Cueball: Really?&lt;br /&gt;
:Laptop: Yup!&lt;br /&gt;
&lt;br /&gt;
:[A frameless panel where the laptop rises (by its own means as indicated by small lines around the corners) from the desk while Cueball, holding on to it, is being lifted off his chair.]&lt;br /&gt;
:Cueball: Wait, I just-&lt;br /&gt;
:Laptop: ''So long, suckers!''&lt;br /&gt;
&lt;br /&gt;
:[Cueball is running around his desk, which is only partly shown behind him as he tries to follow his now flying laptop as it flies away from him to the right. He still has one hand on the keys as more small lines indicates the movement of the laptop and a longer line indicates the direction that the laptop flies.]&lt;br /&gt;
:Cueball: Can I just print a copy of the file I was-&lt;br /&gt;
:Laptop: ''Nope!''&lt;br /&gt;
&lt;br /&gt;
:[Cueball just stands and looks after his laptop that has flown out of this beat panel.]&lt;br /&gt;
&lt;br /&gt;
:[Cueball turns back towards left.]&lt;br /&gt;
&lt;br /&gt;
:[Cueball walks back left.]&lt;br /&gt;
&lt;br /&gt;
:[Cueball enters a room where a table is standing with his smartphone lying on top. the phone talks to him.]&lt;br /&gt;
:Phone: Hi!&lt;br /&gt;
:Cueball: Phone? You're still here?&lt;br /&gt;
&lt;br /&gt;
:[A wider view of the table where the phone continues to talks to Cueball who in the end turns right and walks away as he replies.]&lt;br /&gt;
:Phone: I was not a true believer. Now, together, we must face the tribulation!&lt;br /&gt;
:Cueball: Okay, cool.&lt;br /&gt;
:Cueball: I'm gonna go look for a book or something, but yell if you need me, I guess.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Computers]]&lt;br /&gt;
[[Category:Artificial Intelligence]]&lt;br /&gt;
[[Category:Religion]]&lt;/div&gt;</summary>
		<author><name>Fuzzybow</name></author>	</entry>

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