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		<updated>2026-04-14T07:50:39Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=819:_Five-Minute_Comics:_Part_1&amp;diff=150150</id>
		<title>819: Five-Minute Comics: Part 1</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=819:_Five-Minute_Comics:_Part_1&amp;diff=150150"/>
				<updated>2018-01-02T21:23:32Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.238.107: reference to Ed Gein&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 819&lt;br /&gt;
| date      = November 15, 2010&lt;br /&gt;
| title     = Five-Minute Comics: Part 1&lt;br /&gt;
| image     = five minute comics part 1.png&lt;br /&gt;
| titletext = The wolves thin the RAID arrays, removing the slowest and weakest disks to keep the average seek speed high.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
This is the first of three &amp;quot;five-minute comics&amp;quot; Randall posted during a week in November 2010. The introduction to the comic explains everything you need to know about the circumstances behind it. &lt;br /&gt;
&lt;br /&gt;
Randall obviously made more than three of these five minutes comics, and one of them was published later, for a short period of time by a mistake, but an android xkcd browser picked it up while it was on-line and saved it. Since then it has been added to explain xkcd. So here is a complete list of all four comics in the entire [[:Category:Five-minute comics|Five-minute comics]] series:&lt;br /&gt;
*[[819: Five-Minute Comics: Part 1]]&lt;br /&gt;
*[[820: Five-Minute Comics: Part 2]]&lt;br /&gt;
*[[821: Five-Minute Comics: Part 3]]&lt;br /&gt;
*[[Five-Minute Comics: Part 4]]&lt;br /&gt;
&lt;br /&gt;
Here is a list with explanations for each of the small comics:&lt;br /&gt;
*In astronomy, an &amp;quot;approach&amp;quot; is when two bodies come abnormally close to one another, but not close enough to crash. {{w|Jupiter}}, as most probably know, is the fifth planet in our solar system. Its approach to Earth in September 2010 was the closest seen in many years - in fact, the next time it will come that close will be in 2022. In the comic, this is indicated by Jupiter hovering right above Earth and talking to the characters.&lt;br /&gt;
:Of course, Jupiter is not only planet-sized, but is ''enormous'' compared to Earth; in fact, Earth would fit quite comfortably into the {{w|Atmosphere of Jupiter#Great Red Spot|red spot}} of Jupiter.&lt;br /&gt;
:Gravitational slingshots are used by deep-space probes to gain speed by approaching a planet and then leaving that planet; the gravity fields of the sun and the planet changes the trajectory of the probe, and the end result is an extremely fuel-efficient way of gaining speed during space travel. Jupiter is commonly used for this purpose because it's the most massive planet in our solar system.&lt;br /&gt;
&lt;br /&gt;
*The comic in the middle left features the lyrics to the Johnny Cash song {{w|A Boy Named Sue}}, but with &amp;quot;Sue&amp;quot; replaced with &amp;quot;Trig.&amp;quot; Inexplicably, [http://wiki.name.com/en/Trig Trig] is a name that people actually give their children. The most notable example in the US - and probably the inspiration for Randall drawing this comic - is Trig Palin, the son of Alaskan politician Sarah Palin. Trig is also a widely accepted abbreviation for the mathematical field of {{w|trigonometry}}, and it sounds similar to &amp;quot;twig,&amp;quot; so one can imagine how a person with such a name might be ridiculed.&lt;br /&gt;
&lt;br /&gt;
*A child getting trapped in a well is an alien experience to some parts of the Western world, but it's quite a serious problem in places where wells are commonplace. Here, though, rather than attempt to rescue the little girl, Cueball instead tries to grant her wish of owning a pony before her imminent demise; a pony is a stereotypical thing for a little girl to want. Of course, since ponies don't fit into wells too easily, he has to stuff it in, which appears to be quite painful for the pony.&lt;br /&gt;
&lt;br /&gt;
*The server room of a large datacenter is an unusual place to return &amp;quot;back to nature&amp;quot;, to say the least. {{w|Reintroduction}} refers to the process of taking a population of animals raised in captivity and bringing them back to the wild; this is a delicate process, as being raised in captivity affects the natural development of skills the animal needs to survive. In fact, Wikipedia has a page specifically about the challenges of {{w|wolf reintroduction}}.&lt;br /&gt;
:Needless to say, reintroducing wolves to a server room is neither a good idea nor OSHA-approved.&lt;br /&gt;
:Cueball may also be referencing a computer program named &amp;quot;reintroduction&amp;quot; or something similar when he says &amp;quot;We started a reintroduction program&amp;quot;&lt;br /&gt;
:The title-text refers to the wolves thinning the RAID array. A {{w|RAID|RAID array}} is a way of spreading data redundantly across multiple hard drives, such that 100% of the data is still recoverable if some number of drives go down. This number can be set arbitrarily, as long as you have at least one more disk than the number you want, but it reduces your total storage space accordingly. The seek speed of a drive is how fast it can find a specific point of data on its platter; thus, the wolves are essentially killing the slowest drives, implementing a kind of natural selection to &amp;quot;evolve&amp;quot; the drives to be faster.&lt;br /&gt;
&lt;br /&gt;
*Directly below the previous comic, Cueball is telling a &amp;quot;yo mama&amp;quot; joke. Such jokes are usually told in jest, and aren't really targeted at a particular person's mother; however, in this case, Cueball ''was'' attempting to make an honest observation about the listener's mother, and when he discovers his mistake, he realizes that she is, in fact, quite a nice person. Alternatively, Cueball is insulting the femininity of the listener's mother, and the masculinity of the listener's father.&lt;br /&gt;
&lt;br /&gt;
*{{w|Wolfgang Amadeus Mozart}} wrote an opera called ''{{w|The Magic Flute}}'', though the comic seems to attribute it to {{w|Johann Sebastian Bach|Bach}}. {{w|Richard Wagner}} wrote a series of operas called {{w|Der Ring des Nibelungen}}, or, more commonly, the ring cycle. Here, Randall interprets the ring cycle as some kind of motorcycle, while the teleporting magic flute comes from video games: in both ''The Legend of Zelda'' and ''Super Mario Bros. 3'', the player can obtain a magic flute item that has teleportation powers. In the Magic Tree House series, the magic flute is an actual magical flute that does magic when played, although it does not teleport people.  &lt;br /&gt;
:The caption implies that even Randall is not sure what meaning this comic has.&lt;br /&gt;
:However, as he has made a mash up of Mozart, Bach and Wagner - this must be intentional - so ''he'' does not attribute the Magic Flute to Bach! &lt;br /&gt;
&lt;br /&gt;
*This comic shows how people rate the &amp;quot;hotness&amp;quot; of girls. Glamour magazines have desensitized many people to photo-edited models with large amounts of make-up, so the model gets a &amp;quot;meh&amp;quot; reaction. The girl in biology class, by contrast, is not only &amp;quot;real&amp;quot; by comparison, but is actually a viable choice for dating, so she is given a 2 star rating. If the same girl from bio class is wearing your shirt, that usually means you've had sex the night before, and she spent the night at your apartment, hence the need to get dressed in one of your shirts; this possibility earns the highest rating, 4 stars.&lt;br /&gt;
:Here it starts taking a turn for the worse. If wearing one of ''your'' shirts means she spent the night with ''you'', logically, wearing one of your ''mom's'' shirts means she spent the night with ''your mom''. This earns a &amp;quot;Wat!&amp;quot; reaction.&lt;br /&gt;
:Finally, human skin is not generally designed to detach from its owner{{Citation needed|reason=Prove it|date=November 2015}}. If the girl from your bio class is wearing your mom's skin like a suit, it means she probably murdered your mom and skinned her. This is a reference to serial killer {{w|Ed Gein}}, who (among other things) made suits out of the skin of some of his victims. To this, Cueball can only scream.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
Because of a family illness, instead of regular comics, this week I'll be sharing some strips that I drew as part of a game I played with friends. Each comic had to be written and drawn in five minutes. -- Randall&lt;br /&gt;
&lt;br /&gt;
====Comic #1====&lt;br /&gt;
:[Cueball and Megan stand facing each other.]&lt;br /&gt;
:Cueball: Jupiter will make its closest approach to Earth in decades.&lt;br /&gt;
&lt;br /&gt;
:[Cueball points behind Megan, and she turns around.]&lt;br /&gt;
:Cueball: In fact, here it comes now!&lt;br /&gt;
&lt;br /&gt;
:[Jupiter, about the size of the characters' heads, hovers into the frame at about head-height.]&lt;br /&gt;
:Jupiter: Hey, guys.&lt;br /&gt;
&lt;br /&gt;
:[Jupiter continues to hover through the frame as the characters watch it go.]&lt;br /&gt;
:Jupiter: Anyone need a gravitational slingshot?&lt;br /&gt;
:Megan: No, I'm good.&lt;br /&gt;
:Jupiter: Aight.&lt;br /&gt;
&lt;br /&gt;
====Comic #2====&lt;br /&gt;
:[Cueball sits on a box, playing a guitar.]&lt;br /&gt;
:Cueball: ...Now I don't blame him 'cause he ran and hid,&lt;br /&gt;
:Cueball: but the meanest thing that he ever did&lt;br /&gt;
:Cueball: was before he left, he went and named me &amp;quot;Trig.&amp;quot;&lt;br /&gt;
&lt;br /&gt;
====Comic #3====&lt;br /&gt;
:[Cueball looks down a well.]&lt;br /&gt;
:Cueball: Oh God, a little girl is trapped down this well!&lt;br /&gt;
&lt;br /&gt;
:[Cueball runs off screen.]&lt;br /&gt;
&lt;br /&gt;
:[Cueball returns, leading a pony.]&lt;br /&gt;
:Cueball: It's okay, we got you that pony you always wanted!&lt;br /&gt;
&lt;br /&gt;
:[Cueball tries to cram the pony down the well with the aid of a large stick.]&lt;br /&gt;
:Cueball: Get... in... there...&lt;br /&gt;
:Cueball: Ugh!&lt;br /&gt;
&lt;br /&gt;
====Comic #4====&lt;br /&gt;
:[Cueball and Megan stand in a server room. ]&lt;br /&gt;
:Cueball: I like to get back to nature by coming out here to the server room.&lt;br /&gt;
:Cueball: The warmth, the whirr of the drives, the drone of the fans, the howl of the wolves...&lt;br /&gt;
:Megan: Wolves?&lt;br /&gt;
:Cueball: Yeah, we started a reintroduction program.&lt;br /&gt;
:Wolf: Awoooooo&lt;br /&gt;
&lt;br /&gt;
====Comic #5====&lt;br /&gt;
:[Cueball stands by himself in the frame.]&lt;br /&gt;
:Cueball: Yo momma's so masculine that she... oh, wait, that's your dad.&lt;br /&gt;
:Cueball: Is your mom the lady over by the door? Aww, she looks nice!&lt;br /&gt;
&lt;br /&gt;
====Comic #6====&lt;br /&gt;
:[Cueball runs toward another man who is wearing a powdered wig, holding a gun in one hand, and a flute in the other. Behind him, someone is chasing him on a motorcycle.]&lt;br /&gt;
:Cueball: Bach, activate the magic flute and teleport us home! Wagner's right behind me on his Ring Cycle!&lt;br /&gt;
&lt;br /&gt;
:Why did I ''draw'' this?&lt;br /&gt;
&lt;br /&gt;
====Comic #7====&lt;br /&gt;
:Hotness Ratings:&lt;br /&gt;
:[A close up of a girl with wavy hair.]&lt;br /&gt;
:Incredibly made-up girl on magazine cover.&lt;br /&gt;
:Girl: Airbrush!&lt;br /&gt;
:[Inset of Cueball: &amp;quot;Meh.&amp;quot;]&lt;br /&gt;
&lt;br /&gt;
:[An average girl.]&lt;br /&gt;
:Girl in your bio class.&lt;br /&gt;
:[Inset of Cueball: &amp;quot;Two stars.&amp;quot;]&lt;br /&gt;
&lt;br /&gt;
:[Girl with mussed hair in over-sized men's shirt.]&lt;br /&gt;
:Girl in your bio class wearing one of your shirts.&lt;br /&gt;
:Girl: Want some breakfast?&lt;br /&gt;
:[Cueball: &amp;quot;Four stars.&amp;quot;]&lt;br /&gt;
&lt;br /&gt;
:[Girl with another sort of shirt speaking to an older lady.]&lt;br /&gt;
:Girl in your bio class wearing one of your mom's shirts.&lt;br /&gt;
:Girl: Thanks for the great night.&lt;br /&gt;
:[Cueball: &amp;quot;Wat!&amp;quot;]&lt;br /&gt;
&lt;br /&gt;
:[Creepy-looking girl.]&lt;br /&gt;
:Girl in your bio class wearing your mom's skin like a suit.&lt;br /&gt;
:Girl: Give Mommy a hug!&lt;br /&gt;
:[Cueball, screaming: &amp;quot;AAAAAAAA&amp;quot;]&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Five-minute comics| 01]]&lt;br /&gt;
[[Category:Comics sharing name|Five-minute comics]]&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Physics]]&lt;br /&gt;
[[Category:Music]]&lt;br /&gt;
[[Category:Your Mom]]&lt;/div&gt;</summary>
		<author><name>162.158.238.107</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:1935:_2018&amp;diff=150004</id>
		<title>Talk:1935: 2018</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:1935:_2018&amp;diff=150004"/>
				<updated>2017-12-30T17:40:48Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.238.107: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
This is easy! Don't factor it - just multiply by 25 and if that ends in two zeros, but not four zeros then it's a leap year, at least most of the time.....17:25, 29 December 2017 (UTC) {{unsigned ip|162.158.126.112}}&lt;br /&gt;
&lt;br /&gt;
This is easy! Don’t factor it - just convert it into a binary and look at the 2 least significant bits. If they are 00 the number is multiple of four. —[[Special:Contributions/172.69.33.35|172.69.33.35]] 17:37, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
This is easy! Don't factor it - just subtract 4 repeatedly. If you end up at 0, it's divisible. If you end up at 1, 2, or 3, it's not. -- 17:55, 29 December 2017 (UTC){{unsigned ip|172.68.58.167}}&lt;br /&gt;
&lt;br /&gt;
This ''is'' easy! Sums of numbers that have 4 as a factor are all divisible by four. (I'll leave the proof of that as an exercise for the reader, but it's really trivial, though possibly non-intuitive.) This means that one can take a number apart and check the individual pieces. Now, any number that's a multiple of 100 is divisible by four (10 * 10 = 5² * 2²,) so one can essentially cut away the higher digits of a number, as they do not influence its divisibility with regard to 4. Now look at the first of the remaining digits. If that's odd, add 2 to the last digit. If the last digit is now divisible by four, the original number is divisble by four. [[User:Tibfulv|Tibfulv]] ([[User talk:Tibfulv|talk]]) 00:38, 30 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
The calculation of Christmas is trivial{{Citation needed}} it's December 25th. Where as the calculation of Easter is complex ([https://en.wikipedia.org/wiki/Computus]). [[Special:Contributions/172.68.133.18|172.68.133.18]] 18:03, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
Calulsting the date of Christmas is actually non-trivial. It depends on your location. For example if you are in the US it's in December. If you are in Russia it's in January. If you are in Ukraine it's sortof both but not really. And if you are in Crimea, well, see one of the 2 previous sentences. --[[Special:Contributions/172.68.238.172|172.68.238.172]] 15:22, 30 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
;Title text explanation mis-read&lt;br /&gt;
Explanation of title text is incorrect: &amp;quot;The title text refers to calculating the date of Christmas; again, this is a trivial exercise, because Christmas is always December 25.&amp;quot; Title text states 'day of Christmas', not 'date...'. The day changes each year and so does require calculation. {{unsigned ip|162.158.111.73}}&lt;br /&gt;
&lt;br /&gt;
Oops, my bad. Fixed. [[User:FlyingPiMonster|FlyingPiMonster]] ([[User talk:FlyingPiMonster|talk]]) 18:08, 29 December 2017 (UTC)&lt;br /&gt;
* I think you have it backwards. The title text is a reference to calculating the day (as in &amp;quot;date&amp;quot;, not &amp;quot;day of week&amp;quot;) of Easter. This is a non-trivial calculation (though one that modern computers can perform easily). On the other hand, the Christmas day is fixed. (There's no reason to believe that the joke was anything else.) - [[User:Mike Rosoft|Mike Rosoft]] ([[User talk:Mike Rosoft|talk]]) 19:13, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
I don't know who wrote the explanation, but...  Are they having a bad day? [[Special:Contributions/162.158.111.205|162.158.111.205]] 18:44, 29 December 2017 (UTC)&lt;br /&gt;
:That was vandalism. I did a revert. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:06, 29 December 2017 (UTC)&lt;br /&gt;
::Ah, no, I was asking because the explanation sounds so angry. [[Special:Contributions/141.101.104.17|141.101.104.17]] 22:48, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
:Also, Megan understands that checking if a number divisible by 2 is easy [[Special:Contributions/141.101.77.50|141.101.77.50]] 19:32, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
;Theory for possible explanation&lt;br /&gt;
Didn't want to edit this in because I'm not sure- but the motivation for this uncharacteristic lack of mathematical rigor could have to do with the current trend of people being dismissive of science being able to predict things. Something that seems pretty obvious is made to look like a chance event that nobody can really predict ahead of time. {{unsigned|Sirpent}}&lt;br /&gt;
&lt;br /&gt;
::This is easy! Don't factor it - just subtract 2000. Is 18 divisible by 4? If so, you're an idiot. {{unsigned ip| 172.68.143.156}}&lt;br /&gt;
&lt;br /&gt;
::The nonsense does look to me like a political discussion where one person uses &amp;quot;alternative facts&amp;quot;.  But in real life people get leap years &amp;quot;amusingly&amp;quot; wrong.  Computer system designers for instance... one software tool I used passed into the year 2000 working correctly, but then it broke 2 months later because it thought 2000 wasn't a Gregorian calendar leap year, I guess because every 4th year is but every 100th year isn't.  Every 400th year is, but, if the programmer just stopped at &amp;quot;every 4th is a leap year&amp;quot; then they'd have been fine until 2100.  Robert Carnegie rja.carnegie@excite.com [[Special:Contributions/141.101.105.102|141.101.105.102]] 22:06, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
The joke in this might be that it might take some time to brute-force the prime factorisation of 2018 with a calculator as it’s 2*1009. Same holds true for 2017 which is prime. Therefore on might come to the conclusion that factorisation is hard already at this scale. (flx) [[Special:Contributions/172.68.253.71|172.68.253.71]] 22:24, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
;Odd/even is another joke&lt;br /&gt;
Cueball: No, it's definitely not. Leap years are divisible by 4.&lt;br /&gt;
Megan: Right, and for odd numbers, that's easy.&lt;br /&gt;
Megan: But 2018 is even.&lt;br /&gt;
&lt;br /&gt;
She can see that finding out if a number is divisible by 2 is easy, but for dividing by 4 it's a &amp;quot;50/50 chance&amp;quot;, and really hard to calculate. IMHO the best joke in the comic but missing from the explanation. [[Special:Contributions/141.101.77.50|141.101.77.50]] 23:59, 29 December 2017 (UTC)&lt;br /&gt;
&lt;br /&gt;
I think it's interesting that 2018 only has two factors, 2 and 1009. Maybe a trivia?&lt;br /&gt;
[[Special:Contributions/162.158.238.107|162.158.238.107]] 17:40, 30 December 2017 (UTC)&lt;/div&gt;</summary>
		<author><name>162.158.238.107</name></author>	</entry>

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