explain xkcd - User contributions [en]

2721: Euler Diagrams

2023-01-07T18:36:18Z

Mcherm:

{{comic
| number = 2721
| date = January 6, 2023
| title = Euler Diagrams
| image = euler_diagrams_2x.png
| imagesize = 370x409px
| noexpand = true
| titletext = Things Leonhard Euler created ( most of math ( overlapping circle diagrams ) a cricket bowling machine ) Things John Venn created
}}

==Explanation==
{{incomplete|Created by THE EULER BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

In this comic, [[Cueball]] is showing an off-screen person a {{w|Venn diagram}} he made about something. The off-screen person then informs Cueball that it is in fact an {{W|Euler diagram}}, not a Venn diagram (which is, in a sense, true!). Cueball then proceeds to complain that {{w|List of things named after Leonhard Euler|many things}} are named for {{w|Leonhard Euler}} (specifically {{w|Euler's constant}} and {{w|Euler's function}}) and wants to call the diagram a Venn diagram to give {{w|John Venn}} more credit. His off-screen friend refuses, and mockingly states that numbers are now called "Euler letters", which is currently false.{{citation needed}} Modern {{w|Arabic numerals}} predate Euler by at least a century, and other numerals existed before that.

A Venn diagram is "a widely used diagram style that shows the logical relation between sets". It shows overlap of items in different categories (sets) by using overlapping circles (or other shapes) to stand in for categories. If an item is within a certain circle, it is in the category the circle represents. So in a Venn diagram of "animals" and "fuzzy things", "cat" would be in the overlap between both circles, "frog" would be inside only "animals", and "kiwifruit" would only be in "fuzzy things". "Crystals" would be outside both
circles.

{{w|John Venn}} was not the first to invent the idea of drawing regions whose overlap shows the intersection of sets -- that was popularized by Euler (although he may not have been the first to do it) and was known as {{w|Euler Diagram}}s. Venn's innovation, roughly 100 years later, was to consistently draw ALL intersections of sets, even those intersections that had no members. In a Venn diagram, all 'circles' must overlap with all other circles, even if there are no items in the overlap. This is easy enough for 2 and 3 sets, but as the number of sets increases the diagrams can get [https://www.newscientist.com/article/dn22159-logic-blooms-with-new-11-set-venn-diagram/ rather complicated] ([https://raw.githubusercontent.com/wiki/tctianchi/pyvenn/venn6.png Example]), and the sets can start looking very non-circular. An Euler diagram is required to depict only the non-empty combinations/sets, and therefore does not have this constraint. The diagram in the comic does not have any overlap between the left and right sections so, while it is an Euler diagram, it is not a Venn diagram.

[[File:Euler Diagrams title text.png|300px|thumb|right|The title text as a Venn (and, simultaneously, an Euler) diagram]]
The title text is an example of a "written" Venn diagram, with Leonhard Euler creating "most of math", John Venn creating a {{w|cricket}} bowling machine, and both of them having created overlapping circle diagrams.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}} 
:[Cueball is standing in front of a whiteboard, evidently giving a talk. The title "Venn Diagram of" is visible, along with three partially overlapping circles and various illegible text.]
:Offscreen voice: Actually, that's an ''Euler'' diagram, because-
:Cueball (palms upraised pleadingly): Come '''''onnnn.'''''
:Cueball: '''''Everything''''' is named after Euler. Euler's constant, Euler's function.
:Cueball: Can't we let John Venn have this?
:Offscreen voice: No.
:Offscreen voice: Also, numbers are now "Euler letters."

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Math]]
[[Category:Euler diagrams]]
[[Category:Venn diagrams]]
[[Category:Sport]]

2625: Field Topology

2022-05-29T12:35:06Z

Mcherm: Point out that the whole thing is a pun on the title "Field Topology".

{{comic
| number = 2625
| date = May 27, 2022
| title = Field Topology
| image = field_topology.png
| titletext = The combination croquet set/10-lane pool can also be used for some varieties of foosball and Skee-Ball.
}}

==Explanation==
{{incomplete|Created by SOMEBODY HOMEOMORPHIC TO YOUR DOG - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

Field Topology is [https://encyclopediaofmath.org/wiki/Topological_field a subject in mathematics], but in this comic, Randall has taken the term literally. The comic strip depicts a situation where the common practice of multi-use athletic facilities has been organized by the "topology department" and constructed to be shared by all sports whose normal playing fields are {{w|topology|topologically equivalent}}. (Not to be confused with {{w|Field (mathematics)|mathematical fields}}, or the {{w|Fields Medal}} prize -- although successfully {{w|Straightedge and compass construction|constructing}} these fields might lead to medals of one kind or another being granted).

In topology, shapes which can be smoothly deformed into one another without adding or removing holes are considered to be "equivalent". Note that a topological hole is an area of the nominal space (or area, or other manifold) through which nothing restricted to this topology can pass. In describing a real-world archway, for example, this would be where the material of the arch is, not the actual 'hole' passing ''through'' the constructed arch, which is the path that one indeed may (or must!) pass through to get from one region of the layout to another. A loop is a path across the allowable territory of a topology (or a viable circuit to make through the world it describes) that end up where it started. If a loop cannot be tightened (ultimately adjusted to take a shorter path) down to a single point, then it must be wrapped around at least one 'topological hole' (i.e. through a physical one), and you have separately unique paths (or points, i.e. on different disconnected topologies) where you cannot adjust one loop to take the route of another, without severing a looped-path and reconnecting it.

{{w|Baseball}}, and {{w|tetherball}} are played on fields without any holes that the ball or players can completely pass through, so they are ({{w|Group (mathematics)|grouped}}) (physically and mathmatically) into one continuous field without holes. The goals on a {{w|soccer}} field presumably do not create holes because the goalposts and crossbar are connected to the field by the net, so the goals and field are topologically equivalent to a smooth disc. Any path taken into and out of the goal (any number of times) is topologically equivalent to one that does not go into this pocket of space at all.

{{w|Volleyball}} and {{w|badminton}} are played on a court through the center of which passes a net suspended from poles, and the {{w|high jump}} has a bar that contestants jump over. The space bounded by the bottom of the net (or bar), the supporting poles, and the ground can be considered to be a hole, a path over and under the net/bar cannot be simplified to one that does not, so their fields all have one "hole".

A basketball court has two physical pathable holes, the nets. Parallel bars can be thought of as two rectangles and thus as two topographical "holes". Both have opportunities to path through either (or both) structures, and so the material of the structures define a hole in the topological abstract of the playing 'surface'. The inclusion of an American football field is perplexing. Commonly, an American football field uses a "Y" shaped upright, making the field topologically equivalent to a plane. However, at lower levels of play (primary and secondary schools), sometimes an "H" shaped upright is used, which creates a topological hole under the crossbar at both ends of the field. The comic might instead refer to Gaelic football or Rugby, both of which use "H" shaped goals and are called "football" in certain contexts. The open-top of the goals is physically an analogue of soccer goals, but as a closed frame of the bottom does not have a net (except in Gaelic Football) these demonstrate topological loops. An alternate explanation would consider passage between the sidebars but at any ''indefinite'' distance above the crossbar (however supported above the ground) to be a special space for scoring purposes, and the topological hole would relate to these limits, held above the ground in a manner not dissimilar to the basketball hoop – although this interpretation is incompatible with 'abstracting away' the special nature of the soccer goal-mouth in its own representation. A third possibility is that the posts of the uprights themselves create small unplayable zones which function as holes in the playing surface.

The lane dividers in a swimming pool create bounded holes on the 'playing surface' equivalent to the number of lanes. And each hoop in croquet is a hole with one edge bounded by the playing surface. Similarly, as mentioned in the title text, this configuration is also {{w|homeomorphism|homeomorphic}} to a {{w|foosball}} table (with each rod sustaining the player figures above the table defining a hole) or a {{w|Skee-Ball}} lane (which is even more straightforward, as it is just a plane with several holes in which to throw balls).

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

A row of four signs, each held up by two posts, followed by a row of four roughly lozange shapes, one for each sign. The signs and lozange shapes are shaded as if three-dimensional objects, all being flattish with a small third dimension. The four oblongs are presented at an oblique angle, as if they are in "front" of the signs extending towards the viewer. All but the first oblong have various numbers of holes "through" them.

zero holes: "Baseball. Soccer. Tetherball."

one hole: "Volleyball. Badminton. High jump."

two holes: Basketball. Football. Parallel bars."

nine holes: "Olympic swimming. Croquet."

Image caption: "No one ever wants to use the topology department's athletic fields."

{{comic discussion}}
[[Category:Math]]
[[Category:Sport]]

2520: Symbols

2021-09-24T22:45:18Z

Mcherm: Added a link to illustrate particle beams being "even more damaging"

{{comic
| number = 2520
| date = September 24, 2021
| title = Symbols
| image = symbols.png
| titletext = "röntgen" and "rem" are 20th-century physics terms that mean "no trespassing."
}}

==Explanation==
{{incomplete|Created by an INTERNET ARGUMENT - Please change this comment when editing this page. Do NOT delete this tag too soon. Bare-bones explanation is in, but needs much more detail.}}

This comic refers to elements of (mostly mathematical or engineering) notation commonly used in various fields of math and science. Each piece of notation is presented as "symbolizing" not what it specifically means, but a typical ''context'' in which it might be encountered. Many of the individual descriptions sounds look like verbiage that might be found on informational or warnings signs or placards, although typically with a silly edge.

*d/dx: An undergrad is working very hard
d/dx is the symbol for a single-variable {{w|Derivative|derivative}}. This is a mathematical operation that, while difficult, is one of the most basic operations in calculus and consequently well within the reach of an undergraduate student, particularly in science. Thus, an equation with this operation would be one that would cause an undergraduate student to work very hard.

*∂/∂x: A grad student is working very hard
The replacement of the standard "d" letters with the curly letters "∂" denotes the partial derivative, which generalizes the ordinary derivative to multi-variable calculus. Problems with partial derivatives, especially partial differential equations, can be extremely challenging—appropriate for hard graduate-level work.

*ħ: Oh wow, this is apparently a quantum thing
ħ (pronounced "h-bar") is a symbol used for (the reduced) Planck's constant, a universal, fundamental constant in quantum physics. ħ is equal to the energy of a photon divided by its frequency, and angular momentum in quantum mechanical systems is measured in quantized integer or half-integer units of ħ.

*Re: Someone needs to do a lot of tedious numerical work; hopefully it's not you
The Reynolds number (which is actually usually denoted by "Re," not "Re" as it appears in the comic) is the most important dimensionless group in fluid mechanics. Named for Osborne Reynolds, Re characterizes the relative sizes of inertial and viscous effects in a moving fluid. Large values of Re are indicative of turbulent flow, which cannot usually be solved for analytically, and so numerical modelling is necessary. Accurate numerical studies of high-Reynolds-number flows are notoriously difficult to create and program.

*(Ta4 – Tb4): You are at risk of skin burns
The Stefan-Boltzmann law says that a perfectly absorbing ("black body") source emits electromagnetic radiation with a power per unit area of σT4, where σ is a known constant and T is the absolute temperature. The quantity (Ta4 – Tb4) thus appears in any calculation of purely radiative energy transfer between two bodies, one at temperature Ta and the other at Tb. When radiative transfer is large enough to be the most important form of heat interchange, it is normally also large enough to sear the skin with thermal or ultraviolet burns.

*NA: You are probably about to make an incredibly dangerous arithmetic error
NA, or Avogadro's number, is the number of molecules in a mole of a substance—roughly the number of protons and neutrons in 1 gram of matter. This is an enormous number, approximately 6.02 × 1023. Adding up molecular weights and converting between grams and moles of several substances is a lot of arithmetic on a scale where intuition won't help you catch mistakes. Working with NA, it is easy to make errors of one or more factors of ten without noticing. If this kind of error is made in the calculation of the stoichiometrically correct amount of a reagent in a chemical reaction, it is possible to accidentally create dangerous amounts of unwanted chemical products.

*µm: Careful, that equipment is expensive
Micrometers are a very small unit of distance. Any equipment that is operating in these units will be incredibly finely calibrated and thus very expensive.

*mK: Careful, that equipment is very expensive
Millikelvin temperatures are very cold, barely above absolute zero, suggesting sensitive experiments probing quantum mechanical behavior that would likely only exist in an advanced laboratory. Any equipment that works down a mK temperatures is likely to be very expensive.

*nm: Don't shine that in your eye
Nanometers are most frequently seen in the listed wavelengths for lasers. Pointing a visible or infrared laser at someone's eye is notoriously dangerous; the tightly-focused coherent light can cause permanent damage very quickly.

*eV: Definitely don't shine that in your eye
Electron volt energies are typical of moderate-energy particle beams, produced by accelerating electrons (or protons) over macroscopic voltages. These particle beams can be [https://en.wikipedia.org/wiki/Anatoli_Bugorski even more damaging] to soft tissues than optical-wavelength lasers.

*mSv: You are about to get into an Internet argument
The millisievert is a unit of radiation dose absorbed. It is actuality a very small dosage, but the joke refers to Internet trolls debating the effects of low-dose radiation sources, such as 5G wireless networks. Randall's comment may also be referring to [https://xkcd.com/radiation/ this chart].

*mg/kg: Go wash your hands
This unit measures the dose of a drug or other chemical in milligrams per kilogram of body mass. If the appropriate dose - or worse, the lethal dose - is measured in mg/kg (parts per million), then the substance may be quite toxic.

*µg/kg: Go get in the chemical shower
A unit 1000 times smaller than mg/kg. If a dosage is measured in micrograms per kilogram (parts per billion), it is probably causing chemical rather than biological reactions.

*π or τ: Whatever answer you get will be wrong by a factor of exactly two
π is defined as the ratio of a circle's circumference to its diameter, while τ is defined as 2π (the ratio of the circumference to the radius). π has been used as the primary constant for describing the circumference and area of circles for millennia, but proponents of τ point out that τ is actually more natural in most constants, since it makes working in radians more straightforward. The joke here is that whichever constant you use, it will probably be the wrong one (off by a factor of two, one way or the other) for the formula you are trying to use.

The title text refers to two non-SI units of radiation measurement. In the mid-20th century when they were in use, the dangers of radiation weren't as well understood as today, so an area with radiation that was noteworthy back then is probably dangerous, hence the no trespassing part.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

;d/dx
:An undergrad is working very hard
;∂/∂x
:A grad student is working very hard
;ħ
:Oh wow, this is apparently a quantum thing
;Re
:Someone needs to do a lot of tedious numerical work; hopefully it's not you
;(Ta4 - Tb4)
:You are at risk of skin burns
;NA
:You are probably about to make an incredibly dangerous arithmetic error
;µm
:Careful, that equipment is expensive
;mK
:Careful, that equipment is very expensive
;nm
:Don't shine that in your eye
;eV
:Definitely don't shine that in your eye
;mSv
:You are about to get into an internet argument
;mg/kg
:Go wash your hands
;µg/kg
:Go get in the chemical shower
;π or τ
:Whatever answer you get will be wrong by a factor of exactly two

{{comic discussion}}

2149: Alternate Histories

2021-05-06T20:36:27Z

Mcherm: Punctuation.

{{comic
| number = 2149
| date = May 13, 2019
| title = Alternate Histories
| image = alternate_histories.png
| titletext = "So their universe wouldn't have the iconic photo of a screaming Truman being hoisted aloft by the newspaper-printing machinery..."
}}

==Explanation==
Alternate histories are a common device in speculative fiction. One of the most common (even cliche) uses of alternate history is to posit a world in which the {{w|Hypothetical Axis victory in World War II|Axis Powers achieved victory in World War II}}. This is presumably so compelling because it was a relatively recent event in which a series of relatively minor changes could have altered world history in major ways. One of the standard literary works along this line is Philip K. Dick's ''{{W|The Man in the High Castle}}'', where the world is split into spheres of influence controlled by the {{W|Empire of Japan}} and {{W|Nazi Germany}}. This novel has been developed into a {{w|The Man in the High Castle (TV series)|popular TV series}} of the same name on Amazon Prime.

At one point, ''The Man in the High Castle'' discusses the fiction of their own world, which includes their own alternate histories in which the Allies had won the war instead. ''The Grasshopper Lies Heavy'' is one such novel. Because these stories are speculative, they don't entirely match the 'real' history of our world, differing in key ways. This results in an "alternate-alternate" history where the Allies won World War II, but the details still differ rather significantly than the history of World War II in our reality -- most notably, ''The Grasshopper Lies Heavy'' depicts a post-World War II world defined by a {{w|Cold War}} between the United States and the British Empire, rather than one between the United States and Soviet Union. In one sense, this functions as a meta-critique of the very concept of alternate histories, highlighting the reality that we can never know the details of what would have happened if history had gone differently.

In this comic, Megan and Cueball discuss this fictional device. Then in typical xkcd fashion, things start to get exaggerated to ridiculous proportions: Megan points out that, if characters in our stories have their own fiction, then the characters in their stories presumably have their own body of fiction, and so on, creating a recursive loop. If each alternate history contains its own alternate history, presumably each iteration would deviate more and more from our own reality, because each would be speculation based on increasing layers of speculation. Eventually (by the 500th iteration) the history would differ so wildly from our own as to be completely absurd to us, with very few elements being even recognizable.

The 500th iteration timeline apparently includes hovercraft and cybernetic horses. {{w|Hovercraft}} are a real technology which does have military applications as landing craft, but their use in actual warfare has been limited. Cybernetic horses do not exist in our timeline{{Citation needed}}, but {{w|Boston Dynamics}} is getting close. In our timeline, Scotland is part of the United Kingdom, and would likely not develop military technology independently. New Jersey is a state in the United States and Madagascar was controlled by France during World War II; neither of these would normally be able to pursue an independent foreign policy that would have allowed them to join alliances and fight wars unless their parent governments also did. Belgium was occupied by the Axis Powers early in the war. These three regions developing a alliance and fighting against Canada (which was also an Allied power) would require a highly unlikely combination of events. How this war would be affected by the lack of Scottish hovercraft is unclear. This scenario also apparently contains a theocracy of some variety in Missouri, which (remarkably!) is vaguely plausible.

Interestingly, even within the bounds of the exceedingly meta-fiction, it is bordering on impossible for the scenario to come into existence; the reason for this is that while the ending would become evermore bizarre, the actual events will only be able to vary so much, as they are based on predetermined scenarios that occur before the changes take place. Unless at least two wars are being modified, or the events are based on a later occurrence, (basically the two are discussing something different entirely, albeit still a historical scenario) the idea of so many implausible things occurring is unlikely no matter what the circumstances, unless they all happened over the course of the war. Of course, it's possible several of those 500 iterations involve BAD alternate histories fiction. Or possibly fiction based on history which was deliberately falsified.

It's unlikely, but it's worth noting that "cybernetic horses" could be a reference to {{w|cyber force}}s, since in [[1418: Horse]] that substitution is suggested.

{{W|Laura Ingalls Wilder}} was an American author, best known for her ''{{W|Little House on the Prairie}}'' series. In the 500th iteration timeline, she apparently became "God-Emperor of Missouri", despite not being known as a political figure in our timeline. {{W|Harry S Truman}}, in our timeline, became 33rd President of the United States, following the death of Franklin Delano Roosevelt. In the 500th iteration timeline, Truman apparently died in an accident involving pajamas and a printing press while still a senator (presumably a U.S. senator, since in our reality he was serving in the United States Senate prior to being nominated as Roosevelt's vice president in 1944). He apparently remained a significant enough figure for 500th-iteration Megan to speculate that he would have become God-Emperor of Missouri if he'd survived.

The title text continues the discussion about Truman, mentioning a photograph of Truman screaming in horror as he is hoisted by newspaper-printing machinery. This plays off {{w|Dewey Defeats Truman|a famous photograph from our world}} where Truman is the one hoisting up a copy of the ''Chicago Tribune'' in triumph, as said newspaper erroneously claimed he was defeated in the {{w|1948 United States presidential election}} by {{w|Thomas Dewey}}.

==Transcript==
:[Megan and Cueball are walking together]
:Megan: In alternate history stories where the allies lost WWII, sometimes they have their own fiction with the premise "what if the allies had ''won''?" which differs from our world since they'd be speculating and wouldn't predict everything.
:Cueball: Yeah, I think they do that in ''Man in the High Castle''.

:[Megan and Cueball continue walking together]
:Megan: But within ''those'' stories, they should have "what if the allies had ''lost''?" fiction which is even ''more'' removed from our world.
:Cueball: Uh oh.
:Megan: So how deep does it go?

:[Cueball and Megan, wearing tall black ball-topped hats and large bracelets and presumably from some alternate history, are walking together. There is a caption in a frame over the top of the panel]
:500 levels in:
:Megan: In my alternate history, Scotland never develops hovercraft, so Canada's cybernetic horses ''defeat'' the Belgium-Madagascar-New Jersey alliance.
:Cueball: Wow!

:[Alternate history Cueball and Megan continue walking together]
:Cueball: Then who becomes God-Emperor of Missouri, if not Laura Ingalls Wilder?
:Megan: Senator Truman!
:Cueball: He survives the accident?!
:Megan: Yeah, the pajama craze never catches on, so he's wearing normal clothes when he walks by the printing press...

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Characters with Hats]]
[[Category:Fiction]]
[[Category:Comics featuring real people]]

{{comic discussion}}

187: The Familiar

2020-06-09T02:30:02Z

Mcherm: /* Explanation */

{{comic
| number = 187
| date = November 22, 2006
| title = The Familiar
| image = the familiar.png
| titletext = When I say we should do something sometime, I'm secretly hoping you'll say 'Why not now?'
}}

==Explanation==
[[Cueball|Cueball's]] friend asks him to go with him to view the sunrise over the ocean. Cueball refuses by giving a list of excuses, including the statement that "rationalizing the familiar is easy." This statement is amusing, because Cueball acknowledges the fact that he is making excuses and seems to refuse going out on the basis that rationalizing going to see the sunrise would require much more effort. This criticizes some people's tendency of not trying new things or going out with friends, even though one would likely get more fulfillment by doing these things. It may well be implied that the friend doing the inviting has left to view the sunrise, leaving Cueball behind since he wasn't willing to engage in an activity.

The computer with the egg-shaped profile looks like an iMac G3, sold from 1998 until 2003. It seems that rationalizing the familiar has made Cueball resistant to upgrading his computer long beyond its obsolescence date.

The title text indicates [[Randall|Randall's]] frustration with this mentality and his hope that when he wants to make plans with someone, they are just as eager.

==Transcript==
:[A guy is standing behind his friend who sits at a computer. Both look like Cueball.]
:Guy: Let's go see sunrise over the ocean.
:[The friend turns and replies:]
:Friend: That's a long drive, it's cold, I'm tired, and rationalizing the familiar is easy.
:[The guy leaves, and in the next two frames, the friend remains at his computer alone.]

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Multiple Cueballs]]

Talk:383: Helping

2020-05-02T13:32:13Z

Mcherm: Just a note on interpretation

Most depressing XKCD ever? [[Special:Contributions/71.201.53.130|71.201.53.130]] 14:24, 22 August 2013 (UTC)
:Every time when I see this comic I'm close before some tear drops running out of my eyes ;( --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 21:42, 9 December 2013 (UTC)

Waitwaitwait. So the guy was in the building all along, witnessing the suicide/self-harm, and he failed to stop a woman from apparently successfully knocking herself out? 16:19, 24 May 2014 (UTC) {{unsigned ip|141.101.88.205}}

I thought Cueball was choking her![[Special:Contributions/108.162.238.169|108.162.238.169]]

I thought maybe it was about Randall's wife. Just like some of the comics feature her implicitly, I thought maybe this one did. {{unsigned ip|108.162.216.20}}

I think the explanation is a bit off. Sometimes getting someone into a hospital is helping. I've had to call 911 to get friends help. Things usually got bad for a while after that. [[Special:Contributions/108.162.216.124|108.162.216.124]] 21:46, 26 April 2015 (UTC)

The first time I saw this one, it was some 2 or 3 days after I had to call the police for a friend who was attempting suicide. It hit way, way too close to home, to the point where I wanted to cry. I ended up just getting up right then and going for a long walk in the woods to clear my head. 7:24, 2 July 2015 (UTC) {{unsigned ip|173.59.1.79}}

To 108.162.216.20, he married in 2011... this comic was made in 2008. Unfortunately, we may never know who he is referring to. {{unsigned ip|141.101.84.114}}

Am I the only one who feels that the point is he tried to talk to someone to cheer them up, but the woman was so distraught by what cueball said, it lead to self harm? {{unsigned ip|107.136.89.38}}
:I think the text is rather confusing: If you take responsibility for somebody's sadness, as in "I'm sorry. This was my fault." it may help. But saying "I made you feel this good" seems like bragging and does not help. But she was apparently already sad, so, yeah, kinda confused. Isn't that what explainxkcd is for? [[User:Jacky720|That's right, Jacky720 just signed this]] ([[User talk:Jacky720|talk]] | [[Special:Contributions/Jacky720|contribs]]) 22:52, 24 June 2017 (UTC)

When you care for someone, especially a significant other, your natural instinct as a decent human being is to provide help and support when they are in distress or upset. But with issues like depression, tendencies toward self-harm, or even general anxiety, your attempt to help provides no benefit or much more likely makes things worse. You being so close to that person makes it that much harder for them to be helped by you, and it often isn't your place to assume the role of therapist or counselor no matter how much you want to. No matter how much you think that person should be happy, you can't assume responsibility for it and no amount of convincing or reassuring is going to help that. When things get really bad, professional medical help and distance are the only thing that will keep that person safe. I cry when I read this. I've sat and held the hand of a close friend while he was handcuffed by campus police for his own safety and was escorted to a hospital for treatment. It takes a long time to heal that divide - and its the most frustrating thing in the world to know the best thing you can do is step away for a while. If you ever feel the need to comfort a spouse, a child, a friend who is so overwhelmed with existence that they aren't sure they want to live anymore, you'll understand this panel. {{unsigned ip|172.68.141.172}}

First time I read this comic, I didnt think much of it.
Rereading it years later, after I lived with a loved one struggling with depression, made me cry so much. It is exactly what I feel.

Does anyone else feel like the comic is actually saying that sometimes, bad things will happen no matter whether or not you try to help?

Okay, this almost happened to my classmate's friend like around 3 month plus ago, she was struggling with a case of suicide due to depression. When I see this, it reminds me of her friend a lot, and I wonder how is her friend doing. This is actually quite a tear-jerker if you are having a depression or your loved ones having it. Please, get some form of help if you need it...Boeing-787lover 10:08, 26 June 2018 (UTC)

A few of the people writing comments here seem to have concluded that the Cueball somehow made things more difficult for Megan. I don't see any indication of that. Just that he attempted to help or comfort her and that it wasn't sufficient. [[User:Mcherm|Mcherm]] ([[User talk:Mcherm|talk]]) 13:32, 2 May 2020 (UTC)