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		<title>explain xkcd - User contributions [en]</title>
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		<updated>2026-06-24T22:03:48Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2945:_Broken_Model&amp;diff=344306</id>
		<title>Talk:2945: Broken Model</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2945:_Broken_Model&amp;diff=344306"/>
				<updated>2024-06-13T22:07:26Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.62.217: &lt;/p&gt;
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&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;
If only Randall had included a cabbage somewhere... [[Special:Contributions/172.68.64.241|172.68.64.241]] 05:03, 13 June 2024 (UTC)&lt;br /&gt;
:He included grass... --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 06:50, 13 June 2024 (UTC)&lt;br /&gt;
:The cabbage would consume nothing &amp;amp; nothing would consume the cabbage; it's a null value, so the mathematician left it out.   &lt;br /&gt;
:[[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 16:55, 13 June 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
This &amp;quot;terrifying alternate universe&amp;quot; thing goes all the way back to the 5th century before the Common Era:&lt;br /&gt;
&lt;br /&gt;
The lion shall lie down with the lamb, and they shall eat grass.&lt;br /&gt;
Alas for the lion! He cannot eat grass, he shall be no more, unless he become a lamb.&lt;br /&gt;
Alas for the grass! There are too many lambs, it cannot grow, it shall be no more, unless it become thorns.&lt;br /&gt;
Alas for the lambs! They cannot eat thorns, they shall be no more, unless they eat each other - &lt;br /&gt;
yea, unless some become lions, and they eat enough lambs so that the grass may grow again.&lt;br /&gt;
&lt;br /&gt;
Ergo, Heaven is Hell. QED. [[Special:Contributions/172.68.22.177|172.68.22.177]] 06:09, 13 June 2024 (UTC)&lt;br /&gt;
:Yep predators are important, but only if they are the 20 and the prey are the 400. Else it is extermination for the prey. And if the predators only eat those kinds of animals also the end for them. Luckily the rabbits could eat grass. But what should the grass eat now there are no more foxes? ;-) --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 06:50, 13 June 2024 (UTC)&lt;br /&gt;
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I wonder if the term ''hell'' is a reference to the paper [https://www.researchgate.net/publication/24310043_A_slow_life_in_hell_or_a_fast_life_in_heaven_Demographic_analyses_of_contrasting_roe_deer_populations A slow life in hell or a fast life in heaven: Demographic analyses of contrasting roe deer populations] (2009). I couldn't find any earlier mention in this context. [[Special:Contributions/172.71.130.199|172.71.130.199]] 07:51, 13 June 2024 (UTC)&lt;br /&gt;
:It's probably a reference to the realm mentioned in most religions where eternal punishment is dished out to uncool individuals based on their bad deeds. &amp;quot;Hell&amp;quot; is the reference here, not an article on deer populations, lol. [[User:Psychoticpotato|Psychoticpotato]] ([[User talk:Psychoticpotato|talk]]) 17:58, 13 June 2024 (UTC)&lt;br /&gt;
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Anyone else with a sudden urge of writing a Zootopia fanfic (&amp;quot;No, Judy, NOOOOO!&amp;quot;)? (Oh yes, the relevant pic exists. This is teh Internet.) [[Special:Contributions/198.41.242.174|198.41.242.174]] 08:44, 13 June 2024 (UTC)&lt;br /&gt;
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That last paragraph is completely incomprehensible at time of writing. --[[User:Mushrooms|Mushrooms]] ([[User talk:Mushrooms|talk]]) 11:37, 13 June 2024 (UTC)&lt;br /&gt;
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Apparently, AI doesn't have a problem with redundant content - for example, the double mention of &amp;quot;Fox Hell&amp;quot; in the Title Text with two separate paragraphs.  The AI generator also seems intent on commenting excessively on typical xkcd humor patterns.  I feel like some of this extra AI content needs to be trimmed down just a bit, as it doesn't add value and just makes it look like a school essay instead of a human-readable explanation. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 16:44, 13 June 2024 (UTC)&lt;br /&gt;
:Agreed.   &lt;br /&gt;
:[[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 16:58, 13 June 2024 (UTC)&lt;br /&gt;
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It's rather obvious LLM was used here, especially the part where it only mentions the teacher saying &amp;quot;If this were an ecology class, I would have to fix that.&amp;quot; [[Special:Contributions/162.158.146.32|162.158.146.32]]&lt;br /&gt;
&lt;br /&gt;
Are AI-generated additions to the explanations allowed here? I immediately came here after reading the &amp;quot;explanation&amp;quot; and noticing how redundant and inaccurate it was and was hoping it would be removed. [[Special:Contributions/162.158.62.217|162.158.62.217]] 22:07, 13 June 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
== Carnivorous grass? ==&lt;br /&gt;
&lt;br /&gt;
I feel like this grass exists, even though I've never seen it named. Looks like grass, but puts out thorns tough enough to penetrate bike tires, &amp;amp; can sometimes be found as a patch growing extra thick around a snared animal carcass?&lt;br /&gt;
&lt;br /&gt;
: A quick search suggests that &amp;quot;carnivorous grass&amp;quot; with features like this is a trope in world-building games. However, you may be thinking of this {{w|Puya chilensis|real-world South American bromeliad}}. [[Special:Contributions/172.71.150.128|172.71.150.128]] 17:45, 13 June 2024 (UTC)&lt;br /&gt;
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Couldn't fungi be classified as carnivorous &amp;quot;grass&amp;quot;? [[User:Psychoticpotato|Psychoticpotato]] ([[User talk:Psychoticpotato|talk]]) 18:00, 13 June 2024 (UTC)&lt;br /&gt;
: I would say it would be stretch considering fungi is neither grass nor carnivorous. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 21:34, 13 June 2024 (UTC)&lt;br /&gt;
::I mean, it can &amp;quot;chew&amp;quot; (decompose) stuff by growing on it. Aren't fungi plants? What does their gene tree look like? [[User:Psychoticpotato|Psychoticpotato]] ([[User talk:Psychoticpotato|talk]]) 21:38, 13 June 2024 (UTC)&lt;/div&gt;</summary>
		<author><name>162.158.62.217</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2702:_What_If_2_Gift_Guide&amp;diff=299749</id>
		<title>2702: What If 2 Gift Guide</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2702:_What_If_2_Gift_Guide&amp;diff=299749"/>
				<updated>2022-11-24T05:08:27Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.62.217: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2702&lt;br /&gt;
| date      = November 23, 2022&lt;br /&gt;
| title     = What If 2 Gift Guide&lt;br /&gt;
| image     = what_if_2_gift_guide_2x.png&lt;br /&gt;
| imagesize = 500x878px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = BABIES OR LITERATURE BUT NOT BOTH: Baby shoes&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created at STEPHEN KING’S DESK - Please change this comment when editing this page. Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|+ &lt;br /&gt;
|-&lt;br /&gt;
! Interest !! Gift Idea !! Explanation&lt;br /&gt;
|-&lt;br /&gt;
| Engineering || The platinum cylinder formerly used to identify the kilogram || This is an object of historical relevance of which only six exist, making it a very expensive or illegal gift.&lt;br /&gt;
|-&lt;br /&gt;
| Biology     || The genomes of the scientists who headed the human genome project || &lt;br /&gt;
|-&lt;br /&gt;
| Physics     || A beam of neutrinos delivered through the earth by the LHC || [https://en.wikipedia.org/wiki/Neutrino Neutrinos] interact very weakly with other particles, to the point that they almost always pass straight through matter completely unaffected. This means that particle accelerators can send neutrinos to any other point on Earth by aiming the particle beam into the ground, and the neutrinos pass straight through the Earth. This point is referenced in [https://what-if.xkcd.com/73/ What If? 73]. The low interactivity of neutrinos would also mean that the recipient would be unable to perceive their gift, making this a poor present for anyone except the small proportion of physics aficionados who already have a neutrino detector on-hand.&lt;br /&gt;
|-&lt;br /&gt;
| Animals     || Surprise wildlife encounter (gift-wrapped box with a bobcat inside) || This is a reference to [https://bobcatinabox.com/ Bobcat in a Box], which has been referenced in previous comics. This gift would place the recipient in a perilous situation, and, although definitely a wildlife encounter, is not a good gift{{Citation needed}}.&lt;br /&gt;
|-&lt;br /&gt;
| Law         || A vacation to that area of Idaho where you can commit crimes with impunity due to a court district boundary error || This refers to the [https://en.wikipedia.org/wiki/Zone_of_Death_(Yellowstone) &amp;quot;Zone of Death&amp;quot;], a 50-square-mile area of Yellowstone National Park that is in the physical boundaries of Idaho, but in the legal jurisdiction of Wyoming. Because a jury in the United States must be composed of residents of the same district ''and'' state in which the crime was committed, but no one lives in this small area of a National Park, anyone who committed a crime here could not possibly receive a trial, and thus could not legally be punished for said crime in any circumstance. This is an interesting legal loophole, but going to this area does not provide any more value than hearing about it, and could scare your law-enthusiast friend.&lt;br /&gt;
|-&lt;br /&gt;
| Chemistry   || A necklace of element samples whose symbols spell out the recipient's name (note: names like &amp;quot;Katherine&amp;quot; and &amp;quot;Brandon&amp;quot; may cause radiation accidents.) || Novelty necklaces are a common and innocuous gift, and using element symbols in place of the same letter is a common gimmick, such as in the title of Breaking Bad. However, making an object out of whatever element sample corresponds to someone's name could have unpredictable results - some elements in their pure form are too brittle or have too low a melting point for such an application, and some are unsafe. &amp;quot;Katherine&amp;quot; would be made from Potassium, Astatine (rare, '''radioactive''' and has a short half-life), Hydrogen (gaseous at room temperature), Erbium, Iodine (sublimes into a gas at room temperature), and Neon (gaseous at room temperature). &amp;quot;Brandon&amp;quot; would be made from Boron, Radium '''radioactive''', Neodymium, Oxygen (gaseous at room temperature), and Nitrogen (gaseous at room temperature).&lt;br /&gt;
|-&lt;br /&gt;
| Puzzles     || Two goats and a new car || This is a reference to the the [https://en.wikipedia.org/wiki/Monty_Hall_problem &amp;quot;Monty Hall problem&amp;quot;], in which a game show contestant can win only one of the three items. This gift places the recipient within a puzzle which is typically discussed hypothetically, rather than happening in real life. Although a new car is a ''great'' gift, goats are only useful to people with specific professions. &lt;br /&gt;
The problem that the recipient would have would likely be how to transport the two goats - it'd be difficult to fit both into a compact car at once, but one can't be left behind unattended.&lt;br /&gt;
|-&lt;br /&gt;
| Technology  || Cybiko® Wireless Handheld Computer For Teens (2000) || This device was referenced in [https://xkcd.com/2699/ one of last week's comics], so Randall seems to have a temporary fixation on it. While an interesting example of the history of communication technology and coming from a time when experimentation was common and standards were few, it isn't very useful now, because it is no longer supported, has a communication range of 100 meters (sending text messages via radio) and one can only use it to communicate with users of the same device. However, technology enthusiasts could find it interesting as a collectors' item, so by all means it is one of the most plausible gift ideas on this list.&lt;br /&gt;
|-&lt;br /&gt;
| Space       || Webb telescope personal photoshoot || The Webb telescope belongs to NASA, the ESA and the CSA, and is currently very far from Earth. It is designed to capture massive space objects in previously unseen detail, and thus doesn't operate well on the scale of an individual person, assuming that that is what photoshoot implies. These circumstances make it both an impossible and impractical gift. Furthermore, unless the recipient of the gift is able to travel a long way from Earth, Webb would have to point at the warm Earth and expose its optics to the Sun, permanently crippling the telescope.[https://webb.nasa.gov/content/about/faqs/faqLite.html This is forbidden by NASA.] On the other hand, a gift experience of being allowed to use a [https://www.dailymail.co.uk/sciencetech/article-10442913/James-Webb-Space-Telescope-seen-Earth-settles-orbit.html robotic telescope] to take your own snapshot of Webb in position might be an attractive gift to a space enthusiast! &lt;br /&gt;
|-&lt;br /&gt;
| Literature  || Stephen King's writing desk (he's still using it so you'll have to fight him) || Stephen King is an author lucky enough to have legendary status while still alive. The desk of an author that has died would become an object of historic significance and would likely be either kept for exhibition or auctioned by their respective estate, but as Stephen King still writes, his desk, while valuable, cannot be subjected to the same.&lt;br /&gt;
|-&lt;br /&gt;
| Philosophy  || Out-of-control trolley || This is another gift that places the recipient in the situations that they like discussing hypothetically. This refers to the trolley problem, which places stress on the person forced to make the decision, and exists to make them examine their morals. Facing someone with the hypothetical problem is already not a good gift, but forcing them to live through it in real life is a terrible gift{{Citation needed}}.&lt;br /&gt;
|-&lt;br /&gt;
| Psychology  || A nice gift with a note saying you don't expect anything in return || This is perhaps the most viable option on this list. This gift plays a psychological game on the recipient, reminding them of the nature of favors and bringing giving something into return into the question. This would cause them stress, making it a bad gift, but a psychologist would hopefully understand it to be a joke.&lt;br /&gt;
|-&lt;br /&gt;
| (Title text) BABIES OR LITERATURE BUT NOT BOTH|| Baby shoes || This is a reference to the six-word story [https://en.wikipedia.org/wiki/For_sale:_baby_shoes,_never_worn For sale: baby shoes, never worn] which is often attributed to Ernest Hemingway. Someone who likes babies could enjoy baby shoes in their own right. Someone interested in literature would see the reference to a famous work. But someone who understands the reference would possibly also be sad if they simultaneously actually liked babies (since the story implies the seller was expecting a baby but there was an accident).&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
''[https://xkcd.com/what-if-2/ What if? 2]'' is a book by [[Randall Munroe]], author of xkcd.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
What If? 2 Gift Guide&lt;br /&gt;
&lt;br /&gt;
What if? 2 makes a good gift for anyone who's into science, absurd ideas, or just the universe in general. To order, go to xkcd.com/whatif2, or just type &amp;quot;what if 2&amp;quot; into some random box on your device; it will probably work.&lt;br /&gt;
&lt;br /&gt;
Here are some other gift ideas for hard-to-shop-for science enthusiasts:&lt;br /&gt;
&lt;br /&gt;
Interest  -  Gift Idea&lt;br /&gt;
&lt;br /&gt;
Engineering  -  The platinum cylinder formerly used to define the kilogram&amp;lt;br/&amp;gt;&lt;br /&gt;
Biology  -  The genomes of the scientists who headed the human genome project&amp;lt;br/&amp;gt;&lt;br /&gt;
Physics  -  A beam of neutrinos delivered through the earth by the LHC&amp;lt;br/&amp;gt;&lt;br /&gt;
Animals  -  Surprise wildlife encounter (gift-wrapped box with a bobcat inside)&amp;lt;br/&amp;gt;&lt;br /&gt;
Law  -  A vacation to that area of Idaho where you can commit crimes with impunity due to a court district boundary error&amp;lt;br/&amp;gt;&lt;br /&gt;
Chemistry  -  A necklace of element samples whose symbols spell out the recipient's name (note: names like &amp;quot;Katherine&amp;quot; and &amp;quot;Brandon&amp;quot; may cause radiation accidents.)&amp;lt;br/&amp;gt;&lt;br /&gt;
Puzzles  -  Two goats and a new car&amp;lt;br/&amp;gt;&lt;br /&gt;
Technology  -   Cybiko® Wireless Handheld Computer for Teens (2000)&amp;lt;br/&amp;gt;&lt;br /&gt;
Space  -  Webb telescope personal photoshoot&amp;lt;br/&amp;gt;&lt;br /&gt;
Literature  -  Stephen King's writing desk (he's still using it so you'll have to fight him)&amp;lt;br/&amp;gt;&lt;br /&gt;
Philosophy  -  Out-of-control trolley&amp;lt;br/&amp;gt;&lt;br /&gt;
Psychology  -  A nice gift with a note saying you don't expect anything in return.&amp;lt;br/&amp;gt;&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Book promotion]]&lt;/div&gt;</summary>
		<author><name>162.158.62.217</name></author>	</entry>

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