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		<updated>2026-04-15T10:43:36Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:379:_Forgetting&amp;diff=378726</id>
		<title>Talk:379: Forgetting</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:379:_Forgetting&amp;diff=378726"/>
				<updated>2025-06-01T18:51:59Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.216.190: Not cueball?&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;The syntax for pointers in C++ is ''&amp;amp;pointer'' and ''*pointer''. The arrow syntax is used e.g. in PHP. So this explain does need a review. And furthermore it should focus on the assert joke, understandable for non programmers.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 18:48, 31 July 2013 (UTC)&lt;br /&gt;
:Actually this works in C++ too. (*pointer).property is the same as pointer-&amp;gt;property -- 17:58, 31 july 2013 (Time in Florida)&lt;br /&gt;
::Do you have a code snippet, maybe this could help me to explain this comic for non programmers.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:43, 31 July 2013 (UTC)&lt;br /&gt;
:::At the moment I don't have a computer, just my phone, but I'll try (so i appologize for any typos in advance, you may correct them)&lt;br /&gt;
pair&amp;lt;int, int&amp;gt;* pntr = make_pair(5, 8);&lt;br /&gt;
cout &amp;lt;&amp;lt; (*pntr).first &amp;lt;&amp;lt; endl;&lt;br /&gt;
cout &amp;lt;&amp;lt; pntr-&amp;gt;first &amp;lt;&amp;lt; endl; // the same as above&lt;br /&gt;
:::: The arrow operator -&amp;gt; is a valid way to access object members using smart ptrs in C++&lt;br /&gt;
-- 22:12, 31 July 2013 (Florida)&lt;br /&gt;
:I removed PHP as a possible language since PHP variable names start with a $. Zetfr 09:24, 20 May 2015 (UTC)&lt;br /&gt;
::IT IS A COMBINACION EN C++/ANOTHER LENGUAGE IN THE FOURTH PANEL ASSERT HAS NOT PARENTHESES. IN C++ THE ASSERT MUST HAVE THE PARENTHESES AND SO CANNOT BE A C++ PROGRAM. PLEASE ADVISE {{unsigned ip|108.162.210.219}}&lt;br /&gt;
:::I think he meant it as c++. Higher level languages that forego the parens tend to also forego the semicolon. Probably just a typo on Randall's part since he had recently learned Python relative to this. {{unsigned|Flewk}}&lt;br /&gt;
&lt;br /&gt;
man this one made me cry...&lt;br /&gt;
&lt;br /&gt;
if i could at least forget what happened to sally...&lt;br /&gt;
i wish it was as easy as &amp;quot;del filename&amp;quot;.&lt;br /&gt;
&lt;br /&gt;
this one, sadly, is too relatable for me. [[User:An user who has no account yet|An user who has no account yet]] ([[User talk:An user who has no account yet|talk]]) 15:56, 5 September 2023 (UTC)&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Isn't this black hat, rather than cueball? But following on from two comics earlier?&lt;/div&gt;</summary>
		<author><name>162.158.216.190</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3071:_Decay_Chain&amp;diff=371272</id>
		<title>3071: Decay Chain</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3071:_Decay_Chain&amp;diff=371272"/>
				<updated>2025-04-04T01:10:54Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.216.190: /* Explanation */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3071&lt;br /&gt;
| date      = April 2, 2025&lt;br /&gt;
| title     = Decay Chain&lt;br /&gt;
| image     = decay_chain_2x.png&lt;br /&gt;
| imagesize = 312x595px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = If you have an old phone in a drawer, and you listen very carefully, you can occasionally hear the occasional tap of an emitted SIM card hitting the side of the drawer as the phone transmutes to a lower-end model.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by an iPhone 6 that used to be an iPhone 13 - Please change this comment when editing this page. Do NOT delete this tag too soon.}}&lt;br /&gt;
This comic is a play on nuclear {{w|decay chains}}, the series of radioactive disintegrations that the nuclei of unstable atoms undergo. Example diagrams of such nuclear decay chains can be seen {{w|Decay_chain#Thorium_series|here}}. This comic suggests that as iPhones model iterations get higher, they, similarly to heavier chemical elements, become unstable and susceptible to decay into lesser models. Some isotopes of atoms decay into other isotopes, releasing particles in the process. This process is generally dictated by the number of the positively charged protons in an atomic nucleus, which dictate its chemical identity, and the neutrons, which keep the protons in as stable a clump as possible. Particular isotopes, increasingly so for heavier atoms, are known to be subject to one or more modes of {{w|nuclear decay}} in order to attain a more stable and simpler form, including by several such steps. This comic humorously explores how an iPhone would decay if decaying worked similarly, which is absurd as iPhones aren't subject to atomic decay.{{Citation needed}} (Almost all matter on Earth, including iPhones, contain ''some'' atoms that are radioactive, mixed with a non-radioactive majority.)&lt;br /&gt;
&lt;br /&gt;
The difference between iPhones undergoing {{w|alpha decay|alpha (''α'') decay}} (vertically downwards, in the diagram) is the change in model number from a higher one to a model two steps lower, except for the step involving the iPhone X which apparently exists instead of a &amp;quot;9&amp;quot; model. This is equivalent to the change in {{w|atomic number}} when two protons together with two neutrons leave the nucleus in the form of a helium ion (He&amp;lt;sup&amp;gt;2+&amp;lt;/sup&amp;gt;), known as an alpha particle. The atomic number of such atoms reduces by two and the {{w|mass number}} reduces by four (that held by the departing He&amp;lt;sup&amp;gt;2+&amp;lt;/sup&amp;gt;), though no evidence is given as to how the respective masses of the phones ''actually'' changes in this analogy. The specific reason for the decay chain stopping at iPhone '''7''' is unknown, although a possible reason for this is because lithium, which is often used in phone batteries, has the stable isotope lithium-7. &amp;quot;Stable&amp;quot; may refer to the usability of the device in terms of whether or not the device still receives security updates, but the iPhone 6s also received the [https://support.apple.com/en-us/100100 latest security patch] as of the time this comic was published.&lt;br /&gt;
&lt;br /&gt;
The process of beta minus (''β''&amp;lt;sup&amp;gt;-&amp;lt;/sup&amp;gt;) decay (in elements, the effective conversion of a neutron into a proton and a free electron) raises the atomic number by one by transforming a neutral particle to a positive one via emission of a small negatively charged {{w|beta particle}} (an electron), leaving the mass only slightly decreased. In the terms of iPhones, this is represented by the removal of a brand-name modifier (usually denoting additional features included within the same model range) in order to perform a version-upgrade but now being closer to that new range's most basic release of model. This is represented by a rightward-and-upward step. The decay step from the iPhone 13 Pro to the iPhone 14 Plus, which is missing a symbol, is clearly one of the ''β''&amp;lt;sup&amp;gt;-&amp;lt;/sup&amp;gt; decay steps.&lt;br /&gt;
&lt;br /&gt;
(After alpha or beta decay, atoms may then emit {{w|gamma radiation}} (high-energy photons) as they rearrange their atomic state without changing their composition, but this process does not change the element in any meaningful way. It also will occur when neutron capture and/or atomic fission has occured, which is generally considered outside the natural decay chain of any such isotope, and can also result from nuclear fusion. Beta decay also requires emission of an antineutrino, but that particle interacts so weakly with matter that it's undetectable except by extremely sensitive experimental equipment.)&lt;br /&gt;
&lt;br /&gt;
The title text suggests that the &amp;quot;alpha particle&amp;quot; of the iPhone is a {{w|SIM card}}, and that alpha-decaying phones will emit one of these with each decay (despite few phones having more than two, and most working ones only having one, but perhaps that's part of the mystery of telephonic {{w|Nuclear transmutation|transmutation}}). The sound of an old phone, sitting in a drawer, ejecting the unnecessary SIM is likened to the slow click of a {{w|Geiger counter}} registering the decay particles ejected from a decaying radioisotope. Radioactive decay is a random and spontaneous process; without the sound, one would never otherwise know if the phone even ''had'' decayed without {{w|Schrödinger's cat|opening the drawer}} to find out.&lt;br /&gt;
&lt;br /&gt;
A similar comparison between smartphones and stars happened in [[1422: My Phone is Dying]].&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;
[A flowchart with arrows leading from a circle with the words &amp;quot;iPhone 16 Pro Max&amp;quot;, to circles with other iPhone names, eventually leading to a circle with the words &amp;quot;iPhone 7&amp;quot;]&lt;br /&gt;
&lt;br /&gt;
:[Caption below the panel:]&lt;br /&gt;
:Physicists believe that an iPhone 16 Pro Max will, if left alone long enough, eventually decay into an iPhone 7, the heaviest stable model.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Smartphones]]&lt;br /&gt;
[[Category:Physics]]&lt;/div&gt;</summary>
		<author><name>162.158.216.190</name></author>	</entry>

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