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		<id>https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=1240%3A_Quantum_Mechanics</id>
		<title>1240: Quantum Mechanics - Revision history</title>
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		<updated>2026-04-17T23:42:37Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1240:_Quantum_Mechanics&amp;diff=402340&amp;oldid=prev</id>
		<title>Acagastya: Add Category:Dogs</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=1240:_Quantum_Mechanics&amp;diff=402340&amp;oldid=prev"/>
				<updated>2025-12-23T22:16:00Z</updated>
		
		<summary type="html">&lt;p&gt;Add &lt;a href=&quot;/wiki/index.php/Category:Dogs&quot; title=&quot;Category:Dogs&quot;&gt;Category:Dogs&lt;/a&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 22:16, 23 December 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l38&quot; &gt;Line 38:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 38:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Physics]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Physics]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Animals]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Animals]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Category:Dogs]]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Religion]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Religion]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Acagastya</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1240:_Quantum_Mechanics&amp;diff=305729&amp;oldid=prev</id>
		<title>172.70.34.6: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=1240:_Quantum_Mechanics&amp;diff=305729&amp;oldid=prev"/>
				<updated>2023-02-04T03:06:16Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 03:06, 4 February 2023&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l12&quot; &gt;Line 12:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 12:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The phrase “according to quantum mechanics” betrays the speaker's lack of knowledge about the subject. To a physicist, it is almost as vague as “according to physics”. Somebody who understands the subject would use a more precise term, such as “according to the uncertainty principle” or “according to a paper by such-and-such.”&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The phrase “according to quantum mechanics” betrays the speaker's lack of knowledge about the subject. To a physicist, it is almost as vague as “according to physics”. Somebody who understands the subject would use a more precise term, such as “according to the uncertainty principle” or “according to a paper by such-and-such.”&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Cueball]] explains to [[Ponytail]] that dogs must have {{w|souls}}. This would be against the doctrine of certain religions, including some sects of Christianity, which teach that only humans have souls. The question of whether animals have souls comes up for many reasons in theological and philosophical discussions. One major one is the wish of many dog owners to meet their pets in {{w|Heaven}}. &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;For &lt;/del&gt;this &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;to come to pass, it &lt;/del&gt;would &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;be necessary for &lt;/del&gt;dogs not only to have souls, but also ''immortal'' souls. This distinction comes up in Catholicism, for example, where the commonly taught doctrine, as in [http://dhspriory.org/thomas/english/ContraGentiles2.htm#82 Aquinas, S.C.G. II, C. 82], is that, while animals do have souls, their souls are mortal, and therefore die with their bodies. In this case, animals cannot enter Heaven, {{w|Hell}}, or {{w|Purgatory}}.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Cueball]] explains to [[Ponytail]] that dogs must have {{w|souls}}. This would be against the doctrine of certain religions, including some sects of Christianity, which teach that only humans have souls. The question of whether animals have souls comes up for many reasons in theological and philosophical discussions. One major one is the wish of many &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Christian &lt;/ins&gt;dog owners to meet their pets in {{w|Heaven}}. &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;In many Christian doctrines, &lt;/ins&gt;this would &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;require &lt;/ins&gt;dogs not only to have souls, but also ''immortal'' souls. This distinction comes up in Catholicism, for example, where the commonly taught doctrine, as in [http://dhspriory.org/thomas/english/ContraGentiles2.htm#82 Aquinas, S.C.G. II, C. 82], is that, while animals do have souls, their souls are mortal, and therefore die with their bodies. In this case, animals cannot enter Heaven, {{w|Hell}}, or {{w|Purgatory}}.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cueball, however, uses quantum mechanics as an argument, even though quantum mechanics is only applicable on the atomic scale and not on macroscopic objects like animals. It also only applies to matter and energy, and not to souls, which are held by most doctrines to be immaterial. His argument, however, is a reference to the concept of an '{{w|Observer (quantum physics)|observer}}' in quantum physics, as well as theories about the {{w|Von Neumann–Wigner interpretation|collapse of wave functions}}. It should also be noted that science does not equate the ability to observe the world and possession of a soul, and that the latter is merely a theological concept, not used in science and not proven to exist in real world.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cueball, however, uses quantum mechanics as an argument, even though quantum mechanics is only applicable on the atomic scale and not on macroscopic objects like animals. It also only applies to matter and energy, and not to souls, which are held by most doctrines to be immaterial. His argument, however, is a reference to the concept of an '{{w|Observer (quantum physics)|observer}}' in quantum physics, as well as theories about the {{w|Von Neumann–Wigner interpretation|collapse of wave functions}}. It should also be noted that science does not equate the ability to observe the world and possession of a soul, and that the latter is merely a theological concept, not used in science and not proven to exist in real world.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.70.34.6</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1240:_Quantum_Mechanics&amp;diff=262965&amp;oldid=prev</id>
		<title>Jacky720: rv</title>
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				<updated>2022-05-04T23:50:08Z</updated>
		
		<summary type="html">&lt;p&gt;rv&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=1240:_Quantum_Mechanics&amp;amp;diff=262965&amp;amp;oldid=262939&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>Jacky720</name></author>	</entry>

	<entry>
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		<title>Ex Kay Cee Dee at 23:50, 4 May 2022</title>
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				<updated>2022-05-04T23:50:03Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
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		<author><name>Ex Kay Cee Dee</name></author>	</entry>

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		<title>Jacky720: rv</title>
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				<updated>2022-05-04T22:10:12Z</updated>
		
		<summary type="html">&lt;p&gt;rv&lt;/p&gt;
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		<author><name>Jacky720</name></author>	</entry>

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		<title>Ex Kay Cee Dee at 22:09, 4 May 2022</title>
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				<updated>2022-05-04T22:09:16Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
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		<author><name>Ex Kay Cee Dee</name></author>	</entry>

	<entry>
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				<updated>2022-05-04T21:46:24Z</updated>
		
		<summary type="html">&lt;p&gt;rv&lt;/p&gt;
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		<author><name>Jacky720</name></author>	</entry>

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		<title>Ex Kay Cee Dee at 21:46, 4 May 2022</title>
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				<updated>2022-05-04T21:46:22Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
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		<author><name>Ex Kay Cee Dee</name></author>	</entry>

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				<updated>2022-05-04T21:46:15Z</updated>
		
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		<author><name>Jacky720</name></author>	</entry>

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		<title>Ex Kay Cee Dee at 21:46, 4 May 2022</title>
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				<updated>2022-05-04T21:46:14Z</updated>
		
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		<author><name>Ex Kay Cee Dee</name></author>	</entry>

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