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		<id>https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=2829%3A_Iceberg_Efficiency</id>
		<title>2829: Iceberg Efficiency - Revision history</title>
		<link rel="self" type="application/atom+xml" href="https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=2829%3A_Iceberg_Efficiency"/>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;action=history"/>
		<updated>2026-05-22T16:01:38Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
		<generator>MediaWiki 1.30.0</generator>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=411676&amp;oldid=prev</id>
		<title>68.101.170.57: Restructured run-on sentence for clarity. (par 3)</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=411676&amp;oldid=prev"/>
				<updated>2026-05-04T16:50:06Z</updated>
		
		<summary type="html">&lt;p&gt;Restructured run-on sentence for clarity. (par 3)&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 16:50, 4 May 2026&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-l15&quot; &gt;Line 15:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 15:&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;Black Hat's idea is characteristically absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat's idea is characteristically absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;(&lt;/del&gt;as if that's the &amp;quot;purpose&amp;quot; of icebergs &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;– in &lt;/del&gt;the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}'' &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;– &lt;/del&gt;through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners as if that's the &amp;quot;purpose&amp;quot; of icebergs&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;. (In &lt;/ins&gt;the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}''&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;). He chooses to accomplish this &lt;/ins&gt;through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas, one of them calls for security. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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 unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas, one of them calls for security. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>68.101.170.57</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=411675&amp;oldid=prev</id>
		<title>68.101.170.57: a mismatched – and ) were corrected.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=411675&amp;oldid=prev"/>
				<updated>2026-05-04T16:45:25Z</updated>
		
		<summary type="html">&lt;p&gt;a mismatched – and ) were corrected.&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 16:45, 4 May 2026&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-l15&quot; &gt;Line 15:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 15:&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;Black Hat's idea is characteristically absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat's idea is characteristically absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}''&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;) &lt;/del&gt;through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}'' &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;– &lt;/ins&gt;through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas, one of them calls for security. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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 unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas, one of them calls for security. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>68.101.170.57</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=346362&amp;oldid=prev</id>
		<title>Megan: /* Explanation */ punctuation</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=346362&amp;oldid=prev"/>
				<updated>2024-07-13T09:06:25Z</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; punctuation&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;
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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 09:06, 13 July 2024&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-l19&quot; &gt;Line 19:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 19:&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 unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas, one of them calls for security. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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 unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas, one of them calls for security. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as helium. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners is preposterous, as there's no reason to do this - and even if there were, more practical or direct methods of attacking such vessels exist{{citation needed}}&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;. &lt;/del&gt;&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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as helium. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners is preposterous, as there's no reason to do this - and even if there were, more practical or direct methods of attacking such vessels exist&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;.&lt;/ins&gt;{{citation needed}}&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;The mention of this high-tech iceberg being able to &amp;quot;more efficiently pursue fleeing hubristic liners&amp;quot; is a playful nod to the comic's theme of optimizing icebergs for efficiency at attacking ocean liners. It implies that not only can this special iceberg float efficiently, but also that it's equipped to chase after and &amp;quot;efficiently pursue&amp;quot; arrogant or prideful ocean liners, turning the concept of iceberg efficiency into a surreal scenario. The &amp;quot;hubris&amp;quot; alludes to the (possibly apocryphal) quote &amp;quot;God himself couldn't sink this ship&amp;quot; and similar sentiments expressed in reference to the ''{{w|Titanic}}''.&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 mention of this high-tech iceberg being able to &amp;quot;more efficiently pursue fleeing hubristic liners&amp;quot; is a playful nod to the comic's theme of optimizing icebergs for efficiency at attacking ocean liners. It implies that not only can this special iceberg float efficiently, but also that it's equipped to chase after and &amp;quot;efficiently pursue&amp;quot; arrogant or prideful ocean liners, turning the concept of iceberg efficiency into a surreal scenario. The &amp;quot;hubris&amp;quot; alludes to the (possibly apocryphal) quote &amp;quot;God himself couldn't sink this ship&amp;quot; and similar sentiments expressed in reference to the ''{{w|Titanic}}''.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Megan</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=327802&amp;oldid=prev</id>
		<title>172.69.65.98: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=327802&amp;oldid=prev"/>
				<updated>2023-11-02T22:44:17Z</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 22:44, 2 November 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-l17&quot; &gt;Line 17:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 17:&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there, presumably having snuck in with someone dealing with iceberg-related ideas&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;, one of them calls for security&lt;/ins&gt;. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as helium. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners is preposterous, as there's no reason to do this - and even if there were, more practical or direct methods of attacking such vessels exist{{citation needed}}. &amp;#160;&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 title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as helium. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners is preposterous, as there's no reason to do this - and even if there were, more practical or direct methods of attacking such vessels exist{{citation needed}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.69.65.98</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324843&amp;oldid=prev</id>
		<title>172.69.178.191: Expanded the explanation slightly and marked as complete as last addition was 2 weeks ago.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324843&amp;oldid=prev"/>
				<updated>2023-10-04T18:43:54Z</updated>
		
		<summary type="html">&lt;p&gt;Expanded the explanation slightly and marked as complete as last addition was 2 weeks ago.&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 18:43, 4 October 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-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&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;==Explanation==&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;==Explanation==&lt;/div&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;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;{{incomplete|Created by A 98% EFFICIENT ICEBERG. Do NOT delete this tag too soon.}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&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;This comic humorously plays with the idea of efficiency in a typically absurd and satirical &amp;quot;Black Hat&amp;quot; fashion. Black Hat starts by critiquing traditional {{w|iceberg}}s, which are mostly hidden underwater, as inefficient. Efficiency is typically measured in relation to a desired outcome or purpose; Black Hat seems to imply that the obvious purpose for icebergs is to be seen above the water. He then presents his solution - a foam-filled iceberg that floats almost entirely above the water, claiming it to be highly efficient.&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;This comic humorously plays with the idea of efficiency in a typically absurd and satirical &amp;quot;Black Hat&amp;quot; fashion. Black Hat starts by critiquing traditional {{w|iceberg}}s, which are mostly hidden underwater, as inefficient. Efficiency is typically measured in relation to a desired outcome or purpose; Black Hat seems to imply that the obvious purpose for icebergs is to be seen above the water. He then presents his solution - a foam-filled iceberg that floats almost entirely above the water, claiming it to be highly efficient.&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;Black Hat's idea is absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat's idea is &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;characteristically &lt;/ins&gt;absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least {{w|List of ships sunk by icebergs|six ships sank as a result of iceberg collisions}}, most famously the ''{{w|RMS Titanic}}'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, where they can be damaged by icebergs. The second panel shows that the foam-filled iceberg has a small attachment underneath it, perhaps a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, presumably having snuck in with &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;one of the authorized people&lt;/del&gt;. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;, especially after Black Hat brings in the idea of torpedoes, presumably alerting them to the idea that the presentation is not just some incomprehensible novel idea for mitigating climate change or some other advantageous purpose. Realizing that Black Hat is not authorized to be there&lt;/ins&gt;, presumably having snuck in with &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;someone dealing with iceberg-related ideas&lt;/ins&gt;. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as helium. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners is preposterous, as there's no reason to do this - and even if there were, more practical or direct methods of attacking such vessels exist{{citation needed}}. &amp;#160;&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 title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as helium. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners is preposterous, as there's no reason to do this - and even if there were, more practical or direct methods of attacking such vessels exist{{citation needed}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.69.178.191</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324467&amp;oldid=prev</id>
		<title>DKMell: cleanup</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324467&amp;oldid=prev"/>
				<updated>2023-09-27T00:49:30Z</updated>
		
		<summary type="html">&lt;p&gt;cleanup&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 00:49, 27 September 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-l16&quot; &gt;Line 16:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 16:&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;Black Hat's idea is absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat's idea is absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least six ships sank &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;directly &lt;/del&gt;as a result of iceberg collisions, most famously the ''Titanic'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;which &lt;/del&gt;can be damaged by &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;an iceberg&lt;/del&gt;. The second panel shows that the foam-filled iceberg has a small attachment underneath it, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;which is apparently &lt;/del&gt;a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;{{w|List of ships sunk by icebergs|&lt;/ins&gt;six ships sank as a result of iceberg collisions&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;}}&lt;/ins&gt;, most famously the ''&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;{{w|RMS &lt;/ins&gt;Titanic&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;}}&lt;/ins&gt;'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;where they &lt;/ins&gt;can be damaged by &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;icebergs&lt;/ins&gt;. The second panel shows that the foam-filled iceberg has a small attachment underneath it, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;perhaps &lt;/ins&gt;a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, presumably having snuck in with one of the authorized people. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;..&lt;/del&gt;.&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;The unnamed individuals in the last panel are clearly baffled and concerned at how Black Hat got to presenting this slideshow, presumably having snuck in with one of the authorized people. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion.&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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Helium&lt;/del&gt;. {{w&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;|Helium&lt;/del&gt;|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;would likely be seen &lt;/del&gt;as &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;preposterous&lt;/del&gt;, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;as &lt;/del&gt;more practical or direct methods of attacking such vessels exist{{citation needed}}&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, thereby adding an extra layer of exaggerative humor to the comic&lt;/del&gt;. &amp;#160;&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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;helium&lt;/ins&gt;. {{w|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;is preposterous&lt;/ins&gt;, as &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;there's no reason to do this - and even if there were&lt;/ins&gt;, more practical or direct methods of attacking such vessels exist{{citation needed}}. &amp;#160;&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;The mention of this high-tech iceberg being able to &amp;quot;more efficiently pursue fleeing hubristic liners&amp;quot; is a playful nod to the comic's theme of optimizing icebergs for efficiency. It implies that not only can this special iceberg float efficiently, but it's &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;also &lt;/del&gt;equipped to chase after and &amp;quot;efficiently pursue&amp;quot; arrogant or prideful ocean liners, turning the concept of iceberg efficiency into a surreal scenario. The &amp;quot;hubris&amp;quot; alludes to the (possibly apocryphal) quote &amp;quot;God himself couldn't sink this ship&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;,&lt;/del&gt;&amp;quot; and similar sentiments expressed in reference to the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;ocean liner &lt;/del&gt;{{w|Titanic}}&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, which struck an iceberg and sank with many casualties&lt;/del&gt;.&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;The mention of this high-tech iceberg being able to &amp;quot;more efficiently pursue fleeing hubristic liners&amp;quot; is a playful nod to the comic's theme of optimizing icebergs for efficiency &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;at attacking ocean liners&lt;/ins&gt;. It implies that not only can this special iceberg float efficiently, but &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;also that &lt;/ins&gt;it's equipped to chase after and &amp;quot;efficiently pursue&amp;quot; arrogant or prideful ocean liners, turning the concept of iceberg efficiency into a surreal scenario. The &amp;quot;hubris&amp;quot; alludes to the (possibly apocryphal) quote &amp;quot;God himself couldn't sink this ship&amp;quot; and similar sentiments expressed in reference to the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;''&lt;/ins&gt;{{w|Titanic}}&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;''&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;/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;==Transcript==&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;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>DKMell</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324159&amp;oldid=prev</id>
		<title>Eelitee: I don't know if there's any examples of Black Hat presenting something, but I know he regularly gives absurd ideas like in 2753...</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324159&amp;oldid=prev"/>
				<updated>2023-09-21T19:15:44Z</updated>
		
		<summary type="html">&lt;p&gt;I don&amp;#039;t know if there&amp;#039;s any examples of Black Hat presenting something, but I know he regularly gives absurd ideas like in 2753...&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 19:15, 21 September 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-l18&quot; &gt;Line 18:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 18:&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least six ships sank directly as a result of iceberg collisions, most famously the ''Titanic'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, which can be damaged by an iceberg. The second panel shows that the foam-filled iceberg has a small attachment underneath it, which is apparently a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least six ships sank directly as a result of iceberg collisions, most famously the ''Titanic'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, which can be damaged by an iceberg. The second panel shows that the foam-filled iceberg has a small attachment underneath it, which is apparently a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned.&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;The unnamed individuals in the last panel are clearly baffled and concerned &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;at how Black Hat got to presenting this slideshow, presumably having snuck in with one of the authorized people. This is just another typical example of Black Hat presenting absurd ideas in a calm fashion..&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;/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;The title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as Helium. {{w|Helium|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners, would likely be seen as preposterous, as more practical or direct methods of attacking such vessels exist{{citation needed}}, thereby adding an extra layer of exaggerative humor to the comic. &amp;#160;&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 title text introduces the concept of an &amp;quot;experimental aerogel iceberg with helium pockets.&amp;quot; {{w|Aerogel|Aerogels}} are a class of solid, porous materials known for their extremely low density (making them among the lightest solid materials yet synthesized). Their low density should make them float well in liquids, though their low mass and their porous and brittle material properties make them unsuitable as a ramming implement. They are very strong for their mass, but would not be able to support iceberg-sized amounts without collapsing without internal supports which would vastly outweigh the aerogel. Most aerogels cannot float in water without some kind of surrounding coating or container, since the water would soak into the aerogel as it does a sponge. Worse, most aerogels are very hygroscopic, and [http://www.aerogel.org/?p=1433#:~:text=It%20is%20possible%20to%20make,superinsulating%20abilities%20without%20supercritical%20drying. contact with liquid water can destroy them] because attraction to the water collapses the structure. (This can be prevented by treating the aerogel with a hydrophobic material that coats the aerogel particles.) The structure of an aerogel surrounds pockets of air, leaving spaces that could be infused with a specific gas such as Helium. {{w|Helium|Helium}} is lighter than air, and is often used to make gas-filled objects such as balloons float. An aerogel iceberg infused with helium gas could theoretically hover or fly like a balloon as suggested in the comic. This idea of producing a man-made flying iceberg for the sole purpose of endangering cruise liners, would likely be seen as preposterous, as more practical or direct methods of attacking such vessels exist{{citation needed}}, thereby adding an extra layer of exaggerative humor to the comic. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Eelitee</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324017&amp;oldid=prev</id>
		<title>172.70.126.24: Grammar</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324017&amp;oldid=prev"/>
				<updated>2023-09-20T17:53:35Z</updated>
		
		<summary type="html">&lt;p&gt;Grammar&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 17:53, 20 September 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-l16&quot; &gt;Line 16:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 16:&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;Black Hat's idea is absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat's idea is absurd. Icebergs are naturally formed structures, with no particular purpose in existing. It is possible to imagine edge cases where a &amp;quot;more efficient&amp;quot; iceberg would be desirable, such as if the goal were to increase the overall {{w|albedo}} of the planet (perhaps to mitigate climate change), but on the whole his proposal to create a &amp;quot;foam-filled iceberg&amp;quot; is not only impractical but also comically exaggerated.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least six ships sank directly as a result of iceberg collisions, famously the ''Titanic'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, which can be damaged by an iceberg. The second panel shows that the foam-filled iceberg has a small attachment underneath it, which is apparently a turret for launching torpedoes.&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;Black Hat then absurdly suggests that his lightweight iceberg can still pose a threat to ocean liners (as if that's the &amp;quot;purpose&amp;quot; of icebergs – in the 20th century, at least six ships sank directly as a result of iceberg collisions, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;most &lt;/ins&gt;famously the ''Titanic'') through the use of torpedoes. In addition, given that Black Hat is promoting the idea that icebergs ''should'' be able to damage ships, it's not really so inefficient to have much of the iceberg underwater, since ocean liners also have a significant portion of their hulls underwater, which can be damaged by an iceberg. The second panel shows that the foam-filled iceberg has a small attachment underneath it, which is apparently a turret for launching torpedoes.&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;The unnamed individuals in the last panel are clearly baffled and concerned.&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 unnamed individuals in the last panel are clearly baffled and concerned.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.70.126.24</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324003&amp;oldid=prev</id>
		<title>172.71.242.123: /* Transcript */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=324003&amp;oldid=prev"/>
				<updated>2023-09-20T04:11:03Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Transcript&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;
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				&lt;col class=&quot;diff-content&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 04:11, 20 September 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-l25&quot; &gt;Line 25:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 25:&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;==Transcript==&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;==Transcript==&lt;/div&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;:[Black Hat is holding a stick and standing next to an image of an iceberg halfway submerged in water, presenting to an unseen audience.]&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;:[Black Hat is holding a stick and standing next to &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;a projection screen, or rolled-down printed poster, featuring &lt;/ins&gt;an image of an iceberg halfway submerged in water, presenting to an unseen audience &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;to the right&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;:Black Hat: A standard iceberg is only 10% efficient.&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;:Black Hat: A standard iceberg is only 10% efficient.&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;:Black Hat: 90% of the ice is hidden underwater, totally wasted.&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;:Black Hat: 90% of the ice is hidden underwater, totally wasted.&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;:[Black Hat is now standing next to an image of the same iceberg&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, &lt;/del&gt;with another &amp;quot;iceberg&amp;quot; almost entirely above the surface of the water to the right of it.]&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;:[Black Hat is now &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;seen face on, &lt;/ins&gt;standing next to an &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;updated &lt;/ins&gt;image of the same iceberg with another &amp;quot;iceberg&amp;quot; &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;with all but a small hemispherical lobe &lt;/ins&gt;almost entirely above the surface of the water &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;now &lt;/ins&gt;to the right of it.]&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;:Black Hat: Our next-generation foam-filled iceberg achieves near-100% efficiency, floating almost entirely above the ocean surface.&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;:Black Hat: Our next-generation foam-filled iceberg achieves near-100% efficiency, floating almost entirely above the ocean surface.&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;:[Black Hat is still holding a stick, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;but is standing next &lt;/del&gt;to &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;nothing&lt;/del&gt;. There are no other people directly shown, but three distinct 'off-frame' voices are indicated.]&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;:[Black Hat is still holding a stick, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;facing right, any current image/screen no longer visible &lt;/ins&gt;to &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;his rear&lt;/ins&gt;. There are no other people directly shown, but three distinct 'off-frame' voices are indicated &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;from the right&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;:Black Hat: &amp;quot;But wait,&amp;quot; you might be thinking. &amp;quot;How will such a lightweight iceberg pose a threat to hubristic ocean liners?&amp;quot;&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;:Black Hat: &amp;quot;But wait,&amp;quot; you might be thinking. &amp;quot;How will such a lightweight iceberg pose a threat to hubristic ocean liners?&amp;quot;&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;:Black Hat: That's where the torpedoes come in.&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;:Black Hat: That's where the torpedoes come in.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.71.242.123</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=323997&amp;oldid=prev</id>
		<title>Certified nqh: removed incomplete tag for transcript</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2829:_Iceberg_Efficiency&amp;diff=323997&amp;oldid=prev"/>
				<updated>2023-09-19T23:18:40Z</updated>
		
		<summary type="html">&lt;p&gt;removed incomplete tag for transcript&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
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				&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 23:18, 19 September 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-l25&quot; &gt;Line 25:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 25:&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;==Transcript==&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;==Transcript==&lt;/div&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;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&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;:[Black Hat is holding a stick and standing next to an image of an iceberg halfway submerged in water, presenting to an unseen audience.]&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;:[Black Hat is holding a stick and standing next to an image of an iceberg halfway submerged in water, presenting to an unseen audience.]&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;:Black Hat: A standard iceberg is only 10% efficient.&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;:Black Hat: A standard iceberg is only 10% efficient.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Certified nqh</name></author>	</entry>

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