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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2501:_Average_Familiarity&amp;diff=216417</id>
		<title>2501: Average Familiarity</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2501:_Average_Familiarity&amp;diff=216417"/>
				<updated>2021-08-12T12:20:05Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.76.239: /* Explanation */ ce myself&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2501&lt;br /&gt;
| date      = August 11, 2021&lt;br /&gt;
| title     = Average Familiarity&lt;br /&gt;
| image     = average familiarity.png&lt;br /&gt;
| titletext =  &amp;quot;How could anyone consider themselves a well-rounded adult without a basic understanding of silicate geochemistry? Silicates are everywhere! It's hard to throw a rock without throwing one!&amp;quot;&lt;br /&gt;
| imagesize =&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by A SILICATE (DON'T WE ALL KNOW THE FORMULA?).  Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
This comic claims that scientists vastly overestimate how familiar other people are with their own field of study. As an example, Randall shows a pair of {{w|geochemistry|geochemists}} specializing in {{w|silicate}} chemistry. The scientists are under the impression other people at least know the chemical makeup of {{w|olivine}}, some {{w|feldspar}}s and {{w|quartz}}. In truth, the average person can't be expected to know the chemical makeup of ''any'' arbitrarily-chosen substance reliably (or any material at all, if that average person's job and hobby do not involve chemistry — aside from the few that made their way into {{w|common knowledge}}, like H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O for water or CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; for carbonic gas), and may not even know the definition of &amp;quot;feldspar&amp;quot; beyond &amp;quot;a rock&amp;quot;, if at all.&lt;br /&gt;
&lt;br /&gt;
It even goes so far as to initially gloss over the 'everyday' knowledge of quartz. Perhaps like a gardener forgetting to mention the lawn he maintains (along with the 'actual' plants in the borders or vegetable patches), there seemed no need to mention such a trivial inclusion in the set of things ''everybody'' knows'... until prompted by the slightly-less-overestimating partner in the conversation. Quartz is a basic silicon oxide (SiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;) that ''can'' be found as distinct large-scale crystals (probably obvious to the layman, as an ice-cube is in a drink) but also features as a hard-wearing micro-constituent of many rocks, even as erosion and other processes act upon them. At a certain high level of weathering - hazily defined as between gravels and silts - sand is overwhelmingly the ultimate residual silicon-dioxide grains in most cases (the main exception to this being coral sands, which are calcium carbonates) though with varying internal linkages as SiO&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; 'units' (sharing oxygen atoms) and other residual constituents dictating the general colour, feel and other and physical qualities as you enjoy your day at the beach.&lt;br /&gt;
&lt;br /&gt;
The title text plays on the phrase &amp;quot;you can't throw a rock without hitting one,&amp;quot; a common hyperbole about how common something is. Indeed, {{w|Silicate mineral|silicate}} rocks are extremely common on Earth &amp;amp;mdash; not only would a rock thrown in a random direction stand a decent chance of striking a silicate mineral rock (assuming the thrower is out in a field instead of indoors) but the randomly-selected rock being ''thrown'' also has a very high chance of being a silicate mineral rock.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[Ponytail and Cueball are standing and talking. Ponytail has her palm raised.]&lt;br /&gt;
:Ponytail: Silicate chemistry is second nature to us geochemists, so its easy to forget that the average person probably only knows the formulas for olivine and one or two feldspars.&lt;br /&gt;
:Cueball: And quartz, of course.&lt;br /&gt;
:Ponytail: Of course.&lt;br /&gt;
&lt;br /&gt;
:[Caption below the panel]&lt;br /&gt;
:Even when they're trying to compensate for it, experts in anything wildly overestimate the average person's familiarity with their field.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
[[Category:Geology]]&lt;/div&gt;</summary>
		<author><name>141.101.76.239</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2501:_Average_Familiarity&amp;diff=216406</id>
		<title>Talk:2501: Average Familiarity</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2501:_Average_Familiarity&amp;diff=216406"/>
				<updated>2021-08-12T08:58:36Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.76.239: /* Replaced &amp;quot;average Joe&amp;quot; with &amp;quot;average person&amp;quot; */ new section&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
I've never even ''heard'' of olivine. I think most people have heard of quartz (it's the crystal in most electronic watches, and it's pretty), and I suspect feldspar is somewhere in between. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 05:21, 12 August 2021 (UTC)&lt;br /&gt;
&lt;br /&gt;
As a chemist, I heard of all of them but, fun fact, there is a mnemonic in the german language known by at least all of the elderly generation: &amp;quot;Feldspat, Quarz und Glimmer - die drei vergess´ ich nimmer!&amp;quot; thats &amp;quot;feldspar quartz and mica - i will never forget the three&amp;quot;. These three are the main compunds of granite and obviously this was stuff they had to learn at school. If, in a group of silverheads, start the phrase &amp;quot;Feldspat Quarz und Glimmer ...&amp;quot; and there will always be someone to finish the sentence. --[[User:Pauliprinzip|Pauliprinzip]] ([[User talk:Pauliprinzip|talk]]) 05:45, 12 August 2021 (UTC)&lt;br /&gt;
&lt;br /&gt;
:''and may not even know the definition of &amp;quot;feldspar&amp;quot; beyond &amp;quot;a rock&amp;quot;.'' Ironically, I think the person writing this may have overstated the &amp;quot;average Joe&amp;quot;'s familiarity with the word &amp;quot;feldspar&amp;quot;, since I couldn't have defined it if you'd asked me. --[[User:Enchantedsleeper|Enchantedsleeper]] ([[User talk:Enchantedsleeper|talk]]) 08:11, 12 August 2021 (UTC)&lt;br /&gt;
&lt;br /&gt;
== Replaced &amp;quot;average Joe&amp;quot; with &amp;quot;average person&amp;quot; ==&lt;br /&gt;
&lt;br /&gt;
Per https://en.wikipedia.org/wiki/List_of_terms_related_to_an_average_person this term is specific to the US, and introduces specificity unrelated to the comic.&lt;/div&gt;</summary>
		<author><name>141.101.76.239</name></author>	</entry>

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