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		<updated>2026-04-17T05:16:41Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=848:_3D&amp;diff=130061</id>
		<title>848: 3D</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=848:_3D&amp;diff=130061"/>
				<updated>2016-11-06T03:10:49Z</updated>
		
		<summary type="html">&lt;p&gt;Skyhi14: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 848&lt;br /&gt;
| date      = January 17, 2011&lt;br /&gt;
| title     = 3D&lt;br /&gt;
| image     = 3d.png&lt;br /&gt;
| titletext = The LINACs in the glasses frames can barely manage one MeV. You should've gone to the screening at CERN.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{w|String theory}} hypothesizes that there are many more than 3 dimensions, it's just that we can't see the rest because they're &amp;quot;rolled up.&amp;quot; A common metaphor is an ant on a tightrope — it has two degrees of freedom, one along the rope and one around it, but from far away we can only see one.&lt;br /&gt;
&lt;br /&gt;
So [[Black Hat]] released his 2D movie about string theory in &amp;quot;3D&amp;quot;, and claimed that the third dimension was there — just too small to see.&lt;br /&gt;
&lt;br /&gt;
The title text refers to {{w|linear particle accelerators}}, or &amp;quot;LINACs,&amp;quot; which are used to create high-energy particles. Incidentally, the glasses give their particles one mega-electronvolt (symbol {{w|MeV}}) of energy, which is not particularly high for a particle accelerator. The title text suggests that such moviegoers should try the accelerators at the Center for European Nuclear Research, {{w|CERN}}, since they are widely known for producing the highest energies in the millions of MeV, and thus have the best chance of unraveling the small dimensions of string theory.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[People are lined up to see a movie.]&lt;br /&gt;
:Premiering Tonight:&lt;br /&gt;
:String Theory:&lt;br /&gt;
:An Exposé&lt;br /&gt;
:Presented In 3D!&lt;br /&gt;
&lt;br /&gt;
:[The people are in a dark theater, fiddling with their glasses.]&lt;br /&gt;
:''???''&lt;br /&gt;
&lt;br /&gt;
:[The people approach black hat guy, who's sitting at a desk.]&lt;br /&gt;
:Megan: Your movie was a ripoff.&lt;br /&gt;
:Cueball: It wasn't 3D at all!&lt;br /&gt;
:Black Hat: Was too.&lt;br /&gt;
:Black Hat: It's just that the third dimension is tightly rolled up and too small to observe at normal energies.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Black Hat]]&lt;br /&gt;
[[Category:Comics with inverted brightness]]&lt;br /&gt;
[[Category:Physics]]&lt;/div&gt;</summary>
		<author><name>Skyhi14</name></author>	</entry>

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