https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&feedformat=atom&user=FatPhilexplain xkcd - User contributions [en]2026-04-15T22:48:25ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=2982:_Water_Filtration&diff=3503062982: Water Filtration2024-09-11T09:50:36Z<p>FatPhil: /* Explanation */ regular osmosis and x-ray sterilisation</p>
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<div>{{comic<br />
| number = 2982<br />
| date = September 6, 2024<br />
| title = Water Filtration<br />
| image = water_filtration_2x.png<br />
| imagesize = 593x467px<br />
| noexpand = true<br />
| titletext = You'd think the most expensive part would be the quark-gluon plasma chamber, but it's actually usually the tube to the top of the atmosphere to carry the cosmic rays down.<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by WATER. JUST PLAIN WATER. NOTHING DONE TO IT, JUST PLAIN WATER. POSSIBLY DRINKABLE. - Do NOT <s>drink the water</s> delete this tag too soon.}}<br />
This comic seems to be a diagram of how well water is purified, a common procedure done to make said water safe to drink. However, this well water is "purified" through a series of increasingly unnecessary, expensive, and possibly hazardous steps, ending with producing "pure" water synthesized from hydrogen and oxygen (which have each been synthesized from subatomic particles) - before promptly undoing most of the work by re-adding raw well water, and its original minerals and probiotics (which is one way of describing contaminants and biological pathogens) "for taste and to support immune health".<br />
<br />
{| class="wikitable"<br />
|-<br />
!Step<br />
!Real Device?<br />
!Used for water treatment?<br />
!Explanation<br />
|-<br />
|Water softener<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|{{w|Water softening}} is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes and fittings. The comic shows the water either being passed through some granulated material (presumably, {{w|ion-exchange resins}}) or into a precipitation chamber for lime (or soda ash) softening.<br />
|-<br />
|Reverse osmosis<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|{{w|Reverse osmosis}} is a common step used in modern water-purification systems. It relies on using osmotic membranes and high pressures to separate water molecules from dissolved solutes and biological substances. Interestingly, it would also act as a softening step, rendering the previous step potentially redundant, depending on the goals for each step. It's also overkill for most wells, as groundwater often needs treatment targeted to only a few contaminants, if any treatment at all. <br />
|-<br />
|Ultraviolet Sterilization<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|{{w|Ultraviolet germicidal irradiation|Ultraviolet sterilization}} uses UV lamps at short wavelengths to damage the DNA and thereby kill micro-organisms in the water. In the USA, this is an unlikely method of well water sterilization, as the pathogens most likely to be found in well water (as opposed to surface water) are generally much more responsive to chemical disinfection. Many wells don't even need a disinfection step; whether this well needs disinfection or not, this is hardly the most impractical step in this treatment train. <br />
|-<br />
|Autoclave<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|{{w|Autoclaves}} are essentially large pressure cookers that sterilize items and liquids through exposing them to a high temperature (~120°C or ~248°F) over tens of minutes in presence of water. By maintaining a high pressure, the boiling point of water goes up. This creates a very hot and humid atmosphere, making efficient heat transfer with all contents and inactivating all biological entities through this heat. They are commonly used in hospital and laboratory settings to sterilize plastics, glassware, equipment and solutions (like bottles of growth medium for bacteria) to be used in a sterile environment. The advantage of this method compared to dry heat (aka putting things in a 150°C-180°C oven until they are sterile) is that most lab plastics survive a passage at 120°C without melting. While difficult to streamline (as this technique is used for batches), it has the advantage over light-based methods that heat gets everywhere, and that instead of just damaging DNA, you also denature the proteins and other structures of microorganisms. <br />
|-<br />
|Condenser<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|This step condenses the steam generated by the autoclave back into water. This is a normal part of the process used in "traditional" water purification by distillation. <br />
|-<br />
|Regular osmosis<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|Regular osmosis (also known as "osmosis") is the tendency of a solvent (like water) to flow through a semipermeable membrane towards the side that has a higher concentration of dissolved molecules or ions. It therefore goes from a purer state to a less pure state, the opposite of filtration.<br />
|-<br />
|X-Ray Sterilization<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|While {{w|Sterilization_(microbiology)#Ionizing_radiation_sterilization|x-ray sterilization}} is used to sterilize equipment, but may also be used as a cold method (in contrast to techniques like pasteurization) of eliminating germs and killing insects in fresh foodstuffs. Has also been used to sterilize postal mail.<br />
|-<br />
|Carbon Filter<br />
|{{No|Fake}}<br />
|{{No}}<br />
|The water is passed through some volume of carbon - a riff on activated carbon filters, which ''are'' used in water filtration as seen later in the process. The exact {{w|allotropy|allotrope}} of carbon is not mentioned, so this could possibly be a graphite, carbon nanotubes, or even solid diamond "filter".<br />
|-<br />
|Neutron Source<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|A {{w|neutron source}} generates high-energy neutrons. High-energy neutrons are highly penetrating and will cause ionization events to occur due to collision with atoms in the water. This can potentially make the water more radioactive due to the generation of radioactive isotopes.<br />
|-<br />
|Activated Carbon Filter<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|{{w|Activated carbon}} is a form of carbon commonly used to filter contaminants from water and air, as it has a large surface area available to adsorb impurities on its surface. While this isn't a strange step to see in a water purification process, Randall makes a pun here with its proximity to the neutron source - the carbon has been '{{w|Neutron activation|activated}}' by the neutron source, and is currently radioactive. Water filtered through this may pick up radioactive isotopes from the filter.<br />
|-<br />
|Gamma Ray Sterilization<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|Similar to x-ray sterilization, this step uses {{w|Sterilization (microbiology)#Ionizing radiation sterilization|gamma rays}} to sterilize the water. Gamma rays can potentially irradiate the water through photodisintegration if their energy is higher than the binding energy of oxygen.<br />
|-<br />
|Cosmic Ray Sterilization<br />
|{{No|Fake}}<br />
|{{No}}<br />
|Similar to the previous step, but this time using high energy {{w|cosmic rays}} to do so. This would be incredibly impractical, as cosmic rays are generally blocked by the atmosphere at high altitudes (as stated in the title text). Furthermore, their extremely high energy (shown to be in the exa-electron volt (EeV, or 10<sup>18</sup> eV) range) would cause multiple high-energy particles to be created on impact with the water molecules, irradiating the water significantly.<br />
|-<br />
|Electrolysis<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|The water is broken down into hydrogen and oxygen gas using an electric current. Assuming the gas outputs of this process are pure hydrogen and oxygen gas, this *would* be an extremely effective sterilization tactic, seeing as no known organism or water pollutant is entirely composed out of hydrogen or oxygen gas. Along with the next step, this step may be a misguided attempt to "take the water apart and clean each part individually". The hydrogen is sent to the ionizer, while the oxygen is sent to the oxygen spallation step.<br />
|-<br />
|Oxygen Spallation<br />
|{{No|Fake}}<br />
|{{No}}<br />
|Almost all oxygen in existence was originally created via {{w|stellar nucleosynthesis}}. Now, in this step in the purification, the oxygen is apparently broken down back into hydrogen via a fictional form of {{w|Cosmic_ray_spallation|spallation}}. While spallation can form lighter nuclei from heavier ones, there is no known process to convert oxygen back down to hydrogen. It is unclear what happens to the neutrons present in the oxygen nuclei - whether they are removed, used to create hydrogen isotopes or allowed to decay into protons and electrons (the components of yet more hydrogen, when properly reintroduced). The hydrogen formed here is merged with the rest of the hydrogen before being sent to the ionizer.<br />
|-<br />
|Ionizer<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|The hydrogen output by the previous step is made into a plasma with free electrons and protons (not bound into atoms).<br />
|-<br />
|Quark-Gluon Plasma Chamber<br />
|{{No|Fake}}<br />
|{{No}}<br />
|The plasma output from the previous step is further energized into a {{w|quark–gluon plasma}}, such as the one found just after the Big Bang. This follows the theme of the previous steps, which all serve to break the water down into their elementary components. The incredible energies involved in doing so are unachievable by current technologies (current particle accelerators can form such a plasma for very short periods of time and involve a very small amount of matter), and serve to highlight the impracticality of this setup (as alluded to in the title text). The energies would also result in formation of lepton pairs from energy, which is presumably where the electrons from the previous step ended up.<br />
|-<br />
|Hydrogenation<br />
|style="background:#FFFF9E;vertical-align:middle;text-align:{{{align|center}}};{{{style|}}}" class="table-yes"|Kinda<br />
|{{No}}<br />
|This process converts the quark-gluon plasma output in the previous step into elemental hydrogen, reversing the previous two steps. Presumably, this is done via {{w|hadronization}} and {{w|recombination}}; however, it is unclear how the {{w|baryon asymmetry}} needed to generate matter and not anti-matter is developed. The resulting hydrogen is split into 2 streams leading into the Nucleosynthesis and Reverse Electrolysis steps. In real life, {{w|hydrogenation}} is the process of adding hydrogen to unsaturated hydrocarbons. <br />
|-<br />
|Nucleosynthesis<br />
|{{No|Fake}}<br />
|{{No}}<br />
|Part of the hydrogen produced in the previous step is converted into oxygen via 2 sub-processes. The hydrogen is first converted into helium and carbon through a combination of the {{w|proton-proton chain}} and the {{w|CNO cycle}} as per the labels on the step. The helium and carbon are then converted into oxygen through the {{w|alpha process}}. This step may also involve the {{w|triple-alpha process}}, seeing that the alpha process is typically only applicable to converting carbon into heavier elements owing to the lack of a stable element with eight nucleons. These steps normally occur in the cores of massive stars. It is not known how the oxygen is filtered from the extremely hot plasma of fusion products.<br />
|-<br />
|Reverse Electrolysis<br />
|{{Yes|Real}}<br />
|{{No}}<br />
|This step is essentially a fuel cell, utilizing an electrochemical reaction to convert hydrogen and oxygen back into water and electricity.<br />
|-<br />
|Adding Well Water<br />
|{{Yes|Real}}<br />
|{{Yes}}<br />
|A second pipe is linked to the first that simply feeds untreated well water into the pipes, partially undoing the entire process. Even if the well water is only a small portion of the faucet water, its presence has now made the now incredibly pure water impure. This act of putting well water into the faucet after treating it may be a riff on the cultural interest in "spring water" or "pure glacial water" that is said to have additional minerals or beneficial properties but is oftentimes not meaningfully distinct from properly treated tap water. "Local minerals and probiotics added" may be a reference to Coke's "Dasani" brand drinking water, which is purified by reverse osmosis, and then has a package of minerals added to create the flavor (pure water's actual lack of flavor can be perceived as an unpleasantly 'flat' flavor).<br />
<br />
In addition, drinking only {{w|Tonicity|extremely hypotonic}} liquid intake can induce the body to expel more water than it took in (taking with it some essential minerals that are not being replaced) to try to maintain equilibrium of concentrations. This effect is not directly dangerous, but could exacerbate other bodily deficiencies in the long term and have the issues of greater than necessary liquid throughput than with 'normal' drinking water. The tendency for {{w|Sports drink#Categories|many 'sports' or 'health' drinks}} to hype the term 'isotonic' is based upon the idea that an ideal concentration of solutes can be added, in-between the opposing problems of having either too many ''or'' too few 'impurities'. The process does not include adding untreated (and probably also untested/unquantified) ground water, which could carry pathogenic organisms and chemicals, and appears to have no mechanism for ensuring what ''might'' be an acceptable level of re-blending for the circumstances.<br />
<br />
Alternatively, it may be that the level of purity achieved by this setup is so overkill, and the cost per liter processed so high, that it's simply more efficient to treat just enough of the water to dilute the rest of the water to acceptable levels of contaminants. For example, it's common to use a partial bypass to supply water to the shower, since shower water does not need to be potable. Also, some well water systems are clean enough to not need any treatment at all and can be used straight from the well, and some water systems are only slightly high in a single chemical contaminant that can be addressed by blending the water, either with treated water or another source (treated or untreated). Perhaps the treatment process led to enough radioactivity that blending with the original source was required to address radiological contamination (either gross alpha radiation or specific radionuclides).<br />
|}<br />
<br />
The title text briefly covers the cost implications of the components. Various 'real' filter elements will have material or energy costs or both, in operation or to replenish their effectiveness, and the high energy input needed to disassociate hadrons into raw quark–gluon plasma (at bulk levels) would seem to require the most in terms of running the equipment. But it is pointed out that to ''ensure'' enough cosmic rays reach that particular phase of sterilization, there would have to be a pipe (not shown) leading out to the edge of the atmosphere to optimistically carry down such particles (due to also containing ''no'' air, i.e., keeping it out to negate the normal {{w|Air shower (physics)|shielding and dissipating effect}} of the atmosphere on cosmic rays).<br />
<br />
Whether a one-off cost or needing regular replacement, the setting up of such a tubular structure (a vertical air-proof pipe perhaps somewhere between 100 and 10000 kilometers high) would be technically challenging and has not ever been actually accomplished. The conditions for a quark–gluon plasma, albeit in limited quantities, at least have been fulfilled at {{w|CERN}}, with its 27 kilometer airless pipe that goes round within a vast circular tunnel.<br />
<br />
==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
<br />
:[Header:]<br />
:How Water Filtration Works<br />
<br />
:[A system of various devices between water pipes is shown.]<br />
:[Input:]<br />
:Well water<br />
:[Labels of various devices:]<br />
:Water softener<br />
:Reverse osmosis<br />
:Ultraviolet sterilization<br />
:Autoclave<br />
:Condenser<br />
:Regular osmosis<br />
:X-ray sterilization<br />
:Carbon filter<br />
:Neutron source<br />
:Activated carbon filter<br />
:Gamma ray sterilization<br />
:Cosmic ray sterilization [On the device: "EeV γ"]<br />
:Electrolysis [H<sub>2</sub>O split into O and H]<br />
:Oxygen spallation [O becomes H]<br />
:Ionizer [H split into + and -]<br />
:Quark-gluon plasma chamber [+ and - become QGP]<br />
:Hydrogenation [QGP becomes H]<br />
:Nucleosynthesis [H goes through "P-P CNO" and becomes He and C, then through "Alpha" and becomes O]<br />
:Reverse electrolysis<br />
:[Output after devices:]<br />
:Pure water<br />
:[Second input, mixed with pure water:]<br />
:Well water<br />
:[Label:]<br />
:Local minerals and probiotics added for taste and to support immune health<br />
:[Final output:]<br />
:To faucet<br />
<br />
{{comic discussion}}<br />
<br />
[[Category:Chemistry]]<br />
[[Category:Physics]]<br />
[[Category:Engineering]]</div>FatPhilhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1000:_1000_Comics&diff=350305Talk:1000: 1000 Comics2024-09-11T09:28:32Z<p>FatPhil: what is a round number</p>
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<div>Cueball does not think in multiples of 2, he thinks in base 2 (or powers of 2). I fixed it. [[Special:Contributions/134.102.123.217|134.102.123.217]] 10:35, 10 September 2012 (UTC)<br />
<br />
In the original Blog format of this website, someone named Phillip had [http://www.explainxkcd.com/2012/01/06/1000-comics/#comment-19950 shared the following]: <br />
:"Spoiler ( https://rot13.com ): Pbaarpg gur ovanel ahzoref ba gur fznyy fvtaf va cnvag-ol-ahzoref znaare."<br />
Hint: copy/paste the weird looking text into the text field provided in the above mentioned website. Even after decryption, I couldn't follow what he meant, but I was hoping someone out there can do so and then explain it differently, thanks. It's a real mystery. [[User:DelendaEst|DelendaEst]] ([[User talk:DelendaEst|talk]]) 08:47, 22 September 2012 (UTC)<br />
: Added hidden image to Trivia section. --[[User:Bpothier|B. P.]] ([[User talk:Bpothier|talk]]) 11:06, 22 September 2012 (UTC)<br />
<br />
Just curious... The explanation says there are 1000 characters in the drawing. Are there 998 + Megan & Cueball? or do they make 1002? --[[User:Bpothier|B. P.]] ([[User talk:Bpothier|talk]]) 11:06, 22 September 2012 (UTC)<br />
<br />
: The transcript says "1000 characters ... are arranged to create the number "1000". Two more people stand in the foreground" so I think Megan & Cueball make it 1002. [[User:Coombeseh|Coombeseh]] ([[User talk:Coombeseh|talk]]) 10:56, 12 November 2012 (UTC)<br />
<br />
There's a WOPR machine saying "would you like to play a game?" [[Special:Contributions/116.76.165.167|116.76.165.167]] 05:51, 28 September 2012 (UTC)<br />
<br />
I noticed Barrel Boy isn't on here... [[User:Castriff|Jimmy C]] ([[User talk:Castriff|talk]]) 19:10, 31 October 2012 (UTC)<br />
: Barrel Boy is bottom right on the second "O", just above "WOOOO!" [[User:Coombeseh|Coombeseh]] ([[User talk:Coombeseh|talk]]) 10:56, 12 November 2012 (UTC)<br />
<br />
Well about what cueball says another interesting fact is that the number 1024 is used commonly in computer data, 1024 megabytes makes a gigabyte and so on...<br />
<br />
:So, has anyone noticed that this wasn't actually Randall's thousandth comic, but rather his 999th? [[User:Schiffy|Schiffy]] ([[User talk:Schiffy|talk]]) 16:44, 12 March 2013 (UTC)<br />
::Is there a numbered comic that was omitted?[[Special:Contributions/74.213.186.41|74.213.186.41]] 13:10, 1 April 2013 (UTC)<br />
:::Yes, comic 404 never existed, remember? [[User:Schiffy|Schiffy]] ([[User talk:Schiffy|talk]]) 17:04, 9 April 2013 (UTC)<br />
::::Comic 404 was "Journal 3". [[Special:Contributions/121.54.48.38|121.54.48.38]] 04:24, 12 May 2013 (UTC)<br />
:::::Or maybe Comic 404 DID exist, However was left behind within the bowels of abandoned comics... Never got into xkcd to fill the gap... Because it's place was replaced with the 404 page. [[Special:Contributions/121.54.48.38|121.54.48.38]] 04:25, 12 May 2013 (UTC)<br />
:::::: Well, All hope is no use, I googled up "xkcd 404" and it gave no results about a 404th comic ever existed, Nor "xkcd no 404" or "xkcd's 404th comic", I guess we have to discuss about this in here: http://forums.xkcd.com/viewtopic.php?f=7&t=80760 [[Special:Contributions/121.54.48.38|121.54.48.38]] 04:29, 12 May 2013 (UTC)<br />
:::::::Even this very site shows that Comic 404 never existed. Comic 403 was on a Monday, and 405 was the following Wednesday. The day in between those two (the Tuesday of that week) was April 1st. For further proof, see [http://xkcd.com/404 here]. [[User:Schiffy|<font color="000999">Schiffy</font>]] ([[User_talk:Schiffy|<font color="FF6600">Speak to me</font>]]|[[Special:Contributions/Schiffy|<font color="FF0000">What I've done</font>]]) 17:39, 17 May 2013 (UTC)<br />
::::::::Hey, that's the April's fool from 2008. The 404 message is from Randall!!! Check the page source: [http://xkcd.com/404/ April, 1]--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 18:51, 17 May 2013 (UTC)<br />
:::::::::Not quite true. See link -> [http://comicjk.com/comic.php/404] {{unsigned ip|108.162.245.57}}<br />
::::::::::Hi IP 108.162.245.57, your link shows a comic not done by [[Randall]]. The 404 page is just empty and that's the joke. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 20:03, 5 August 2014 (UTC)<br />
:::::::::::And since this discussion [[404]] has been created on this page as well. {{unsigned|Kynde}}<br />
Aha the amount of references to lots of different comics is amazing! [[User:Nyx goddess|Nyx goddess]] ([[User talk:Nyx goddess|talk]]) 00:44, 11 December 2018 (UTC)<br />
:(Moved the comment)[[User:Nyx goddess|Nyx goddess]] ([[User talk:Nyx goddess|talk]]) 00:45, 11 December 2018 (UTC)<br />
<br />
;The "1000 Characters" section<br />
I really don't see why it should be there. [[Special:Contributions/108.162.216.71|108.162.216.71]] 03:43, 8 January 2014 (UTC)<br />
:I did remove this. All the 1,000 comics are explained here very well. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 20:34, 8 January 2014 (UTC)<br />
::I think we are missing out on this section. I would like to have a separate page for this as we have for other larger comics. And also a separate transcript with the text that can be read on the large picture. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 21:24, 9 May 2015 (UTC)<br />
:::And now it is being created, and categories belonging to this comic is being added. This makes sense comparing with all other large comics explanation pages. It is relevant to know that there are also hamster ball, boomerangs, kites, Richard Stallman and Star Wars lightsabers etc. But it's a huge work and it is not yet complete... To make it possible [[1000: 1000 Comics/Numbered images|a numbered image]] has been created and the [[1000: 1000 Comics/1000 characters|table with description of all 1000 characters]] are in progress. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 15:10, 13 August 2016 (UTC)<br />
<br />
Cipher text: CONNECT THE BINARY NUMBERS ON THE SMALL SIGNS IN PAINT-BY-NUMBERS MANNER [[User:Jwoodward48xkcd|Jwoodward48xkcd]] ([[User talk:Jwoodward48xkcd|talk]])<br />
<br />
<br />
Following with this wiki's goal of explaining the nuances of the XKCD comics I moved the connect the dots puzzle out of trivia and placed it int the main article. It isn't a spoiler or just trivia, it fits well with the title text and is definitely not something a casual reader would find on the first pass through the comic. [[User:Chriswampler|Chriswampler]] ([[User talk:Chriswampler|talk]]) 13:13, 5 May 2014 (UTC)<br />
<br />
Why is this still Incomplete? Unless someone wants to catalog all 1000 characters, there's not much left to do.<br />
[[Special:Contributions/173.245.55.83|173.245.55.83]] 17:34, 14 May 2014 (UTC)<br />
:Well there is someone who wish to do that, and it is happening right now. So that's why it is incomplete (again) now. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 15:10, 13 August 2016 (UTC)<br />
<br />
Useless fact: 1024 is also a round number in base 4 and base 32. {{unsigned ip|173.245.49.108}}<br />
<br />
The mathematical definition of a round number is not dependent on a "base", but upon the prime factors of the number; i.e., all prime factors must be less than the square root of the number. Thus, 1000 is round because its prime factors are 2 and 5 which are under 32 and so is 1024 which has only the prime factor of 2.--DrMath 07:15, 17 February 2015 (UTC)<br />
:That is not the mathematical definition. Your definition would make 10 not a round number, but 161803398 and 161803398874 round numbers. Whether a number is round is intimately related to the represention of that number in specific bases. The more trailing zeroes, preferably all but one or two, the rounder the number is. The wikipedia page on this topic even uses 1024 as an example how numbers may be round in one base, but not others. [[User:FatPhil|FatPhil]] ([[User talk:FatPhil|talk]]) 09:28, 11 September 2024 (UTC)<br />
<br />
;Celebrations<br />
<br />
MIT hackers commemorated [[1000]] by posting all xkcd comics ever published around Lobby 7, a high traffic entryway near 77 Mass Ave. The comics were attached to both pillars and walls (using easily removable adhesive so as to avoid damaging the walls). http://hacks.mit.edu/Hacks/by_year/2012/xkcd_1000/ [[User:Tericee|Tericee]] ([[User talk:Tericee|talk]]) 20:32, 4 August 2015 (UTC)<br />
:… sadly they misspelled his last name as “Monroe” on the page that you linked to. --[[Special:Contributions/162.158.114.229|162.158.114.229]] 22:32, 1 March 2016 (UTC)<br />
<br />
I'm disappointed. There is no Darth Vader and not a single raptor in this drawing :( {{unsigned ip|162.158.86.59}}<br />
:But a lightsaber and a squirrel can be found though ;-) --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 15:10, 13 August 2016 (UTC)</div>FatPhil