explain xkcd - User contributions [en]

Talk:2566: Decorative Constants

2022-01-12T08:07:05Z

Lev: How is their being unitless relevant?

I don't have any idea what to put in the actual description, but whoever does should probably note that r(in) - r(out) equals zero, not one. And multiplying by a constant 0 absolutely changes the value! [[User:GreatWyrmGold|GreatWyrmGold]] ([[User talk:GreatWyrmGold|talk]]) 21:59, 10 January 2022 (UTC)
: rout and rin are different values. The subscripts represent different instances of the same variable at different point. In the same way, you might calculate something happening over a time interval tend - tstart . [[Special:Contributions/172.69.71.77|172.69.71.77]] 23:02, 10 January 2022 (UTC)
::Yes for sure they are two different values. On the other hand if μ is not 1 then the it is not just decorative! D on the other hand is just a proportionality constant, which may have a value other than 1. I have tried to put something in the explanation here. Quite a bit. Do not really now anything about Drag, so just took it from the wiki page. Also I hope someone can explain the formula in the image, as I'm sure it is just something about the flow, that would relate it to a drag equation. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 23:41, 10 January 2022 (UTC)

Note that the title text is pretty much word-for-word a repeat from Randall's book *How To*. In Chapter 11: *How to Play Football*, he misuses the drag equation, and mentions this fact in more depth, in a footnote. Bit of trivia! --[[Special:Contributions/162.158.134.79|162.158.134.79]] 23:13, 10 January 2022 (UTC)
:Nice, I will have to check up on that. Thanks. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 23:41, 10 January 2022 (UTC)
:Can confirm this, the book mentions that the "traditional tribute to Euler and Bernoulli" comes from Frank White's ''Fluid Mechanics'' textbook. [[User:Clam|Clam]] ([[User talk:Clam|talk]]) 01:08, 11 January 2022 (UTC)
:: There it is, page 266 in the 1986 2nd edition: "They both have a factor ½ as a traditional tribute to Bernoulli and Euler, and both are based on the projected area..." https://books.google.com/books?id=wGweAQAAIAAJ&q=traditional -- [[Special:Contributions/172.70.162.5|172.70.162.5]] 02:13, 11 January 2022 (UTC)
:::Great thanks have included both references in the explanation. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:32, 11 January 2022 (UTC)
:Wait, wouldn't the values be twice as big (rather than half as big) if you left off the 1/2? [[Special:Contributions/141.101.69.154|141.101.69.154]] 12:43, 11 January 2022 (UTC)

Of course, the c^2 im e=mc^2 is just as decorative, when using natural units where c=1.... [[Special:Contributions/172.68.50.171|172.68.50.171]] 00:29, 11 January 2022 (UTC)
: And the resulting equation is then just e=m - or m=e which is beautiful and profound. "Mass is Energy". Without the complications, you stop thinking of it as a PROCESS for converting one into the other and get the more profound point that Mass and Energy are the exact same thing. [[User:SteveBaker|SteveBaker]] ([[User talk:SteveBaker|talk]]) 03:33, 11 January 2022 (UTC)

I think the 1/2 in the drag equation is intuitive. I understand that it is technically superfluous, but F=Pd*A and Pd=1/2*rho*u^2 so the 1/2 carries over intuitively.

Drag coefficients could just as easily be half as big. This is true but how is their being unitless relevant? It's more about how defining constants is partially arbitrary. [[User:Lev|Lev]] ([[User talk:Lev|talk]]) 08:07, 12 January 2022 (UTC)

==Count down clock==
;Keep discussion of comic above this, and further discussion of countdown here below!!!
Any idea what's going on with the clock that's counting downwards in the banner? Currently counting down from 20 days 16 hours? [[Special:Contributions/172.70.214.95|172.70.214.95]] 22:08, 10 January 2022 (UTC)
:(Simultaneous edit) What is the days-hours-minutes in the box above the comic referring to? The image itself is dated yesterday, as you can see by saving it. Worst-case-scenario, is this a countdown to the end of XKCD? [[Special:Contributions/108.162.245.223|108.162.245.223]] 22:11, 10 January 2022 (UTC)
:: It's going to hit zero at around midnight on Jan 31st 2022 CST? [[User:SteveBaker|SteveBaker]] ([[User talk:SteveBaker|talk]]) 22:16, 10 January 2022 (UTC)
:::'''Posted [[Talk:2565:_Latency#Countdown|this]] on the previous comics discussion. But lets take it here where there will be more traffic:''' --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 22:44, 10 January 2022 (UTC) -- Copy paste from previous comics discussion:
::::Damn you beat me to it ;-). But I have made a [[2565:_Latency#Trivia|Trivia]] here on this comics page and links to more detail on the [[xkcd Header text]] page. I believe you are a day of, but someone will likely correct me if I'm wrong. As I can see it will be January 31st, 9:59 in Randall's home town Boston.--[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 20:06, 10 January 2022 (UTC)
:::::But damned if I can wait. Sure millions will watch the page when it goes to zero! At least it is no April 1st. :-D --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 20:10, 10 January 2022 (UTC)
::::Yeah - you're right - I messed up. So as I type this, it's Jan 10th 2022 at 4pm - 1600 hrs Mountain time - which is 1800 hours EST. At this moment, the countdown reads 20d 16h 0m - so Jan 30th + (18+16) hours = which is Jan 30th + 34 hours - which is Jan 31st + 10am in Boston (EST). [[User:SteveBaker|SteveBaker]] ([[User talk:SteveBaker|talk]]) 23:05, 10 January 2022 (UTC)
:::::Hey great, can see they agree in the link to reddit below. So happy I got it right both in UTC and Boston. It will be 15:59 here in DK. Not 16:00. ;-) --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 23:44, 10 January 2022 (UTC)

Counting down to Backwards Day? --[[Special:Contributions/162.158.91.88|162.158.91.88]] 23:28, 10 January 2022 (UTC)
:There's a reddit thread discussing it: https://www.reddit.com/r/xkcd/comments/s0oynl/xkcd_countdown_timer_20d_21h_49m_remaining_until/ I think the most likely guess is that Randall has a new book coming out. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 23:40, 10 January 2022 (UTC)
::Would still seem strange if it came out that day with only promotion before being a count down. But then again, he will have the xkcd communities boiling if he gives no other hint. So every one will see if he promotes a book. Also as they wrote at the time I looked at reddit I do not think it is the end of xkcd, or Webb related. Although Webb was the first I thought about. But I mean even if it came to L2 at that day, it is not going to any specific point but just in orbit. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 23:47, 10 January 2022 (UTC)

::The date fits the idea of it being Backwards Day (https://nationaldaycalendar.com/backward-day-january-31) but what about the choice of time? [[User:SteveBaker|SteveBaker]] ([[User talk:SteveBaker|talk]]) 03:38, 11 January 2022 (UTC)
:::Backwards day... Never head of it until now. Is it big in the US. I mean when looking after dates so obscure they are not mentioned on wikipedia then there are probably lots of things happening on that day? But maybe it is a think in the US? --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:48, 11 January 2022 (UTC)
:::: I haven't heard of it until now either, so it is probably one of the bajillions of holidays no one actually cares about, and is unrelated to the countdown. [[Special:Contributions/108.162.221.163|108.162.221.163]] 13:22, 11 January 2022 (UTC)Bumpf

Someone has noticed the image is changing with pixels added at the bottom left corner and is keeping track of it here: https://munvoseli.github.io/xkcd-countdown/ [[Special:Contributions/198.41.238.107|198.41.238.107]] 05:49, 11 January 2022 (UTC)
:Looks like an image is "moving" into the frame because at the moment you can see some white pixel in the lower left, i.e. the black part might end up as a line as part of some comic. [[Special:Contributions/162.158.89.8|162.158.89.8]] 08:31, 11 January 2022 (UTC)
::Thanks used that to pinpoint the start of the countdown. Have added this info to the header text page, and the original trivia. Also just added a line of trivia to this explanation with the link. This was when this comic came out most people noticed the count down. But it did came out while [[Latency]] was up. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:43, 11 January 2022 (UTC)
:::Speculating on what it could be, the only thing that makes sense at that angle is a character's arm. 04:47, 12 January 2022 (UTC)

The header changes page says that it's forcing "Friday" to move down to the next line. Not for me. Did he fix it, or is it browser-specific? [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 14:58, 11 January 2022 (UTC)

This is much more likely a count down related to the James Webb Space Telescope. At approximately the day the count down indicates the telescope will be orbiting the L2 gravitational spot.Perhaps most of the mirrors will be approximate place to allow for months of fine tuning. An example of a slightly similar idea is https://www.space.com/nasa-james-webb-space-telescope-next-steps
[[User:Punchcard|Punchcard]] ([[User talk:Punchcard|talk]]) 15:35, 11 January 2022 (UTC)

I think the Countdown should get its own entry. What do we think? [[User:Sure|Sure]] ([[User talk:Sure|talk]]) 16:25, 11 January 2022 (UTC)
: I think it should! What with the count itself, the speculation about what it could mean, and now the slowly arriving image (?) this seems like something beyond either of the two comics since it started! [[Special:Contributions/108.162.219.49|108.162.219.49]] 18:00, 11 January 2022 (UTC)
: I'm surprised it doesn't have one already. This is one of the more unique situations in a long while, more speculation could happen. [[User:Thisfox|Thisfox]] ([[User talk:Thisfox|talk]]) 22:26, 11 January 2022 (UTC)

If you take a look at this [[https://xkcd.com/count-wimRikmef/state|link]] it displays this: '''{"img":"72cb154b23f959f908f5dc8eb03069c6df3f0f54aae896a0e7ed27befb2ee639.png","start":"2022-01-10T17:00:00Z","target":"2022-01-31T15:00:00Z","until":"2022-01-11T20:55:38.205303701Z"}''' [[User:Hoodiesandboba|Hoodiesandboba]] ([[User talk:Hoodiesandboba|talk]]) 20:58, 11 January 2022 (UTC)
:To correct your link:
:"...If you take a look at this [https://xkcd.com/count-wimRikmef/state link] it displays..."
:As to where the "72cb154b23f959f908f5dc8eb03069c6df3f0f54aae896a0e7ed27befb2ee639.png" is rooted, I haven't dug into that (or what transforms might be being applied), but it looks like a manipulation of browser states might be able to prematurely reveal it. (I'm on mobile at the moment, and it's significantly more fiddly to poke into the page-scripting and markup than I can be bothered with this moment, but I know what I'd do with a good acreage of screen, mouse control and a proper keyboard to rattle away at. And the combined minds here surely can do even better than myself.) [[Special:Contributions/172.70.91.116|172.70.91.116]] 22:38, 11 January 2022 (UTC)

I think it counts down to Lunar New Year (the Year of the Tiger), as measured in Korea (the earliest timezone where that is celebrated). Actually, it reaches 0 one minute before the New Year, so maybe it will switch to seconds for the last minute. [[Special:Contributions/172.70.98.75|172.70.98.75]] 05:10, 12 January 2022 (UTC)

Talk:2288: Collector's Edition

2020-04-03T08:02:22Z

Lev:

... is this going to be like [[1190: Time]]? [[Special:Contributions/162.158.74.63|162.158.74.63]] 04:08, 3 April 2020 (UTC)
: I hope so, otherwise I don't get the joke [[User:Forresthopkinsa|Forresthopkinsa]] ([[User talk:Forresthopkinsa|talk]]) 04:15, 3 April 2020 (UTC)
: The page just went down for me so maybe what we've seen isn't what it's supposed to be? [[User:Avi m|avis_magpie]] ([[User talk:Avi m|talk]]) 04:20, 3 April 2020 (UTC)
Looks like the whole comic was just taken down. [[User:Parzivail|Parzivail]] ([[User talk:Parzivail|talk]]) 04:27, 3 April 2020 (UTC)
: Can confirm - the most recent comic is Pathogen again [[Special:Contributions/162.158.187.207|162.158.187.207]] 04:26, 3 April 2020 (UTC)
It is still up on the mobile website, but only if you directly go to comic page https://m.xkcd.com/2288 [[Special:Contributions/172.69.22.146|172.69.22.146]] 05:10, 3 April 2020 (UTC)
: Perhaps this is a collector's edition because it was only up for a limited amount of time? {{unsigned ip|108.162.219.60|05:12, 3 April 2020}}
:: That was my immediate assumption. The title text says, "I'm sure you can find some suitable worldbuilding material if you scavenge through the archives." And I was viewing the comic by using the Internet Archive's Wayback Machine — which, wouldn't you know it, captured the page exactly once before it went down. Between that and the title "Collector's Edition", I can't help thinking that the comic was actually intended to be viewed this way. Though for what reason, and what intended meaning, I couldn't tell you. …And jeez, in the time it took me to type this, the comic is back, but changed! Oy vey. [[User:NoriMori|NoriMori]] ([[User talk:NoriMori|talk]]) 06:42, 3 April 2020 (UTC)

Maybe it's called collectors edition, because it was only available quite limited and to an unusual time? But that logic doesn't fit with the title text. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 05:14, 3 April 2020 (UTC)
:I doubt that could be caused by "technical difficulties". [[Special:Contributions/172.69.34.186|172.69.34.186]] 06:14, 3 April 2020 (UTC)

It looks like it went back up about 5 minutes age. I can't figure out if it's possible to do more than pan right now though. [[Special:Contributions/108.162.215.120|108.162.215.120]] 06:39, 3 April 2020 (UTC)
:Yeah I see the same thing, looks like they're just testing it live. What a shame :(--[[Special:Contributions/108.162.215.242|108.162.215.242]] 06:47, 3 April 2020 (UTC)
::what makes you assume that this is testing right now? however it doesn't seem to be very interactive apart from panning through it, and that it seems to chagne over time (the moon from [[1300]] wasn't there a few minutes ago, was it? --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 06:49, 3 April 2020 (UTC)

:It's a giant pan similar to [https://xkcd.com/1110], although it's mostly empty, with some content at [https://xkcd.com/2288/#-361,-161]
. The title reads that you can find world building material, if you scavenge through the archives. I assume, more content will be unlocked as you read through past comics. [[User:Goatfryed|Goatfryed]] ([[User talk:Goatfryed|talk]]) 06:52, 3 April 2020 (UTC)
::That would mean it is individual? That everyone gets their own picture? --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:03, 3 April 2020 (UTC) Edit: I can kinda rule that out. I get the same picture on my phone and my work laptop, the work laptop is in a different country via vpn, and doesn't share any logins/advertisement ID's apart from explain xkcd with my phone... --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:05, 3 April 2020 (UTC)

Yeah, it definitely changes. The orange swimming pool just showed up now. Also, at the bottom of the page, it says something about "backpack", and what appears to be a reference to some other xkcd comic. For example, "Hint: why waste time say few word when lot word do trick", which I think refers to Up Goer Five. But I have no idea what to do with that info. [[Special:Contributions/172.68.141.190|172.68.141.190]] 06:55, 3 April 2020 (UTC)
:and the content seems to be related to previous comics and what-ifs... but still no clue what to do apart from exploring the page. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 06:57, 3 April 2020 (UTC)

So I just stumbled upon this and it seems to be exactly as other commentors have theorised: as you read previous comics more stuff gets added to the page. There seems to be some kind of backpack mechanic where you collect items from previous ones somehow, but, perhaps because I've already read all previous comics, that didn't seem to work for me. Instead I just had to click the link above the backpack, which opened the comic in a new tab, and it had a bunch of stuff there. We may need to co-ordinate to figure out if different people end up with different sets of items, and to ensure we have all of them, but I think other than that it should be just a cut and dry thing of making a table with every item in it. [[Special:Contributions/162.158.34.202|162.158.34.202]] 07:12, 3 April 2020 (UTC)
:Hang on, mine just changed: before there was only 1 pool on the left, now there are two. I only went back to pathogens and then forwards agin. This may be harder than I thought, I'm going to start keeping a screenshot log of actions vs. results. [[User:Benkor42|Benkor42]] ([[User talk:Benkor42|talk]]) 07:17, 3 April 2020 (UTC)
:You may need to try xkcd.com instead of www.xkcd.com - there seems to be an issue with the latter at the moment. [[Special:Contributions/162.158.255.216|162.158.255.216]] 07:18, 3 April 2020 (UTC)
::Hold up it changed again! This time without a reload! [[User:Benkor42|Benkor42]] ([[User talk:Benkor42|talk]]) 07:28, 3 April 2020 (UTC)
:::It seems to change periodically, the url does change everytime. New stuff always seems to be added, not old stuff rremoved. [[User:Benkor42|Benkor42]] ([[User talk:Benkor42|talk]]) 07:28, 3 April 2020 (UTC)
::::The URL is related to the coordinates, it changes when you pan the image. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:34, 3 April 2020 (UTC)
::::Timings seem to be random, working on double checking that rn. Highest first number so far is 1127, once it switches agin I'm going to experiement with manually editing the url.

I was briefly able to do things. Open the archieve, navigate it to one of the comics, that are hinted for (e.g. compiling or iata) and when viewing that comic I get a lootbox, with an image I can then place in the 2288. It worked twice, and now it doesn't again... neither with those that have worked before, nor with others I am fairly sure have been placed by other people. (such as galilean moons) --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:21, 3 April 2020 (UTC)
:I'm working on assembling an image log, wonder if we could compare? Also, the two number url could be useful, rn I'm on -1378, -152 [[User:Benkor42|Benkor42]] ([[User talk:Benkor42|talk]]) 07:25, 3 April 2020 (UTC)
::What do you mean by compare? Also the URL is related to the coordinates, it changes when you pan the image. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:34, 3 April 2020 (UTC)
:::Yh just got that, is that the same for other panning comics (I'm a little new)? And I was wondering if the comic changed per person/system like certain previous comics. [[User:Benkor42|Benkor42]] ([[User talk:Benkor42|talk]]) 07:40, 3 April 2020 (UTC)
::::Just seen a previous comment from you saying it doesn't change cross-system. However, it definetely changes with time, so the question is whether that's per user or done on a sort of universal clock, so we all unlock the same new content at the same time.
:::::I didn't complete writing up the thing I was able to do above... after opening the lootbox I got one image related to the comic I opened in my backpack and was able to place that in the actual 2288, where it now is placed. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:50, 3 April 2020 (UTC)
::::::For me that didn't happen, it started with a loading screen type thing, and then objects just started appearing seemingly at random. I've also noticed some of them dissapear. I feel like the best course of action would be to start with a table of all the different objects, and then see if we can figure out when/why they appear later.
::::::: At least 2 objects appeared, because I placed them. It is a colaboration of many xkcd readers to do this world building here. I placed one of the sword fights around #439,-181 and the non-inverted kite at #-1679,-290 . --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:55, 3 April 2020 (UTC)
:::::I think we can unlock new elements by reading older comics (seemingly at random, it doesn't work with every comic read) and that everyone can see the changes once they are put on the global picture. If someone could check, I have put berret guy and his goat around (5000,0)
::::::Yep, he's there. [[User:Benkor42|Benkor42]] ([[User talk:Benkor42|talk]]) 08:01, 3 April 2020 (UTC)

I almost feel like someone needs to show them this xkcd... https://xkcd.com/169/

It seems to be an interactive canvas. You can find stickers in chests on specific comics and put them in your backpack, and then when you come back here you can choose where to put them on the canvas. The hints in the empty backpack are cryptic references to comics. {{unsigned ip|162.158.107.85}}
:Yep, I figured the same thing, but for me it only worked twice (fly from wtf to lol was a reference to the iata thing and compiling was a reference to the compiling one) - but it didn't work again. Also: Some of the placed images are clearly references to what-if. Like the squirrel on top of an AK47 or the yoda powering an IPOD. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:59, 3 April 2020 (UTC)

I've made a catalog of the stickers but it's only partial because stuff keeps appearing: https://photos.app.goo.gl/dPYeYVpGqu5tqGTt5 [[User:Lev|Lev]] ([[User talk:Lev|talk]]) 08:02, 3 April 2020 (UTC)

2288: Collector's Edition

2020-04-03T07:57:53Z

Lev: First explanation.

{{comic
| number = 2288
| date = April 3, 2020
| title = Collectors Edition
| image = collectors_edition.png
| titletext = I'm sure you can find some suitable worldbuilding material if you scavenge through the archives.
}}

==Explanation==
{{incomplete|Created by TECHNICAL DIFFICULTIES. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}

This is an April 1st comic. It is a large image, of which only part is visible, but it can be dragged around. The large image contains a collection of items, sometimes humorous, often repeating. Items keep appearing in real time. They are not random: they are the same for all viewers of the page at the same time.

There is a "backpack" at the bottom, similar to "backpacks" in video games containing items collected by the player. However, it's not clear how to gather the items.

<blockquote>
Note: For technical reasons Wednesday's comic will be posted Thursday instead. Apologies for the delay!
</blockquote>

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Cueball stands to the left of a vibrating box.]
:[The words "Collector's Edition" are written above him and boxed.]

{{comic discussion}}