explain xkcd - User contributions [en]

Talk:2832: Urban Planning Opinion Progression

2023-09-24T22:22:28Z

162.158.74.96: Undo revision 324293 by JohnHawkinson (talk) Un'subst' what needn't have been subst. Plus answer the Edit Summary question by the same individual who originally {{unsigned}} it...

Why does anyone want their city to be walkable? We have buses, Uber, and subways, so why walk anywhere other than to/from the station? [[User:SDSpivey|SDSpivey]] ([[User talk:SDSpivey|talk]]) 18:34, 24 September 2023 (UTC)

Somebody has been watching Not Just Bikes on YouTube...
:Orange Pilled!!🙂 [[User:Torzsmokus|Torzsmokus]] ([[User talk:Torzsmokus|talk]]) 19:43, 23 September 2023 (UTC)

I would be very interested in having a discussion based on the "livability" comment. If a city is a place to LIVE, then these are fair comments, assuming that travel outside the local area is minimal. But if a city is a place to WORK, like a lot of downtown areas in the Eastern US, then this doesn't hold up as well. People don't live in these areas, they just travel to them on a regular basis.
:Talk about missing the forest for the trees
:Agree, downtown areas SHOULD be places to work, live, shop, and play. Eastern US downtowns USED to be that way, until White Flight screwed everything up and created "car culture". It's long past due for cities to change back. - [[User:Frankie|Frankie]] ([[User talk:Frankie|talk]]) 15:59, 23 September 2023 (UTC)
::You can't really blame white flight considering the same thing happened in both 'racially homogenous' cities in the U.S. and in Canada. [[Special:Contributions/172.70.174.251|172.70.174.251]] 17:22, 23 September 2023 (UTC)
: One thing that always bugs me about these discussions is that they tend to be so city-centric in thinking. Bikes simply aren't a practical mode of transportation in a lot of areas, dating back to pre-car days. I live in a rural area of the southern midwest, and "town" is a concentration of places that people in the area go to, and always has been. Only really wealthy people had houses in town, and even then they were often "Sunday Houses" where you would stay during your weekend trip to town for groceries and church BECAUSE it was such a hassle before cars. There's a "historic" (read: tourist-friendly) walkable town square in the center of many towns in my area, but these are as a rule businesses, some of which have loft apartments because the owner lived there too as some of the town's few constant residents. Even the parking lots are basically paved versions of the spaces where people would park their wagons and tie their horses back in the day, placed near things like general stores because hauling groceries for several blocks is a pain in any era. [[User:Scorpion451|Scorpion451]] ([[User talk:Scorpion451|talk]]) 18:59, 23 September 2023 (UTC)
:: I've never really lived in small towns on this side of the world, but this video does a pretty good job on approaching urbanism from a rural perspective: https://www.youtube.com/watch?v=mKRr8ymaqBM [[User:Yaygya|Yaygya]] ([[User talk:Yaygya|talk]]) 23:38, 23 September 2023 (UTC)
:: More generally, it's not really a useful, meaningful, or fair comparison between a densely populated country like the Netherlands (>1000/mi*mi) and a sparsely populated country like the USA (<100/mi*mi). All the USA's wide-open spaces are the actual physical reason we have a "car culture". It's not just people being deliberately being stupid or something. [[Special:Contributions/172.71.222.237|172.71.222.237]] 01:24, 24 September 2023 (UTC)
::: People aren't evenly spread over the US though, and nobody commutes from LA to NYC. 80% of people in the US live in cities. [[Special:Contributions/172.71.182.2|172.71.182.2]] 16:24, 24 September 2023 (UTC)

:Places meant for work and work alone are called 'industrial parks'. People's well-being in offices can significantly benefit from green spaces and other amenities like bars and shops.
:Especially if they feel safe walking to and from those shops. --[[User:Melle|Melle]] ([[User talk:Melle|talk]]) 16:54, 23 September 2023 (UTC)
:: Honestly, what impresses me the most about the Netherlands is not their neighbourhoods or city centres, it's their industrial parks. Dutch industrial parks are so much nicer it's not even funny. https://www.youtube.com/watch?v=SDXB0CY2tSQ [[User:Yaygya|Yaygya]] ([[User talk:Yaygya|talk]]) 23:38, 23 September 2023 (UTC)

The explainxkcd explanations have gotten kinda funny, but I wanted to add that some european cities have sidewalks wider than roads, and it’s a much different experience. People like openness. [[Special:Contributions/162.158.62.55|162.158.62.55]] 17:46, 23 September 2023 (UTC)

Honestly, I do not know how to format it, however this is the citation about painted vs protected bike lanes: https://www.sciencedirect.com/science/article/abs/pii/S2214140523001056?dgcid=author [[User:Vdm|Vdm]] ([[User talk:Vdm|talk]]) 21:44, 23 September 2023 (UTC)

Yes, cities are much better place to live in without so many cars. But on the other hand, vacation without car is much more complicated, unless your idea of vacation is to get to exactly same place as everyone else. Soo ... where will all those cars go? I know, you could rent a car, but that only works if there wouldn't be times where EVERYONE suddenly needs car ... like, say, Christmas.

Also, no, bikes are not alternative to cars unless you can get shower when you arrive at work. Public transport could work, but bikes are just nice theory.

To conclude, I don't think trying to turn all cities into Amsterdam will work. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:07, 23 September 2023 (UTC)
: Bikes are an incredibly helpful and useful tool for getting around. You don't even have to turn a city into Amsterdam. I live in Edmonton, which is by no means an urbanist utopia, and even getting around here, combining a bicycle with public transit makes it so much easier and faster to get around. The issue I face is lugging my bike with me, in which case a bike share service like Montréal's BIXI would help out for getting around.
: Regarding your point on vacation, first of all, most people end up going to the same places for vacation anyway. And vacation without bringing a car can very much be done, and even at high-demand times, the places where "everyone needs a car" are places where everyone will be going anyway, at which point a train just makes more sense. About a decade ago, my family took a trip from New Delhi to Goa a decade back (around 1800 km away) and we took trains to get there. We rented a car to get around in Goa and it worked pretty well. Not saying that cars aren't useful at all, but they aren't a 100% necessity. They're most useful when you're heading somewhere that's out of the way, and I've done those sorts of trips too. [[User:Yaygya|Yaygya]] ([[User talk:Yaygya|talk]]) 23:38, 23 September 2023 (UTC)

"...by allowing cyclists to cycle in the streets with the cars". ''Allowing''? Sorry, but that's a very neo-biker (or "person on a bike", rather than an actual cyclist) attitude that unfortunately seems to pervade the mindset of drivers. At least in the UK, bicycles have been 'allowed' (indeed, obliged) to ride upon the roads, as of laws as far back as [http://www.legislation.gov.uk/ukpga/Will4/5-6/50/section/72 1885] and are legitimate road vehicles and also not supposed to be ridden on actual pavements(/sidewalks) where not explicitly allowed. Of course, the US has policies driven (c.f. jaywalking). But a bicycle is a road vehicle. Add extra permissive routes (in the same manner as allowing traffic of less than three tonnes over a bridge, without forcing everything within that limit to do so) but you'd be wrong to suggest, over here, that you'd have to ''allow'' cyclists to cycle in(/on) the streets. Though the modern 'MAMILs' are often as wrong about all this (and as damaging to the reputation of real cyclists) as far too many motorists are. Of course, this may not reflect the US situation (or state/township legislations), but then they were influenced by the car-lobby to create the jaywalking 'crime' as well, so I really wouldn't be surprised. [[Special:Contributions/162.158.74.62|162.158.74.62]] 22:16, 23 September 2023 (UTC)

I went to the Netherlands on vacation last month and I strongly identify with the guy waving flags and yelling "Netherlands! Netherlands! Netherlands!" in this comic. I was in Rotterdam, not Amsterdam, but I also spent a day in Enschede (near the border with Germany), and the sight was the same: bicycles everywhere, to a degree that would seem absurd anywhere else. I don't think it can be properly expressed in words; one look at the bicycle parking in Rotterdam Central Station and I was in awe that _so many bicycles_ could exist in one place. I used a bicycle to explore from The Haag to Neetle Jans and everywhere I went it was the same story; it isn't just Amsterdam, the entire country is built with bicycles as a solid and safe transportation option. --Faultline 11:32, 24 September 2023 (UTC)

Speaking from the perspective of the UK, Cyclists (and I speak as one, with six decades of experience) are a complex issue. Being road vehicles (and requiring continuous at-grade surfaces, or at least smoothly transitioning slopes, whilst mounted) they need special consideration when laying out where they can go, outwith the baseline highway planning situation. And they also pose difficulties if improperly ridden in pedestrian areas, even if this is somehow due to being 'forced'(/’invited') off the roads by motorists and/or town planners that are in turn posing difficulties to them (legislatively, physically or just psychologically). In an ideal world, there would be no need for cycle lanes (on road), let alone cycle paths (split or shared pavement/sidewalk). And as it is not possible to have cycle-segregation everywhere (ignoring the question of whether forced segregation is a good policy!), I feel that attempting to take bicycles (or indeed other types of cycle!) off the road where it is easy and/or virtue-signalling makes the roads worse for cyclists ''everywhere else''. (And also the pavements worse for pedestrians, everywhere else!) 
There are (according to a quick check) 262,300 miles of paved road in the UK. Apart from the motorways (2,300 miles) and a smattering of other "no cycling" roads (often "motorway standard link roads" or major bridges), all of these are viable cycling routes. Maybe you'd not feel safe on some other routes (mostly a problem stemming from motorists, not the highways), so call it a cool quarter of a million miles. Compare with (again, a quick and unconfirmed check) the apparently 5,220 miles of traffic-free cycle paths (some 'cross country', bridleways/ex-railway/etc, others directly parallel to 'bike unfriendly/hostile/illegal' roadways) and 7,519 miles of on-road cycle lanes (paint and/or bollard-segregated, and I assume this includes bike+bus+taxi lanes and variations on that theme). Clearly, most places that you might want to cycle are not anywhere near covered by a convenient cycle-only(/dominant) path/road/lane/whatever. Even accounting for population density bias (a path-equipped city-centre ''can'' perhaps have a good few hundred thousand cyclists commuting along its copious off-street routes, whereas some remote area of equivalent road-length doesn't have more than a dozen people cycling around/through its country lanes on any given day), there's a distinct gap. 
And the problem is that car drivers (myself also being one, though only ''four'' decades behind the wheel, so what would I know?) seem to start to not anticipate bicycles on the road (or horses, or tractors, or anyone also driving but not actually going at-or-above the posted speed limit, etc) and at best they are startled/annoyed when they encounter their fellow road-users in different contexts. At worst, they 'come into contention' in a rather nasty way for at least one of the parties involved. 
'People on bikes' don't help when they (whether drivers themselves or not) do not obey [https://www.gov.uk/guidance/the-highway-code/rules-for-cyclists-59-to-82 the rules of the road], and/or footway. They give actual cyclists a bad name, make motorists less tolerant of those who actually are folling both the rights and responsibilities of cycle traffic and cause 'contention' with pedestrians on ''their'' supposedly safer routes (and road crossings), amongst other issues. The number of times I've seen someone progress rapidly down a pavement on two wheels, having to swerve round people, swerve to cross side-roads (to use the disabled-friendly drop-curbs), hop onto the road and back on again because of obstructions (curb-mounted parked cars/construction works) and all disrupting (or even causing danger to everyone else off/on the road)... Quite often, they would have been quicker ''and safer'' to have just ridden on the road ''with'' the traffic (without earphones in, they'd also be much more aware so could overtake the slower traffic legally and in full consideration). 
Even worse, when there's a 'pavement biker' riding alongside a road ''with a clearly marked cycle lane'' on it. Road space reserved, but they're endangering pedestrians (and potentially themselves) needlessly. But, adding in the reckless pedestrians who do ''their'' dangerous things (walking up the central reservation of a dual-carriageway, e.g.), it just goes to show that there are unthinking individuals using every form of locomotion and travel (I could moan about thoughtless bus/train passengers, too, and don't get me started on illegal eScooters, motorbikes that may skirt the rules to some extent and possibly soms illegal variations of eBike as well). But, insofar as cycling, I'm not convinced that (partially) changing the road system to mitigate for bad drivers is really the best solution. It barely scratches that surface, it gets abused/ignored by those it may be intended for, it makes those it isn't intended for more resentful/inconsiderate as a push-back and the only obvious and tangible metric is in the press release that "Trumpton Town Council has been able to add five more miles of cyclepath..." (which probably consists of several short stretches of red tarmac is frequently intruded upon by pre-existing highway signage/lamp-posts and frequent "Cyclists Dismount" advisories, running alongside a perfectly ridable road just so long as they filled the wheel-/suspension-damaging potholes and swept the gutters once in a while). 
Can you tell that I've often thought about all these issues? I could go on, or into more detail, but I reckon I've already written far too much, uninvited. [[Special:Contributions/172.70.85.218|172.70.85.218]] 11:48, 24 September 2023 (UTC)

The summation of the situation: 
UNSPECIFIED line + SHORT distance = bicycle, walking, etc. 
SPECIFIED line + SHORT distance = tram, everything in unspecified. 
SPECIFIED line + LONG distance = train. 
UNSPECIFIED line + LONG distance = automobile.
 
The '''most''' important combinations for urban planning are unspecified short and specified long which autos aren't good at. The one autos are good at is the least important. {{unsigned|Andrewtheexplainer|15:43, 24 September 2023}}
:In answer the the editor who asked the question in the Edit Summary, about what "SPECIFIED and UNSPECIFIED" mean: Purely from context, I believe "line" above means "route". Some routes are (or can be) established as consistently demanded (for commuting, shopping, between major hubs half a continent away, etc) and can be "specified" as schedulable service for mass transit/infrastructure (anything from viable greyhound route with suitable identifiable service stops to an airline route (requiring airports at each end) or something asking for a railway/hyperloop/road to be either maintained (because it already exists) or created (because it does not at the moment) and is worth the while for such a special consideration. There's a degree of predictability to it, because of a mix of the same people regularly needing to make the trip (e.g. commute) and/or a continual demand by new people to make that journey (touristic purposes).
:An 'unspecified' route, here, would then be anything ad-hoc, at a frequency or quantity of use well below any particular reason to uphold a service or infrastructure (or coordinated compound of such facilities, like a shuttle bus to and from the station/airport to collect those flying in from afar), and would be served by such private efforts across and through whatever generic routable methodologies exist to be be exploited.
:And each of those two distinctions is multiplied by (at least!) two separate distinctions, that of length. (I'd be tempted to further split into other distances. Maybe localised, district, intra-state (from a US perspective), national and international, but that'd depend on what groupings I was analusing, and obviously a train could take one from one end of a (large enough) neighbourhood to the other ''or'' across the country (with the right conenctivity, even into another one!), depending upon which train and where it stops. But the above seems sufficient, as opposed to my overthinking of it.) [[Special:Contributions/162.158.74.96|162.158.74.96]] 22:22, 24 September 2023 (UTC)

Talk:2790: Heat Pump

2023-06-18T09:55:08Z

162.158.74.96:

woah! an xkcd with color what was the last one with color? (im kinda new to xkcd) [[Special:Contributions/172.71.122.48|172.71.122.48]] 21:17, 16 June 2023 (UTC)Erfaniom
:I guess the last one with a lot of color was [[2750]]. More at [[:Category:Comics with color]]. [[Special:Contributions/162.158.167.11|162.158.167.11]] 17:29, 17 June 2023 (UTC)

I suppose color was needed to show the air temperature. Odd, though, that in summer (in the northern hemisphere), the character is trying to increase the indoor temperature. [[User:Davidhbrown|Davidhbrown]] ([[User talk:Davidhbrown|talk]]) 21:27, 16 June 2023 (UTC)
:He's not. He's moving the hot air from inside to the cooler outside. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 22:18, 16 June 2023 (UTC)
:::he's actually heating it, the comic is set in winter. It's a reference to the discussion about regulating heating systems in Germany. I added something about that in the explanation, but I don't think I made the citation right (I'm not to editing wikis) [[User:Marta]] ([[User talk:Marta|talk]]) 05:25, 17 June 2023 (UTC)
:::::The citation does not appear to strongly relate to the comic to me. I might be curious if Randall had a lot of comics queued and actually published a winter one in the summer, for example. [[Special:Contributions/172.69.59.112|172.69.59.112]] 00:19, 18 June 2023 (UTC)
::::::I agree, I think the Germany thing might probably be coincidental. Randall lives in North-Eastern America. It's unlikely, though quite possible, he was inspired enough by such foreign matters to base a comic on it. Still, you never know from whence inspiration may strike, in which case he published when he thought of it instead of when it'd be relevant... [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:40, 18 June 2023 (UTC)
:::::::News of this had not otherwise reached me over the German Ocean (i.e. North Sea), never mind where Randall is, way over the Pond (i.e. Atlantic). Not saying it wasn't a prominant bit of news, in his media feeds, but usually the problem is that something 'popularly heard about' state-side confuzzles anyone in (say) Europe/ex-Europe when used as inspiration for a comic without enough setup to it. Now, ''if'' say Penn./Mass. state legislature were being similarly proactive on such matters, I'd say it might be the cue for this. Otherwise, it might be better as an afterthough/Trivia instead of the lead-on paragraph. But I also don't know enough to know that it ''isn't'' worthy of such prominance, so this is just my thoughts, leaving others to alter it if they so wish... Anybody can do it, after all... [[Special:Contributions/162.158.74.96|162.158.74.96]] 09:55, 18 June 2023 (UTC)
::::Nearly right. Simple "insert URL" as a 'number' is single []s, or [<url><space>some text] to have it given linking text (preferable).
::::Plus you seem to have not used the four tildes, i.e. <code><nowiki>~~~~</nowiki></code> to sign the above comment (made it correct, for you), plus confusingly replied ''before'' another reply (so I indented you a bit more, as well as it now having that timestamp to make precedence clear).
::::But these are all things you'll pick up, I'm sure, if you're going to be getting [used] to wikis... Welcome! [[Special:Contributions/172.71.178.139|172.71.178.139]] 05:35, 17 June 2023 (UTC)
::I actully think he's warming the inside, already warmer than outside, by effectively (and literally!) squeezing the heat out of the cooler outdoors air.
::By compressing the cool outdoor air, he increases its temperature (p1v1/t1=p2v2/t2) to warmer than the warm indoor air, creating a squeezebox->room flow of heat energy, then returns to the outside before decompressing and lowering the temperature in his squeezebox below the cool-air temperature in order to create an outdoors->squeezebox flow of energy and repeat. (The comic has the cycle start at roughly half-way through that, and wraps round, but the heat-to-room seemed the most obvious starting place here.)
::Right now, I'd not wish to heat my indoors up (even at 11:30pm, like now), so I agree that it's a funny time of year show heat-adding (rather than heat removing), but it definitely is that. [[Special:Contributions/172.70.86.154|172.70.86.154]] 22:31, 16 June 2023 (UTC)
:::Assumption(?): Indoors is on the LHS and higher, outdoors on the RHS and lower, door opens outwards and steps down to "outside". He COULD instead be cooling a basement apartment with a door that opens inwards (like mine)... however he seems to make a noticeable difference to the red, not the blue, so... probably not. :-/ [[Special:Contributions/172.70.34.160|172.70.34.160]] 02:36, 17 June 2023 (UTC)
::: Since panel 3 shows it at its widest and bluest with "Release", I understand that to mean he's releasing the heat outside from inside - like an A/C does. The weird thing is then showing the reddest/smallest with "Radiate", that word means "make and release heat" to me. The thing is, past experience tells me Randall lives in roughly the same part of the world as me, same climate. That he's in the northern states (like, within a day's drive of the Canadian border), and the Eastern time zone, and it's summer for us. Only heat pumping people should want is pumping heat OUT of the house... [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:16, 18 June 2023 (UTC)
::::Releasing the spring. At that point, there's the same amount of heat within the device, but it's spread out more so that the temperature is lower (than it was, but also than the surrounding air, which is also ''negligibly'' compressed outwards of course). NB, it does ''not'' draw air into it.
::::Now he has a cool device, heat naturally flows into it until (sufficiently) equalised after a small wait. Take the outside-cool (and expanded) device inside and compress it (it does not expel air!) to have that amount of heat be in a smaller space and thus a higher temperature. High enough to (quite naturally) flow into the room. Thus low-temperature heat taken from outside and used to increase the higher-temperature heat inside, which is different to what happens if you trap and move cold ''air'' into a warm room. Though perhaps it looks like that on first appearance, except for the colour-cues going all screwy. [[Special:Contributions/162.158.74.96|162.158.74.96]] 09:55, 18 June 2023 (UTC)
Wasnt there a "My hobby is to open my refrigerator and when people tell me that doesnt help, I sneak into their house and use their AC?" Comic? I cant find it, but we should link it in the "how leaving a fridge open doesnt help" section [[Special:Contributions/172.71.142.158|172.71.142.158]] 23:36, 16 June 2023 (UTC)
:Sounds like Steven Wright, he has lots of those "my hobby is" jokes. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 13:29, 17 June 2023 (UTC)

I think it's talking about leaving the door open in general i.e. forgetting to close it when getting groceries, not specifically when he's moving the heat pump [[User:Firestar233|Firestar233]] ([[User talk:Firestar233|talk]]) 23:40, 16 June 2023 (UTC)

I can't think of a good reason to say this, but my new fridge doesn't warm up on the back. It warms on the sides. A bad (and quite a PITA reason) is I had to get a new fridge. Protip: don't panic, and do put the sacks of ice into something that won't leak. First time I've met a fridge that doesn't warm on the back.
Btw, red hot blue cold. Pink? Light blue? A light blue a pink? Shrug. [[Special:Contributions/172.70.43.31|172.70.43.31]] 23:57, 16 June 2023 (UTC)

How many trips would this take? I'll leave the exact parameters of the calculation up to you. (Nerd sniping attempt.) ~ Megan she/her [[user talk:megan|talk]]/[[special:contribs/megan|contribs]] 00:20, 17 June 2023 (UTC)
: 42. But stick figures are just lines and have no surface area for heat transfer.
[[Special:Contributions/172.70.134.236|172.70.134.236]] 01:02, 17 June 2023 (UTC)

Currently, the explanation says you use a heat pump to "transfer heat from a relatively cold area to a relatively hot area". I don't know anything about the named "ideal gas law" in order to be sure enough to change this, but isn't that the wrong way around? If an area is ALREADY cold, why would anybody transfer heat FROM it? 04:49, 18 June 2023 (UTC)
:Let's say it's winter, and it's cold outside. It's warmer inside, but not as warm as you'd like it to be, so you need to warm it up. Where are you going to get the heat from? Traditionally you'd use a boiler to heat up water or electric coils, but these use lots of energy. A heat pump is more efficient, it moves some of the heat from the cold air outside to the inside. You need a pump because it won't move spontaneously -- heat always goes from warmer to colder areas. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 09:49, 18 June 2023 (UTC)
:[edit conflict with the above reply, thus repetition, but as I was adding other stuff too...] It's fridge-logic! i.e., that's what fridges do... and if you're living in a cool climate, you can potentially heat your house above "too cold for indoors" temperatures by extracting heat from the "far too cold for indoors" air that is outside. [[Special:Contributions/162.158.74.96|162.158.74.96]] 09:55, 18 June 2023 (UTC)

2505: News Story Reaction

2021-08-23T17:33:24Z

162.158.74.96: Fixed a punctuation typo (I think)

{{comic
| number = 2505
| date = August 20, 2021
| title = News Story Reaction
| image = news_story_reaction.png
| titletext = Unless the next line is, "After we broke up, she blamed the painting and spent years planning her revenge, so my sorrow is mixed with relief that the dogs at least denied her that triumph."
}}

==Explanation==
{{incomplete|Created by MONA LISA(THE PAINTING)'S FIRST KISS. Do NOT delete this tag too soon.}}
In this comic, [[Cueball]] is at his computer, likely typing a comment after reading a shocking news story where the ''{{w|Mona Lisa}}'' has been attacked and shredded by a pack of wild dogs. The ''Mona Lisa'' is one of the most famous paintings in human history. At the time of this comic, the ''Mona Lisa'' has not been attacked and is unlikely to be shredded in this circumstance at least by dogs as it is painted on wood, rather than canvas.<ref>"Mona Lisa | Painting, Subject, Meaning, & Facts." ''Britannica'', December 4, 2020. Accessed August 20, 2021. https://www.britannica.com/topic/Mona-Lisa-painting</ref>

At the beginning of his comment, Cueball describes his reaction and disappointment about the event, describing the event as "a loss for humanity." Cueball is then reminded of his first kiss, which occurred inside of a {{w|JCPenney}}, where a picture of the ''Mona Lisa'' hung on one of its walls. He adds this to his comment, explaining that this is why the news hits him hard. However, his story has almost no relation to the ''Mona Lisa'', other than that the picture was at the scene and is unnecessary.

After posting the comment, Cueball reflects on this and mentions that not every news story is, or needs to be, about himself.

The title text describes an exception to this, where his experience IS directly related to the affected painting, as his ex seemingly planned to get revenge on the painting itself. Could be she let the dogs in, and so this extra info could lead to the polic finding she who did it.

==Transcript==
:[Cueball is sitting at a desk, typing on his laptop. What he types is shown above Cueball, as indicated by the line going from his hands to the text.]
:Cueball: Devastated to hear that a pack of wild dogs got into the Louvre and shredded the Mona Lisa.
:Cueball: What a loss for humanity.
:Cueball: My first kiss was in the aisle of a J.C. Penny{{sic}} that had a poster of the Mona Lisa on the wall, so this is hitting me especially hard.

:[Caption below the panel]
:Sometimes I have to remind myself not to make every news story about me.

==References==
<references />

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Animals]]

1728: Cron Mail

2016-09-02T14:53:09Z

162.158.74.96: /* Explanation */

{{comic
| number = 1728
| date = September 2, 2016
| title = Cron Mail
| image = cron_mail.png
| titletext = Take THAT, piece of 1980s-era infrastructure I've inexplicably maintained on my systems for 15 years despite never really learning how it works.
}}

==Explanation==
{{incomplete|More detailed explanation off Cron (with wiki links). Why would it break because of Cueball's action and what is the "etc/". Title text not explained at all.}}
On {{W|Unix}}-like systems, {{W|Cron|cron}} is a system program running in background which allows one to schedule jobs to run at well-defined time slots. It is conceptually the same software which has been used since, at least, the 1980s and is still heavily used in modern operating systems, for example in several {{w|Linux}} distributions. Many administrative tasks on servers can be automated with cron, like monitoring or updates. Most people administrating a server-like system with a UNIX-like operating system will therefore know it, at least the basics.

When one of these jobs produces output, that output is sent as an email to the user, using the {{w|Sendmail|sendmail}} program. A common situation on many Unix-like systems is that sendmail (or another email program) is not configured to send email to the actual email address of the person behind the user account that configured the cron job, and writes the mail in question to the file <code>/var/mail/username</code> (in {{w|Mbox|mbox}} format) instead. Most shells will check that file, and produce a message "You have new mail" when its timestamps have changed.

[[Cueball]] is not aware of all of the above, and expresses surprise at the repeated messages. [[Ponytail]] tells him to check <code>/var/mail/cueball</code> which contains a lot of messages from cron from all those 15 years he used cron without properly understanding how it works.

When he realizes what has happened, he configures the mail system so that it writes all mail from cron for his user to the <code>/etc/crontab</code> file, which is the main configuration file of cron (the <code>{{W|/etc}}</code> directory is used for configuration files on Unix-like systems), most probably breaking it, and ensuring that the shell will stop producing "You have new mail" messages.

In the worst case, cron might actually see the junk that [[Cueball]] is now directing into its configuration as valid configuration data and produce even more mail – resulting in a feedback situation that would eventually fill up the disk partition. It's unclear (especially to [[Cueball]]) whether this is actually possible – but it's certainly a risk.

==Transcript==
:[Cueball is sitting at a table in an office chair working on his laptop. Ponytail walks up to him.]
:Cueball: I've been getting these "You have new mail" UNIX notifications for like 15 years, but I've never bothered to figure out what it's talking about.

:[Ponytail has stopped behind Cueball who is typing on his laptop. When Ponytail (and later Cueball) mentions code, the text uses both small and capital letters (as opposed to only capital letters in all other text).]
:Ponytail: Look in /var/mail?
:Cueball: OK...
:Cueball: Oh, wow, there's like a gigabyte of stuff from Cron in here.

:[In a frame-less panel Ponytail is facepalming. Cueball is replying from off-panel with a starburst indicating his position.]
:Ponytail: *Sigh*
:Ponytail: You should fix your Cron, then point "MAILTO=" somewhere you actually see-
:Cueball (off-panel): Better idea:

:[Same setting as panel 2 but Cueball is visibly typing on the laptop as shown with three small curved lines over his hands on the keyboard.]
:Cueball: export MAILTO=/etc/crontab
:Cueball: There. Your move, Cron.
:Ponytail: Wow. Hardball.
:Cueball: Let's see how important it thinks that mail really is.

{{comic discussion}}

[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Cueball]]
[[Category:Computers]]