explain xkcd - User contributions [en]

Talk:3097: Bridge Types

2025-06-03T20:38:15Z

162.158.126.10:

For budget overrun, see olympic stadium of Montreal, Quebec, Canada.

[[Special:Contributions/162.158.126.202|162.158.126.202]] 01:23, 3 June 2025 (UTC)

Very disappointed there's no bridge card game reference, but I guess that's not one of Randall's types of nerdiness :( [[Special:Contributions/172.71.254.203|172.71.254.203]] 01:45, 3 June 2025 (UTC)

I would like to note that cable stayed bridges, budget overrun here, are much cheaper than equivalent suspension bridges. It because they use less materials and can be built faster meaning less labor. [[Special:Contributions/172.69.58.51|172.69.58.51]] 01:50, 3 June 2025‎
:Tru dat in general, but I think that this is a reference to the {{w|Leonard_P._Zakim_Bunker_Hill_Memorial_Bridge|Zakim Bridge}} in downtown Boston, part of the {{w|Big_Dig|"Big Dig"}} project that became notorious for its budget overruns and related shenanigans. Given that Randall M. lives in Boston, that makes this panel something of an inside joke. [[Special:Contributions/172.71.147.224|172.71.147.224]] 03:15, 3 June 2025 (UTC)

The [[wikipedia:St. Louis Arch|St. Louis Arch]] is a repurposed-elevator-suspended-arch-but-without-the-base-and-wires bridge if you squint hard enough. The elevator is also fun. [[Special:Contributions/172.69.67.214|172.69.67.214]] 01:57, 3 June 2025 (UTC)

Nothing about a a [[wikipedia:Bridge circuit|bridge circuit]] or these [[Wikipedia:Bridges (disambiguation)|many]] [[wikipedia:other|other]] bridges either. Sigh. [[Special:Contributions/172.69.67.214|172.69.67.214]] 01:57, 3 June 2025 (UTC)
:And where, oh where, are Lloyd, Beau, Jeff, and Jordan? [[Special:Contributions/162.158.41.84|162.158.41.84]] 03:19, 3 June 2025 (UTC)

The L'Engle is a take off on a Wrinkle in time? But this one is in space? <small> -- [[User:162.158.91.124|162.158.91.124]] ([[User talk:162.158.91.124|talk]]) 02:26, 3 June 2025‎ <span style="color:grey; white-space:nowrap;">''(please sign your comments with <nowiki>~~</nowiki>~~)''</span></small>
:There's some space-warping in L'Engle's books. [[Special:Contributions/162.158.174.63|162.158.174.63]] 02:44, 3 June 2025 (UTC)

The "budget overrun" bridge doesn't really look like the Zakim bridge to me. It looks a lot like the Samuel Beckett Bridge in Dublin. I don't know what the budget of that bridge was, but according to wiki it cost 60 million euros, which sounds like a lot given that the bridge isn't all that long or wide. [[Special:Contributions/172.70.126.87|172.70.126.87]] 03:24, 3 June 2025 (UTC)
: Perhaps if Randall M. drew too close a likeness to the Zakim Bridge, he feared a visit from officials with lawyers and/or cement shoes. ("Only the paranoid survive ...") It seems, from a quick tour of the Internet, that words like "grandiose and overblown" are easily applied to cable-stayed bridge designs/aesthetics. I wasn't easily able to find information on budget overruns for these bridges, and see the commentator above who pointed out the lower costs overall of cable-stayed ''vs'' suspension bridges. But as a former resident of Greater Boston, I can report the pervasiveness of the Big Dig and its challenges, budgetary and otherwise, in local life and lore. [[Special:Contributions/172.68.22.108|172.68.22.108]] 04:32, 3 June 2025 (UTC)
::The cable-stayed bridge is the current darling of artists that accidentally went to engineering school, who are notorious for running over budget and behind schedule. [[User:RegularSizedGuy|RegularSizedGuy]] ([[User talk:RegularSizedGuy|talk]]) 04:40, 3 June 2025 (UTC)
: I can see the suggestion of the Beckett bridge, but in my eyes the obvious template would be [https://en.wikipedia.org/wiki/Erasmusbrug Rotterdam's Erasmus Bridge] [[User:Nachtvogel|Nachtvogel]] ([[User talk:Nachtvogel|talk]]) 06:00, 3 June 2025 (UTC)

I think the repurposed elevator should be considered a dig at Elon Musks The Boring Company, even though they tunnel rather then bridge
[[Special:Contributions/162.158.182.138|162.158.182.138]] 04:37, 3 June 2025 (UTC)

Added a bunch of explanations [[Special:Contributions/162.158.8.132|162.158.8.132]] 07:31, 3 June 2025 (UTC)

The Repurposed Elevator is actually a real thing! https://en.wikipedia.org/wiki/Schmid_Peoplemover It's not as strange as you think. It's a space effective, but too expensive solution to the problem of not making cramped railway crossroads more cramped. [[Special:Contributions/162.158.172.112|162.158.172.112]] 07:39, 3 June 2025 (UTC)
: I've added it to the list. Feel free to do such changes yourself if you know something that can contribute. --[[Special:Contributions/172.71.183.12|172.71.183.12]] 08:07, 3 June 2025 (UTC)

For the "Google Earth Bridge" remark, [https://www.fastcompany.com/90186315/the-strange-art-of-the-melting-bridges-of-google-earth this article] might work as a citation. [[User:Conster|Conster]] ([[User talk:Conster|talk]]) 07:57, 3 June 2025 (UTC)
: Do we have to single out Google for this? Apple maps did a fantastic job of melting bridges as well... :D [[Special:Contributions/162.158.42.38|162.158.42.38]] 19:47, 3 June 2025 (UTC)

There seem to be stick figures on each bridge, except for the Arch. Is that on phone? Maybe he's saying nobody uses arch (Linux)? Or does anyone has any other idea as to why? [[Special:Contributions/172.69.128.184|172.69.128.184]] 08:21, 3 June 2025 (UTC)

Is there a reason for the trestle bridge to have a raised deck? They were iconically used for railways, where that would not work. --[[Special:Contributions/162.158.110.59|162.158.110.59]] 09:56, 3 June 2025 (UTC)

The jump in particular feels a lot like polybridge and I love it [[Special:Contributions/172.71.167.160|172.71.167.160]] 11:27, 3 June 2025 (UTC)

Alas, no love (or even any acknowlegement) for the {{w|Transporter bridge}}, it seams... [[Special:Contributions/172.69.79.165|172.69.79.165]] 16:11, 3 June 2025 (UTC)

I live in Montreal, and the "budget overrun" immediately made me think of our Olympic Stadium, which we affectionately call "The Big Owe".
[[Special:Contributions/162.158.126.10|162.158.126.10]] 20:38, 3 June 2025 (UTC)

== Suspended arch - tied-arch vs. through arch ==

The "suspended arch" bridge may or may not be a tied-arch bridge. Something has to stop the ends of the arch sliding outwards when there's a large load in the middle, but you can't tell what that something is from the image.

If that something is the bridge deck, being connected to the ends of the arch and under tension, than it's a tied-arch bridge (the deck ties the ends of the arch together). If that something is the arch foundations, and the deck is not under tension, then it's not a tied-arch bridge; it's just a simple through-arch bridge.

For more info on (real) bridges, [https://www.youtube.com/watch?v=DX_zkaK5PaI| Practical Engineering] --DW [[Special:Contributions/162.158.187.69|162.158.187.69]] 13:24, 3 June 2025 (UTC)

'Drawbridge' to me means a defensive bridge that crosses the moat of a castle, and can be pulled up when defending it. See, eg., my favourite castle https://en.wikipedia.org/wiki/Bodiam_Castle [[Special:Contributions/172.69.224.115|172.69.224.115]] 15:05, 3 June 2025 (UTC)
:Agreed. What they have there is a lift bridge. [[User:Yorkshire Pudding|Yorkshire Pudding]] ([[User talk:Yorkshire Pudding|talk]]) 15:55, 3 June 2025 (UTC)

Talk:1950: Chicken Pox and Name Statistics

2018-02-02T19:09:09Z

162.158.126.10: /* Logan */ new section

I think Randall missed an opportunity to do another “make you feel old” joke here, perhaps something like “if your age isn’t on the chart, your doctors probably still thought chicken pox was caused by imbalanced humors or angry gods” or something. [[User:PotatoGod|PotatoGod]] ([[User talk:PotatoGod|talk]]) 15:24, 2 February 2018 (UTC)

Shouldn't the vaccine note have been placed at age 23, not 28, if the vaccine was introduced in 1995? [[User:Rockcell|Rockcell]] ([[User talk:Rockcell|talk]]) 15:28, 2 February 2018 (UTC)
:When do children get their first smallpox vaccine? If that's around three that might be one explanation for the position of the note. Also the vaccine wasn't only used on children born after its introduction, kids that were already a few years old but never had smallpox could still have gotten their shots. [[Special:Contributions/108.162.229.220|108.162.229.220]] 15:52, 2 February 2018 (UTC)

This isn't *smallpox*. Smallpox was eliminated in the middle of the 20th century, so it's weird if anyone gets it. Also: my understanding is that most people who got smallpox died before they got to be old enough to be on any of those graphs.

I found the top graph very hard to interpret, so I've included my interpretation here for posterity: If you are 35 years old, then you were a young child before the vaccine was introduced and probably 100% of the people you knew as a child got chicken pox. If you are 20-25 years old, there's a 50-50 chance that you got the vaccine and, as a result, about 50% of the people you knew as a child got chicken pox. If you are 10 years old, then you more than likely got the vaccine and have a low probably of getting chicken pox. If you are under 5, you probably don't know many other kids. [[Special:Contributions/162.158.62.39|162.158.62.39]] 17:03, 2 February 2018 (UTC)

Wait, this has nothing to do with confusing correlation with causation, right? The assumption is simply that if most of the kids your age got chicken pox, which is likely if you have certain names, you will consider chicken pox to be normal and common, which seems like a reasonable claim. On the other hand, if the comic hadn't said that, the implication would be that people with certain names cause chicken pox, which would be confusing correlation with causation. -[[Special:Contributions/108.162.219.16|108.162.219.16]] 17:17, 2 February 2018 (UTC)

:I agree, that’s how I interpreted the comic as well [[User:PotatoGod|PotatoGod]] ([[User talk:PotatoGod|talk]]) 18:15, 2 February 2018 (UTC)

:I also agree, if anything this is doing the opposite and assuming no underlying causality between names and chickenpox likelihood, so that the people who got chickenpox should be distributed randomly amongst all names at any given time.[[Special:Contributions/162.158.78.184|162.158.78.184]] 19:06, 2 February 2018 (UTC)

== Logan ==

Logan becomes less popular at age 30. Coincidence? --[[Special:Contributions/162.158.126.10|162.158.126.10]] 19:09, 2 February 2018 (UTC)

1950: Chicken Pox and Name Statistics

2018-02-02T19:08:11Z

162.158.126.10:

{{comic
| number = 1950
| date = February 2, 2018
| title = Chicken Pox and Name Statistics
| image = chicken_pox_and_name_statistics.png
| titletext = People with all six of those names agree that it's weird that we have teeth, when you think about it for too long. Just about everyone agrees on that, except—in a still-unexplained statistical anomaly—people named "Trevor."
}}

==Explanation==
{{incomplete|Created by a TREVOR WITH NO TEETH - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
This comic jokes that, due to the overlay of frequency of name choices with chicken pox occurrence, people with some names are more likely to think that chicken pox is normal while others don't. It relies on the same fallacy as [[1138: Heatmap]] which is thinking that [[552: Correlation]] implies causation (here both the proportion of kids with chicken pox and the proportion of names depend of the date of birth, but have no direct causal link from one to the other). The claim is dubious, but humorous. This comic is a [[:Category:Fun fact|Fun Fact]].

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
: [The comic is divided into three vertical frames, and a caption.]

: [Title] Fraction of Kids your age who got chicken Pox.
: Very rough US Estimates based on D01:10:15585/mmwr.mm6534a4 and D01:10.1016/j.vaccine.2012.05.050
: Vaccine introduced in 1995

: [Title] Relative Popularity of several names in your age group.
: [Source: ssa.gov]
: [Lists Harper, Sarah, Jaxon, Brian, Brooklyn, Logan]

: [Title] Chicken Pox incidence by name:
: [Subtitle] (Very rough estimate)
:* Brian: 75%
:* Sarah: 50%
:* Logan: 20%
:* Brooklyn 10%
:* Jaxon: 4%
:* Harper: 2%

: [Caption] Fun Fact: People named "Sarah" and "Brian" think chicken pox is normal and common, and people named "Logan" and "Harper" do not.

{{comic discussion}}

[[Category:Fun fact]]