explain xkcd - User contributions [en]

728: iPad

2015-03-11T14:07:30Z

108.162.217.173: /* Explanation */

{{comic
| number = 728
| date = April 16, 2010
| title = iPad
| image = ipad.png
| titletext = Maybe we're all gonna die, but we're gonna die in *really cool ways*.
}}

==Explanation==
In this comic, [[Cueball]] is entertained by his {{w|iPad}} because messing around with it is so fun and feels futuristic. [[Megan]] tries to bring perspective to him by telling him that his fun is really not so fun because so many exciting and much more impressive things are to come. Cueball still objects, because that makes him feel that he's too easily impressed by trivial things, and says that Megan is spoiling his fun by trying to make his source of entertainment seem less cool.

The title is showing how cueball is, instead of being horrified by all the new ways to die technology could present, is, like a scientist, enthralled by the many newer ways that death could occur.

==Transcript==
:[Cueball is sitting in an armchair, playing with an iPad. Megan is looking over his shoulder.]
:Cueball: Navigating Google Maps on the iPad is fun. It feels so futuristic.
:Cueball: Swoosh! Zoom!

:Megan: There are, right now, monkeys controlling robotic arms via neural implants.

:Megan: A huge and alien future is barreling toward us. And I can't WAIT.

:Megan: But no, your iPad is cool, too.
:Cueball: Stop spoiling my future with your slightly more distant one.

{{comic discussion}}
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]

Talk:1474: Screws

2015-02-21T16:58:14Z

108.162.217.173:

I believe 'Uranium Screw' is referring to a screw with a "half life" of sorts - these types of flathead screws (which obviously exist, just are not as common) tend to "split in half" when they fail as opposed to just stripping. Half of the head splits off, similar to uranium decaying halfway. [[Special:Contributions/108.162.217.173|108.162.217.173]] 16:58, 21 February 2015 (UTC)

This page is now on the first page of google for "uranium screw". [[User:Mrmakeit|Mrmakeit]] ([[User talk:Mrmakeit|talk]]) 05:31, 16 January 2015 (UTC)
:And as of now, this page is the #1 result for "uranium screw". The second is the xkcd fora thread on this comic, and the third is our home page. [[User:NealCruco|NealCruco]] ([[User talk:NealCruco|talk]]) 16:47, 16 January 2015 (UTC)

I don't think that patent is the right one, it seems to describe a uranium decontamination procedure, not a screw made of uranium like in the comic. [[User:LeoDeQuirm|LeoDeQuirm]] ([[User talk:LeoDeQuirm|talk]]) 05:46, 16 January 2015 (UTC)

I'm pretty sure the "uranium screw" is just a reference to the fact that the head of the screw appears to have split in two ("fissioned"), as opposed to a normal flat head screw that still has the edges connected. [[User:Sam887|Sam887]] ([[User talk:Sam887|talk]]) 05:50, 16 January 2015 (UTC)

Just a shot in the dark here, but a company that sells uranium ore and radiological equipment happens to also sell screws for one of its Geigers that look just like the screw cross-section in the comic. [http://www.uraniumrocks.com/products/replacement-circuit-board-mount-screws-for-victoreen-cdv-700-short] [[User:Conqu2|Conqu2]] ([[User talk:Conqu2|talk]]) 06:01, 16 January 2015 (UTC)

I was wondering if the "uranium screw" was referring to the Demon Core -- two hemispherical domes that Louis Slotin was holding apart with a screwdriver. Then I remembered the Demon Core was plutonium, not uranium. [[Special:Contributions/173.245.48.119|173.245.48.119]] 06:49, 16 January 2015 (UTC)

There are ferrous alloys containing (depleted, of course ;-) uranium for "increase[d] toughness and strength". [http://en.wikipedia.org/wiki/Ferrouranium] [[User:Knob creek|Knob creek]] ([[User talk:Knob creek|talk]]) 09:21, 16 January 2015 (UTC)

I think the be was going for apple's pentalobe screw with the 5 pointed star {{unsigned ip|108.162.238.162}}

I don't think the uranium screws are named for their use in stuff to do with uranium, as I have both seen and used screws that look like that before. It's basically a flat head screw whose divot extends all the way across the face of the screw. I agree more with the previous commentor who notes that the screw looks like it has fissioned. [[Special:Contributions/108.162.237.182|108.162.237.182]] 06:34, 16 January 2015 (UTC)

An actual rivet is neither a screw nor a bolt; it's a fastener that is placed and then has one end plastically deformed -- traditionally by a rivet gun, but more often in smaller sizes by some sort of press or clamp. (Pop rivets are hollow, and are deformed by pulling a cone-sheaped wedge into the open end of the hollow core.) There's no way to remove one except to destroy it (drill it out or cut one end off). The item pictured could also be the head of a carriage bolt, but that's no help if you can't get at the other end of the bolt. Randall is slightly pessemistic, though: there *are* some "security" screws and bolts that use a slightly-elliptical domed head that's hard to tell from a rivet; they can be unscrewed, but only with a matching slightly-elliptical socket. [[Special:Contributions/199.27.133.70|199.27.133.70]] 06:35, 16 January 2015 (UTC)

All of which can be removed by a sonic screwdriver. Totally a real thing. {{unsigned ip|173.245.50.86}}

Could the "cursed -1" be a Nethack reference? I don't know if Dungeons and Dragons has the "blessed/uncursed/cursed" status, but in Nethack cursed items with negative enchantments (denoted "cursed -whatever") are a pretty common occurrence. [[Special:Contributions/199.27.133.25|199.27.133.25]] 07:31, 16 January 2015 (UTC)

In Nethack, Cursed objects cannot be removed. Seems appropriate. At first I thought it was a pozidrive screw head. Posts on the fission screw head: where have you seen screws whose divot does *not* extend across the head? {{unsigned ip|199.27.128.230}}

[[User:Kreuiter|Kreuiter]] ([[User talk:Kreuiter|talk]]) 08:03, 16 January 2015 (UTC)from wikipedia: Louis Philippe Joseph d'Orléans (13 April 1747 – 6 November 1793) commonly known as Philippe, was a member of a cadet branch of the House of Bourbon, the ruling dynasty of France. He actively supported the French Revolution and adopted the name Philippe Égalité, but was nonetheless guillotined during the Reign of Terror

I don't think it is specifically a reference to Nethack as a lot of ol games (both video and tabletop) use the mechanic of non removable cursed objects. It is common enough in my opinion that we could argue about until we are blue in the face and get nowhere. {{unsigned ip|108.162.237.193}}

uranium screw may be a reference to [http://en.wikipedia.org/wiki/Louis_Slotin#Criticality_accident Louis Slotin], who died when he was using a screw driver to seperate two halves of a plutonium sphere as part of a science demonstration, and triggered a large burst of radiation when his hand slipped.
--[[Special:Contributions/108.162.216.59|108.162.216.59]] 08:28, 16 January 2015 (UTC)

I'm thinking it might benefit the article to include a place in the wikitable for the correct term for each drive socket. Of course their are not correct terms for each of them. Not to mention rivets and Phillip's heads don't even have drive sockets. [[Special:Contributions/173.245.56.189|173.245.56.189]] 09:04, 16 January 2015 (UTC)BLuDgeons

If you suggest cursed-1 is because if misuse - I in first place thought of [http://en.wikipedia.org/wiki/List_of_screw_drives#Pozidriv] as the cursed one - because Philipps and Pozidriv are slightly incompatible and causes damage. [[Special:Contributions/108.162.254.18|108.162.254.18]] 09:09, 16 January 2015 (UTC)

:+1, the cursed one looked to me like pozidriv at the first glance, and it's really cursed as interchanging them leads to damage ... And the most fun is when you get some Chinese crap that looks like pozidriv but it doesn't fit so you use philips which doesn't quite fit too but at least it can be inserted and you end up damaging both the driver and the screw :-/ --kavol, [[Special:Contributions/108.162.254.96|108.162.254.96]] 10:02, 16 January 2015 (UTC)

Is it really true that Phillips head are 'commonly used in construction'? At least in Europe they were replaced by Pozidriv in the 1990's and these days by Torx. {{unsigned|Popup}}
:As a former (late 2000s to 2012, pre-college) construction worker in California, Texas, and Oklahoma, yes. Philips are very common in construction here. [[Special:Contributions/108.162.221.243|108.162.221.243]] 06:08, 17 January 2015 (UTC)

Maybe this depends on the quality of the product? If i look around, i find lots of products held together by phillips screws and only a few (usually more hi-tech and expensive) one with torx screws. [[User:Knob creek|Knob creek]] ([[User talk:Knob creek|talk]]) 09:28, 16 January 2015 (UTC)

:er, what do you call "a product"? - If "construction" is mentioned, I imagine things like wooden skeleton of a roof, fastening of windows/doors, self-tapping screws, wallplug screws ... and it's almost 100% pozidriv and torx here in central Europe. ("Almost" accounts for imports by non-european companies.) If I imagine metal constructions, from racks to bridges, hex and inbus (= hex slot) prevail. --kavol, [[Special:Contributions/108.162.254.96|108.162.254.96]] 10:02, 16 January 2015 (UTC)

:: Granted I'm not in the construction trade, and I'm in UK rather than continental Europe, but I have never seen Torx used in construction. In my experience, the majority is Pozi, and the rest is Phillips. --[[User:Pudder|Pudder]] ([[User talk:Pudder|talk]]) 13:06, 16 January 2015 (UTC)

Perhaps a reference to http://xkcd.com/927/ - Standards? [[Special:Contributions/141.101.79.61|141.101.79.61]]

Phillips screws have a larger number for larger size, not smaller. {{unsigned ip|108.162.216.35}}

I'm surprised Randall didn't include square/Robertson screws/drivers. Just as bad as hex-recess, but when you actually USE them they are great! Combination Robertson-Phillips are good too but rarer. And do NOT get me started about the untold types of tamper-proof designs... --BigMal // [[Special:Contributions/108.162.216.209|108.162.216.209]] 13:06, 16 January 2015 (UTC)
:The most awkward, I find, are star-shaped (5/6-pointer) screws with a central 'post' that requires a hole-ended screwdriver-bit of the appropriate shape to be used (may also aid in positive positioning of the tool, but not much more than normally so SFAICT it's just there to be awkward without the right tools by manufacturer-mandated professionals). Luckily, I've ''got'' screwdriver-heads for just about every conceivable 'uncursed' screwhead (48 different types and sizes in one handy kit alone, not even counting socket-heads and 'cursed' screw drilling-outers). Especially good for laptop repair, to get around deliberately proprietry systems with small and (deliberately) akward screws; as opposed to bicycle repair, which I'm sure is usually for the stated practical torque reasons. [[Special:Contributions/141.101.98.247|141.101.98.247]] 13:59, 16 January 2015 (UTC)

"cursed -1 <something>" is definitely a standard NetHack item description format, but it applies to D&D too. In general, "cursed" means you cannot remove the item, and the number is describing the item's effectiveness compared to a standard (+0) version of the item. In this case, both can be appropriate: "cursed" because -as noted- you cannot remove it in the normal way. "-1" probably comes from being unable to tighten the screw far enough to fully satisfy its purpose: maybe the joint is slightly loose, or the head of the screw is left slightly protruding, so that it easily catches on other things.
[[Special:Contributions/141.101.80.80|141.101.80.80]] 13:28, 16 January 2015 (UTC)

Rather than two (still) separate fissile hemispheres, that 'gap' is obviously a continuation of material around the back of a schematic cross-section of a whole sphere with a core currently missing. I think the fissile plug will be inserted/fired at the required juncture to fill this, from the side. Very like the device in the film The Fifth Protocol, for easy cinematic reference of the concept. (Noting that 'gun-type' nuclear devices tend to fire the 'enclosing' larger subcritical mass, spheroidal or cylindrical ''onto'' the smaller and fixed 'plug' to fill the gap between it and the surrounding neutron reflector jacket. For several very good reasons. Thus that sphere would be shoved onto the currently missing 'core', although it makes the reflector assembly and positioning a bit more complex as well, compared with a cylindrical sleeve.) [[Special:Contributions/141.101.98.247|141.101.98.247]] 13:49, 16 January 2015 (UTC)

The Cursed -1 Phillips Head is much more likely to be a [http://en.wikipedia.org/wiki/List_of_screw_drives#Pozidriv Pozidriv] head than a worn Philips head. The cursed -1 implication if used with a Philips driver is certainly deserved. [[Special:Contributions/141.101.106.101|141.101.106.101]] 14:59, 16 January 2015 (UTC)

Re: Uranium Screw... see http://www.google.com/patents/US20060088457{{unsigned ip|108.162.219.97}}

Uranium screws were used in the assembly of the Fat Man nuclear bomb. All parts of the tamper were made with natural uranium, including the screws and hinges:
http://blog.nuclearsecrecy.com/2014/11/10/fat-mans-uranium/
[[User:Rocbolt|Rocbolt]] ([[User talk:Rocbolt|talk]]) 15:34, 16 January 2015 (UTC)rocbolt

[[User:Rocbolt]] has it right. It's not a metaphor or a joke. https://www.google.com/search?q=%22uranium%20screws%22%20%2dxkcd [[User:Pesthouse|Pesthouse]] ([[User talk:Pesthouse|talk]]) 15:41, 16 January 2015 (UTC)

Did anyone notice that the "shortcut icon" of the page was changed together with this comic? Its sort of blurred: http://i.imgur.com/ArEbL5r.jpg?1 compared to the original image http://xkcd.com/s/919f27.ico {{unsigned ip|141.101.80.4}}

Possibly a reference to Apple's iPhone "tamper-resistant" screws http://en.wikipedia.org/wiki/Pentalobe_screw [[Special:Contributions/188.114.98.252|188.114.98.252]] 17:38, 16 January 2015 (UTC)

Screws made of uranium were used to hold the tamper plug of the fissile core of the Trinity nuclear device together. I think that's what "Uranium Screw" refers to, and why the screw is radiating: it is radioactive. [[User:Arnold Chiari II|Arnold Chiari II]] ([[User talk:Arnold Chiari II|talk]]) 15:35, 16 January 2015 (UTC)

Not sure why the page says depleted Uranium. I think they were natural uranium, which is radioactive. Rocbolt's reference supports this [[User:Arnold Chiari II|Arnold Chiari II]] ([[User talk:Arnold Chiari II|talk]]) 21:26, 16 January 2015 (UTC)

Depleted uranium is nearly pure U-238, which '''is''' radioactive, but has a half-life 6X longer than U-235.

Technically, a rivet '''is''' a bolt, but the usage of ''bolt'' to refer to a non-threaded object with a head is archaic.

I have seen a few objects that look like "flat head", where the slot doesn't extend all the way out to the edge, but precious few, compared to the fairly common "standard" woodscrew, where the slot goes all the way to the edge, as shown at "uranium screw".

I thought "Cursed -1" was a clever double reference to the common RPG meme and to what happens after someone has confounded Philips, Pozidriv, or Reed and Prince with one of the others and the fireworks from using a tool designed for one on a screw of another type.--[[Special:Contributions/199.27.128.197|199.27.128.197]] 00:32, 17 January 2015 (UTC)

Could the Amazon one be a reference to star ratings? --[[Special:Contributions/108.162.221.167|108.162.221.167]] 01:58, 17 January 2015 (UTC)

My thoughts exactly. And another thing: the slot of the flathead doesn't go "through" because this makes for a visual +/- gag. [[Special:Contributions/108.162.230.221|108.162.230.221]] 20:22, 17 January 2015 (UTC)

The rivet could also be a nail. While a nail isn't a screw, neither is a rivet. [[User:Glen442|Glen442]] ([[User talk:Glen442|talk]]) 03:20, 17 January 2015 (UTC)

I think the bit about "Phillip's Head" is an obvious note about the frustration of dealing with different screw types -- as in "I'm so frustrated dealing with all these screw types I'm going to find the inventor of the Phillips head screw and chop his head off!" {{unsigned ip|199.27.133.137}}

Shouldn't that be 'an allen key' and not a wrench? I'm willing to acknowledge the inventor (Allen) but it's a key, not a wrench, by any definition. [[Special:Contributions/141.101.104.135|141.101.104.135]] 23:34, 17 January 2015 (UTC)

Isn't Philip's head a joke about his frustration with types of screws? [[User:Halfhat|Halfhat]] ([[User talk:Halfhat|talk]]) 17:34, 18 January 2015 (UTC)

It is my opinion that "Phillip's Head" (the bloody sack) is actually a reference to "King Philip" ''(note the spelling with only one 'L')'', an American Indian of the Wompanoag tribe in the latter 1600s who was the leader of an uprising against the settlers of Plymouth Colony. He was killed in 1676 and his corpse mutilated, with the head separated from the body and the body itself dismembered. The head was spiked and carried to Plymouth Settlement, eventually being placed on the Plymouth Colony Fort where it was left to languish for some 25 years. The head (by now merely a jawless skull) was eventually secreted away by a colonial family that was friendly to him; they kept King Philip’s head for many generations before giving it to his descendants.[[Special:Contributions/108.162.217.161|108.162.217.161]] 09:58, 18 January 2015 (UTC)

Perhaps the five-pointed star screw and its Amazon reference refer to the fact that it looks like a review star on Amazon? {{unsigned ip|173.245.53.10}}

I feel I have to question the phrase "Imperial-sized hex screws do sometimes surface, to the dissatisfaction of anyone who owns a hex driver set." As a mentor for a FIRST Robotics Team (Go 811!), we use Imperial-sized hex screws all the time. And here in the US, Imperial hex/Allen wrenches/keys are more common than their Metric counterparts. (sigh ... maybe SOMEday we'll wise up and go metric ...) --[[User:Mr. I|Mr. I]] ([[User talk:Mr. I|talk]]) 18:58, 19 January 2015 (UTC)

I've just removed what I consider to be excess bloat from the explanation. I'm sure some people will disagree, but to me the descriptions of the screws were getting bogged down in excessive an unecessary details. As an example, the fact that torx screws are able to be used for higher torques really doesn't have anything to do with the comic. The long rambling sentence about french royalty being guillotined was interesting (to me at least), but didn't really come to a conclusion. --[[User:Pudder|Pudder]] ([[User talk:Pudder|talk]]) 17:23, 21 January 2015 (UTC)

986: Drinking Fountains

2014-10-10T19:00:53Z

108.162.217.173: Added link to biology discussion

{{comic
| number = 986
| date = December 5, 2011
| title = Drinking Fountains
| image = drinking_fountains.png
| titletext = I've always wondered whether you could drink slowly enough, and eliminate fast enough, that you just sort of peed continuously. But I'm afraid to try because I worry someone might call while I'm doing it and ask what I'm up to, and I won't be able to think of a lie.
}}

==Explanation==
Here, we see [[Cueball]], using the restroom, as the title text indicates, he is eliminating the liquid waste from his body, or peeing. He says that he avoids the use of the drinking fountain right after peeing, because he is afraid that he will be forced into immediately peeing again. And as in the image above, he would be stuck in a loop. A loop is a computer science term, but also used elsewhere, to indicates going through the same steps over and over again. In this case, the bathroom and drinking fountain form an infinite loop, which, when used about computers, refers to a loop which never ends, eventually crashing the computer, which is therefore a situation to be avoided at all costs.

The title text says Cueball/[[Randall]] would be embarrassed in trying to explain his experiment to someone, as an experiment of this nature seems interesting to geeks but gross to non geeks, and he wouldn't be able to lie about what he was doing if called by someone.

A thread on yahoo answers [https://answers.yahoo.com/question/index?qid=20081204204655AApXIEA] with a (purported) Biology major concluded that drinking from a hose and peeing at the same time would not work: the liver can only process so much water at a time, and the majority of it is re-used.

==Transcript==
:[Cueball leaving a public bathroom. A water fountain is next to the bathroom door. An arrow points to the next panel.]

:[Cueball drinking from the water fountain. An arrow points to the next panel.]

:[Cueball reenters the bathroom. An arrow points back to the first panel.]

:I avoid drinking fountains outside bathrooms because I'm afraid of getting trapped in a loop.

{{comic discussion}}
[[Category:Comics featuring Cueball]]

1063: Kill Hitler

2014-09-21T22:41:01Z

108.162.217.173: /* Explanation */ sigh

{{comic
| number = 1063
| date = June 1, 2012
| title = Kill Hitler
| image = kill_hitler.png
| titletext = Revised directive: It is forbidden for you to interfere with human history until you've at least taken a class on it.
}}

==Explanation==
[[Black Hat]] creates a one-use time machine. [[Cueball]] selects the most common suggestion for a time machine usage: killing {{w|Adolf Hitler}}. Black Hat finally relents and goes to kill Hitler. He goes back to 1945 when Hitler, holed up in his command bunker and, as Soviet troops approached, committed suicide. This is typical Black Hat behavior, going out of his way just to troll people like Cueball, in this case deliberately ''not'' changing any history or avoiding any of the atrocities carried out by Nazi Germany. Though that might be for the best, since [http://tvtropes.org/pmwiki/pmwiki.php/Main/HitlersTimeTravelExemptionAct killing Hitler early might cause more problems than it would solve].

Incidentally, there are conspiracy theories that Hitler was shot by someone other than himself.

"BRB" is an abbreviation that stands for "be right back".

The title text also refers to the time travel theme from the {{w|Superman}} movie in which Jor-El states: "It is forbidden for you to interfere with human history".

==Transcript==
:[Black Hat and Cueball stand in front of a double door, which bears the label 'TIME door'. Black Hat has his hands on his hips.]
:Black Hat: I finished my time machine, but it's one-use only.
:Cueball: You ''gotta'' kill Hitler.

:[Close-up of Black Hat, one hand palm upward.]
:Black Hat: Why are you so obsessed with this Hitler guy? We have ''all'' of ''time'' we could explore!

:[Close-up of Cueball with both hands palm upward.]
:Cueball: He's evil incarnate! He murdered millions and sparked global war! ''Everyone'' agrees—if you get a time machine, you kill Hitler.

:[Black Hat enters the now open Time door as the other man looks on..]
:Black Hat: Fine, fine, I get it! Calm down. BRB, killing Hitler.

:[Black Hat returns and shuts the door, Cueball has outstretched arms.]
:Black Hat: There. Done. Are you happy?
:Cueball: ''Thank'' you.
:Black Hat: He was in some kind of bunker. 1945 was ''loud!''
:Cueball: '''''NO!'''''

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Black Hat]]
[[Category:Comics featuring Hitler]]
[[Category:Time travel]]