explain xkcd - User contributions [en]

3067: SawStart

2025-03-24T19:12:24Z

162.158.175.61: /* Explanation */

{{comic
| number = 3067
| date = March 24, 2025
| title = SawStart
| image = sawstart.png
| imagesize = 290x313px
| noexpand = true
| titletext = Unfortunately, SawStart is one-use-only. Once started, the blade cannot be stopped, and must be replaced with a fresh blade while the running one is carefully disposed of.
}}

==Explanation==
{{incomplete|Language is too informal and convoluted.}}

{{w|SawStop}} is an American {{w|table saw}} manufacturer whose product is designed to increase safety. Table saws can be highly dangerous if not used properly, because they feature a rapidly spinning {{w|circular saw}} protruding from the surface. If any part of someone's body come into contact with the blade while it's spinning, it can cause severe injury or death. SawStop products feature an automatic brake, designed to detect when flesh comes into contact with the blade. According to manufacturer claims, the brake (an aluminum block) will stop the blade within 5 milliseconds of detecting contact, followed by the blade retracting into the table. This is intended to prevent major injuries in the event of contact.

Black Hat here takes the notion of a product designed to increase safety, and changes the design to do the opposite, making it much more dangerous. Like the SawStop design, his product ostensibly detects contact with skin and reacts within milliseconds, but rather than stopping the blade, his product uses an explosive charge to ''start'' a stationary blade. It's unknown whether the blade would be faster than normal, and actually make it more dangerous (ordinary speeds of a table saw are more than capable of destroying living tissue), but setting off an explosive charge while in contact with such a blade is probably not a particularly good idea. It is not wise, in general, to touch even a normal stopped blade (without being absolutely certain that the power cannot be turned on, or even just through the stationary sharpness), but in this case it specifically is designed to make one that theoretically could be touched run up to significantly damaging speeds the moment it is. There is no benefit to such a system, and it exists solely to be malicious (which is likely why it's "less popular").

The title text refers to the fact that the braking feature on the SawStop is single use. Because of the very fast response time, both the braking cartridge and the saw blade will be badly damaged in the process, and both will need to be replaced (this being considered preferable to the kinds of permanent injuries that can result from a spinning blade). The SawStart is also single use, but in its case, it somehow makes the blade impossible to stop, violating the second law of thermodynamics and probably several other laws{{Citation needed}}. Hence, the SawStart blade must also be replaced, but this apparently has to be done while the blade is spinning. To attempt to remove a spinning blade is incredibly dangerous, and this simply adds to the unnecessary harm this product could do.

A similar thing was done in comic [[2876|(needs title)]], but that time was with a rocket.

==Transcript==

:[Black Hat gestures to a table saw called SawStart, facing Megan and Cueball. The SawStart label depicts a circular saw blade behind the word Saw]:
:Black Hat: When the saw detects contact with skin, an explosive charge starts the blade spinning at full speed within a few milliseconds.

:[Caption below the panel:]
:SawStop's less-popular competitor

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Black Hat]]

Talk:2863: Space Typography

2023-12-05T23:38:09Z

162.158.175.61: /* what if? news! */ new section

Are the dot's actually roughly in line with the distances?

[[Special:Contributions/172.71.135.78|172.71.135.78]] 21:31, 4 December 2023 (UTC)

Yes they are. I eyeballed with a screenruler and calculated

* 0.40 AU for Mercury (Should be 0.37)
* 0.72 AU for Venus (0.72)
* 1 AU for earth (reference)
* 1.54 AU for Mars (1.52)
* 5.24 AU for Jupiter (4.98)

[[Special:Contributions/162.158.202.94|162.158.202.94]] 21:48, 4 December 2023 (UTC)

But what size font?[[User:Danger Kitty|Danger Kitty]] ([[User talk:Danger Kitty|talk]])
:129 trillion pt, give or take. [[Special:Contributions/141.101.105.109|141.101.105.109]] 23:02, 4 December 2023 (UTC)
:: Thanks for the decimal-point check. This is my worksheet: [https://i.postimg.cc/tRsmk3c6/Oprimistic-AU.gif Image] (open in new tab) [[User:PRR|PRR]] ([[User talk:PRR|talk]]) 02:13, 5 December 2023 (UTC)

The number of "e"s between h and r required to make Saturn line up is about 59 (tested using 27.2 pt font) [[User:Digin|Digin]] ([[User talk:Digin|talk]]) 22:17, 4 December 2023 (UTC)
: There are currently three different figures in the explanation for how many "e"s are needed. One says the title text is correct as written, brackets and ellipsis and all. One says 59. One says 85. They can't all be right. [[User:LtPowers|LtPowers]] ([[User talk:LtPowers|talk]]) 13:22, 5 December 2023 (UTC)
:: "They can't all be right." Well, they can, if they don't correspond to the same thing. Are we using the font size from the comic, or from the hover text? [[User:Rexon Mobile|Rexon Mobile]] ([[User talk:Rexon Mobile|talk]]) 15:39, 5 December 2023 (UTC)

:: I think the [...] has to be condensing what should be a longer title text. If is was "correct as written", that's an extra 3 dots that don't correspond to planets or anything in that region of space. So unless someone can find some objects in that part of space, I think "correct as written" should be vetoed. Also, can't use periods, colons, or semicolons -- would need to separate the main sentence from the title text addition using perhaps a dash or a comma (as long as a comma isn't as comet). [[User:N0lqu|-boB]] ([[User talk:N0lqu|talk]]) 17:22, 5 December 2023 (UTC)
::: The sentence is using only the dots that are part of 'i's. Although the comic's text refers to "dots" without specifying that restriction, we don't have to assume that 'j's and punctuation must also correspond to solar system bodies. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 20:06, 5 December 2023 (UTC)

I’m curious whether randall brute forced this, trained a neural network, or did it by hand. [[Special:Contributions/172.70.175.179|172.70.175.179]] 22:31, 4 December 2023 (UTC)
:He would probably answer: [[2173: Trained a Neural Net]] [[Special:Contributions/172.70.42.217|172.70.42.217]] 22:45, 4 December 2023 (UTC)

Trying to prep an image of a comparison between actual orbits and the comic, but it's taking longer than i'd like [[User:SomeoneIGuess|someone, i guess]]([[User talk:SomeoneIGuess|talk i guess]]|[[Special:Contributions/SomeoneIGuess|le edit list]]) 23:20, 4 December 2023 (UTC)

I assume brackets around (i) are for the Saturn's rings? [[Special:Contributions/162.158.102.71|162.158.102.71]] 23:26, 4 December 2023 (UTC)
:Ooh, good call. Put that in. [[User:LtPowers|LtPowers]] ([[User talk:LtPowers|talk]]) 13:22, 5 December 2023 (UTC)
:I assumed it was just a way to emphasize the i. In the comic, they are bolded, but that is not possible in title text. - [[Special:Contributions/172.68.27.133|172.68.27.133]] 22:28, 5 December 2023 (UTC)

The long, rambling diatribe about literature seemed odd at first, but I think Charlotte Brontë would be proud she was able to represent Pluto and Charon. [[Special:Contributions/172.69.247.56|172.69.247.56]] 04:07, 5 December 2023 (UTC)
:I don't understand. What's this about Charlotte Brontë? I don't see any reference to her in this comic.[[Special:Contributions/162.158.155.112|162.158.155.112]] 20:17, 5 December 2023 (UTC)

For what it's worth, the asteroid belt spans the area covered by the word "measure" [[Special:Contributions/172.71.222.152|172.71.222.152]] 14:10, 5 December 2023 (UTC)
:It would be nice if the word gaps were aligned that way, but there is no obvious alignment with either the edges of the asteroid belt, or the location of the Kirkwood gaps. The asteroid belt would stretch from the middle of the M in "measure" to the P in "space", with the most prominent Kirkwood gaps corresponding roughly to the letters A, R and E. [[User:Rexon Mobile|Rexon Mobile]] ([[User talk:Rexon Mobile|talk]]) 15:33, 5 December 2023 (UTC)
:If he really wanted to represent the asteroids, I think he might have found a way to include a word like "riiii[...]iiight" so there would be lots of dots. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:51, 5 December 2023 (UTC)

I added the table with the count of 'e's and adjusted the wording where it said 85 'e's from the Sun to say an extra 13 'e's in the word "here". I worked this out using an image from Wikipedia (https://en.wikipedia.org/wiki/Solar_System#/media/File:Solar_System_distance_to_scale.svg) in PowerPoint but don't have upload privileges to post. Would be nice if someone could do that. [[User:Denver87|Denver87]] ([[User talk:Denver87|talk]]) 15:30, 5 December 2023 (UTC)

Amazingly (assuming my math was right so please someone check) the sun to scale would be very close to the size of the actual dots used to represents the planets. (Planets wouldn't be visible.)

I don't see why the mnemonic for the order of the planets would be relevant to this comic. Should it be removed? [[User:Rexon Mobile|Rexon Mobile]] ([[User talk:Rexon Mobile|talk]]) 17:40, 5 December 2023 (UTC)
: Absolutely. No relevance to the comic. removed [[User:SomeoneIGuess|someone, i guess]]([[User talk:SomeoneIGuess|talk i guess]]|[[Special:Contributions/SomeoneIGuess|le edit list]]) 18:18, 5 December 2023 (UTC)
:: I put it in because it was another mnemonic about the solar system. [*shrug*] [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 19:59, 5 December 2023 (UTC)

== what if? news! ==

I can't find it anywhere here, but there is now an official what if youtube channel with (currently) two videos uploaded! Also, I think the most recent one *isn't* a duplicate of one already covered in other what if? media! (yeah i know this isnt related to the comic but this is where people will see it)[[Special:Contributions/162.158.175.61|162.158.175.61]] 23:38, 5 December 2023 (UTC)Bumpf

Talk:2817: Electron Holes

2023-08-19T05:11:01Z

162.158.175.61: Thoughts on quasiparticle beams...

I must admit... I'm not entirely convinced that one _couldn't_ build an electron hole beam. It would probably be called a quasibeam, but I think it could be done.

[[Special:Contributions/162.158.175.61|162.158.175.61]] 05:11, 19 August 2023 (UTC)