explain xkcd - User contributions [en]

1161: Hand Sanitizer

2013-01-17T10:49:41Z

62.25.36.19: /* Transcript */

{{comic
| number = 1161
| date = January 16, 2013
| title = Hand Sanitizer
| image = hand sanitizer.png
| titletext = Hipster CDC Reports Flu Epidemic Peaked Years Ago
}}

==Explanation==
The number of germs that would be left after using the hand sanitizer is 200 million times 0.01%. 0.01% is equivalent to .0001 decimal, so the simple equation is 200000000 x .0001. That equals 20 thousand germs, which is still a surprisingly large number of germs.

Side note - Recently scientists have shown that it only takes 20 virus particles to infect someone [http://www.dailymail.co.uk/sciencetech/article-2257098/Larry-projectile-vomiting-robot-helping-British-team-learn-stop-spread-norovirus.html] (with analyzed virus: not all germs are equally effective).

"Hipster CDC" is a combination of the acronym for the {{w|Centers for Disease Control and Prevention}}, an organization dedicated to studying infectious diseases and limiting their spread, with the label {{w|Hipster (contemporary subculture)|hipster}}. Hipsters form a cultural group associated with a distaste for popular culture; they stereotypically talk about how bands, authors, etc... were better before they went "mainstream" and proclaim that they liked a certain thing "before it was cool".

In this case, the period when the flu epidemic was "better" is probably 1918, when a {{w|1918 flu epidemic|world-wide flu epidemic}} killed tens of millions..

The humor (if a worldwide disaster can be said to be humorous) is in the dual use of the word "epidemic". The current mainstream news media is making a big thing of an up-surge in flu cases this season, sometimes calling it an "epidemic". The comic points out that, in reality, the worldwide flu epidemic is an on-going, multi-year thing, and the current seasonal up-surge is tiny and uninteresting in comparison to previous surges.

==Transcript==
:Poster: An invisible sneeze droplet can contain ''200 million'' germs!
:Product label: Our hand sanitizer kills 99.99% of germs!
:Cueball (typing on calculator): 200 000 000 × 0.01% =
:Cueball: Ew.

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

Talk:1160: Drop Those Pounds

2013-01-15T17:16:01Z

62.25.36.19:

"Dropping Thirty Pounds Fast"? Is that a reference to the projectile weight being approx 30lb and "dropping" it on someone's walls? [[User:DreamingDaemon|DD]] ([[User talk:DreamingDaemon|talk]]) 10:03, 14 January 2013 (UTC)
:I was thinking more along the lines of thirty pounds of blood and dismembered flesh. '''[[User:Davidy22|Davidy22]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 10:46, 14 January 2013 (UTC)

A trebuchet works by dropping a large weight connected to the swing arm, thereby propelling the projectile in a parabola (hopefully) towards the target. Thus, by dropping 30 lbs fast, you may literally hit your target. {{unsigned|‎62.109.36.140}}

:Anyhow the explanation is a little off. The "subtlety" referred to is not that people tend to ignore weight loss flyers. It is that the flyer ''looks'' like a flyer for a weight loss programme, while it is actually trying to recruit people for something entirely different. Most people would not get this and sign up thinking that they would lose body weight, while they would be signing up for the trebuchet club. The only hint is the drawing, really. I agree with the above comment that the "dropping 30lbs" probably refers to the projectile. [[Special:Contributions/62.25.36.19|62.25.36.19]] 10:52, 14 January 2013 (UTC)

::Actually - I didn't mean that the 30lbs was the projectile but rather the counterweight propelling the projectile. [[Special:Contributions/62.109.36.140|62.109.36.140]] 12:53, 14 January 2013 (UTC)

My vote is that 30lbs stands for the projectile. [[Special:Contributions/70.31.159.230|70.31.159.230]] 15:55, 14 January 2013 (UTC)

30lbs for the projectile is most consistent with the alt-text, which implies that they will be hurling projectiles at the town. A 30lbs counterweight would only be able to fling a projectile an order of magnitude smaller. Also, for medieval trebuchets the "average mass of the projectiles was probably around 50–100 kg" ([http://en.wikipedia.org/wiki/Trebuchet#Counterweight_trebuchet Wikipedia article]) --[[User:Forlackofabettername|Forlackofabettername]] ([[User talk:Forlackofabettername|talk]]) 16:23, 14 January 2013 (UTC)

:A trebuchet club would likely be building smaller models than the original medieval ones, so my vote is the 30lbs is referring to the counterweight, not the projectile. In a trebuchet, the counterweight drops fast, whereas the projectile doesn't initially drop at all, but it rather launches upwards and sideways; it'll be some time before it starts dropping, and even then not very quickly as the vertical speed takes some time to switch from up to zero, and then finally down, eventually building up speed to something that might be considered "FAST". But the "FAST" is mostly in the horizontal direction rather than seen as a "drop". In the meantime, that counterweight had already dropped more directly a long time ago. --boB

::Even the projectiles will take more to drop, it still quite "FAST" compare any weight loss program, so I think it can still refer to the projectile. [[User:Arifsaha|Arifsaha]] ([[User talk:Arifsaha|talk]]) 18:17, 14 January 2013 (UTC)

:::I can just imagine someone from the club saying "Let's drop 30 lbs on the target". Besides, I'd consider the usage of the word "drop" to be more metaphorical because in the operation of a trebuchet, no individual actually drops a counterweight; they simply pull a pin or cut a rope. [[Special:Contributions/70.31.159.230|70.31.159.230]] 20:54, 14 January 2013 (UTC)

A what-if wonder: considering a {{w|trebuchet}} is a {{w|weapon}}, will it be legal to own and place a {{w|trebuchet}} in your own {{w|backyard}}? [[User:Arifsaha|Arifsaha]] ([[User talk:Arifsaha|talk]]) 18:20, 14 January 2013 (UTC)
: The art of [http://www.amazon.com/dp/1613740646 backyard ballistics] is a firmly established niche hobby -- presumably for people with really big backyards. --[[User:Prooffreader|Prooffreader]] ([[User talk:Prooffreader|talk]]) 20:22, 14 January 2013 (UTC)
:: I needed a new hobby since I broke the last one... this is a contender! Thanks! :D [[User:DreamingDaemon|DD]] ([[User talk:DreamingDaemon|talk]]) 16:42, 15 January 2013 (UTC)

This might be example of '''literal''' vs '''figurative''' meaning: for trebuchet it is literally dropping counterweight and literally hitting a target. --[[User:JakubNarebski|JakubNarebski]] ([[User talk:JakubNarebski|talk]]) 17:06, 15 January 2013 (UTC)

Thanks for finally turning my temporary text into a proper explanation :) [[Special:Contributions/62.25.36.19|62.25.36.19]] 17:16, 15 January 2013 (UTC)

1160: Drop Those Pounds

2013-01-14T14:10:43Z

62.25.36.19: /* Explanation */ Clarified the explanation a bit.

{{comic
| number = 1160
| date = January 14, 2013
| title = Drop Those Pounds
| image = drop those pounds.png
| titletext = If the flyers don't work, we'll switch to the LEAST subtle method of informing a town of the existence of a trebuchet club.
}}

==Explanation==

The comic presents a flyer with a text typically found in an advertisement for a "Weight Loss Program", but instead it announces a trebuchet club in a subtle way.
A {{w|trebuchet}} is a large catapult, invented in medieval times to attack castles, that works by dropping a raised counter weight to rotate the throwing arm. Hence the 'drop thirty pounds fast' doesn't refer to losing body weight, but rather to dropping the counter weight to launch the projectile.

The only hint that the flyer advertises a trebuchet club is in the drawing at the bottom of the flyer. The subtitle indicates that this hint "may have been too subtle". The title text suggest they will announce the existence of the trebuchet club by the least subtle way: attacking the city with a trebuchet.

==Transcript==
:[Poster with drawing of Megan and Cueball in bottom left corner, castle in bottom right corner and a curved line between them. On the poster is some large text.]
:Struggling with those 2013 resolutions?
:We'll help you hit hit your target
:By dropping thirty pounds '''fast'''
:[Small print.]
:Web: http:// [Illegible] .com
:Call: [Illegible.]

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

Talk:1160: Drop Those Pounds

2013-01-14T10:52:26Z

62.25.36.19: