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This comic starts out with a three effects of high altitude related to the air getting "thinner" and the lower air pressure.
- Water boils at 202 degrees F (94 degrees C), slightly lower than the baseline 212 degrees F (100 degrees C) it takes at sea level, due to the lower air pressure.
- Baseballs and golf balls fly slightly farther due to the lower air resistance.
- Sunburn develops faster due to the decreased atmosphere filtering out harmful rays.
As usual for xkcd, the effects of high altitude are extended in a comical absurd manner degenerating into applying this "slightly less" rule to everything:
- Scrabble is a board game where each letter is assigned a point value based on its frequency of use in the edition's language. The comic claims all letters are worth 16% more (about 2 points more if applied to the shown "Q" tile) implying that the edition of Scrabble used at higher altitude is designed for dialects where uncommon letters are used even less frequently. The normal values for the Scrabble tiles Q, X, and Y are 10, 8 and 4, respectively.
- A common superstition states that breaking a mirror causes 7 years of bad luck. The comic claims that at higher altitudes, only 5½ years are caused. It is unclear whether this implies that people living at higher altitudes have more or less luck.
- Marketing campaigns will often state "X is the new Y" to draw the audience of Y in toward the newer X. When used with age, usually at 10 year intervals ("40 is the new 30" is the slogan referenced), it is an attempt to convince an older audience that they can share in an experience commonly associated with a younger audience. At higher elevations, the comic claims, people can use or do things designated for an even younger audience
- German band Nena's hit 99 Luftballons (99 Red Balloons in the English translation) is a song about a global nuclear war started by a large clump of balloons, taken to be a UFO. The comic affirms that, if launched from a higher altitude, 94 balloons would have sufficed.
- 4:20 is a code word for cannabis and has evolved in some circles to be the socially acceptable hour to consume cannabis. This has in turn evolved into a joke that when checking the time and finding it is exactly 4:20, people will add "blaze it" as a reference. The comic claims that, at higher altitudes, the socially acceptable time decreases, so if there is an elevation of one mile, the socially acceptable time would be 4:17 and therefore, marijuana jokes are made earlier. This joke is probably related to the legalization of recreational marijuana use in Colorado.
- Referenced in the title text, One Hundred and One Dalmatians is a children's book and Disney franchise based on it, where the villain, Cruella de Vil, aims to capture and kill 99 Dalmatian puppies to have the perfect spotted fur coat (the title comes from adding to them the two that try to save them). The comic claims that, at a higher altitude, she would only have needed 89, possibly implying that puppies at higher altitudes are bigger.
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I don’t even know where to begin. “That Guy from the Netherlands” (talk) 18:00, 22 May 2019 (UTC)
- Is that because in the netherlands you do not have any experience with the effects of high altitude? --Lupo (talk) 08:10, 23 May 2019 (UTC)
Can anyone verify if the baseballs and golf balls actually fly further? I'd assume it's due to lower air density and therefore resistance, not weaker gravity as someone else had written. Cgrimes85 (talk) 18:13, 22 May 2019 (UTC)
- Both parts (air resistance and gravity) play a role here. 184.108.40.206 18:17, 22 May 2019 (UTC)
- At 1 mile altitude the acceleration due to gravity is only about 0.05% less than at sea level, so I don't think it's important relative to the lower air resistance. Cgrimes85 (talk) 18:53, 22 May 2019 (UTC)
- The difference in gravity due to being 1 mile farther away from the center of the earth is negligible and due to having more mass(aka mountains) under them Denver actually has a slightly higher Local Gravitational Acceleration at 9.81112m/s^2 than say Los Angeles at 9.80636m/s^2. wolfram alpha source Decreased air resistance is the reason for flying further. Stickfigurefan (talk) 19:21, 22 May 2019 (UTC)
- Note however that the spin-induced lift would be lower in the thinner air which would somewhat counteract the reduced gravity and air drag.220.127.116.11 12:40, 23 May 2019 (UTC)
- This is a fairly commonly recognized phenomenon. Many golf publications reference this. e.g. Titleist postOhFFS (talk) 21:20, 22 May 2019 (UTC)
- This is also commonly recognized in baseball. For example, [this paper argues that after the spin-induced lift reduction ball will still fly 5% farther in Denver than in Boston due to altitude.18.104.22.168 14:08, 23 May 2019 (UTC)
- Considering the negligible effect of gravity on balls distances (and boiling temperatures and sunburns for that matter), should we not just remove any references to gravity from the main explanation?22.214.171.124 09:34, 24 May 2019 (UTC)
I'd say the last frame is a reference to 5 o'clock time for drinks. On urban dictionary there's a reference to 4:20 being the time to 'smoke the reefer' Palmpje (talk) 18:17, 22 May 2019 (UTC)
- It's definitely about weed, not liquor. See Wikipedia article on 420. Barmar (talk) 18:36, 22 May 2019 (UTC)
- The frame says it's about marijuana. How is this one in question? OhFFS (talk) 21:21, 22 May 2019 (UTC)
Although the comic relates to nuclear war neither the original German text nor the English reworked text (it's definitely not a direct translation) refer to nuclear war. Both refer to unidentified objects however so I've adapted the explanation to that end. Palmpje (talk) 19:18, 22 May 2019 (UTC)
- There appears to be some debate around the UFOs. In my opinion the original German text should prevail (I'm Dutch, not German). The original lyrics state "hielt man für UFO's aus dem All"
which means "thought they were UFOs from space". The English lyrics are not that definite. Anyway - a large 99 (or is it 94 at altitude?) year war broke out just because of some hyper-tense generals. Palmpje (talk) 19:45, 22 May 2019 (UTC)
- The comic refers to "red" balloons, which which are only present in the English version. The original German text doesn't mention the color of the "Luftballons", so it's not so obvious that this version should prevail.126.96.36.199 13:47, 23 May 2019 (UTC)
Re: Nena: Currently listening to the English version. It does stick out somewhat that it is about "99 RED Baloons" -- Red Scare possibly involved in the translation? Also, both versions refer to Cptn. Kirk, who is infamous for his rather aggressive negotiation-techniques. sba
The "420" mile marker on Interstate 70 in Colorado was replaced by a "419.99" marker because it kept getting stolen. . Probably not Douglas Hofstadter (talk) 14:46, 23 May 2019 (UTC)
Re: 101 Dalmatians: in the book there are 97 puppies and 4 adults (Pongo, Missis, Perdita and Prince), simplified in the film to 99 + 2.
13:16, 24 May 2019 (UTC)
- I noticed that, too, and fixed it with some parentheticals. I've noticed such level of detail is normal in these explanations. Trlkly (talk) 04:41, 26 May 2019 (UTC)
The Scrabble tiles' new scores aren't 16% higher. 4 > 5 is +25%, 8 > 9 is +12.5%, 10 > 12 is +20%. It seems that Randall rounded to the nearest whole number. These Are Not The Comments You Are Looking For (talk) 05:20, 27 May 2019 (UTC)