explain xkcd - User contributions [en]

Talk:1446: Landing

2014-11-12T06:58:41Z

Maths22:

I would bet money that this comic will have to do with the Rosetta Lander that will be landing on a comet for the first time in history this morning. Info about it at Rosetta.esa.int

[[Special:Contributions/108.162.237.173|108.162.237.173]] 05:37, 12 November 2014 (UTC)pH

Almost definitely. The URL for the image (http://imgs.xkcd.com/comics/landing/r_00-40-00_wmf0bPtxDN.png) contains 'landing'.

[[User:DeedleFake|DeedleFake]] ([[User talk:DeedleFake|talk]]) 05:44, 12 November 2014 (UTC)

The image changes every five minutes. (http://imgs.xkcd.com/comics/landing/r_00-35-00_lVC98SMY1X.png) followed by (http://imgs.xkcd.com/comics/landing/r_00-40-00_wmf0bPtxDN.png) followed by (http://imgs.xkcd.com/comics/landing/r_00-45-00_MZprhbADHL.png) then (http://imgs.xkcd.com/comics/landing/r_00-50-00_Z63bWhoaxd.png) (http://imgs.xkcd.com/comics/landing/r_00-55-00_2wCeCFN0R1.png) (http://imgs.xkcd.com/comics/landing/r_01-00-00_FRnIhqA5IZ.png) (http://imgs.xkcd.com/comics/landing/r_01-05-00_Os6SVGalch.png) (http://imgs.xkcd.com/comics/landing/r_01-10-00_xn4nUL9lry.png) http://imgs.xkcd.com/comics/landing/r_01-15-00_soIuPGfUYh.png , also I'm sorry about deleting other people's comments - firefox decided to not show the "other people have edited this" page :(. If anyone's interested, here's the command I'm using to grab the urls:
while :; do http --stream --body http://c0.xkcd.com/stream/comic/landing\?method\=EventSource | awk '/png/ { print $2 }' | perl -ne '/(r_.+png)/; print "$1\n";' ; done
where the 'http' command is from http://httpie.org - not the neatest way to do it, but it works ;)
[[User:Forkbomb|Forkbomb]] ([[User talk:Forkbomb|talk]]) 05:47, 12 November 2014 (UTC)

Forkbomb, you are not supposed to delete other's comments...
Yes. It is definitely about Rosetta. The image changed at 9.35 pm PST and it says "Three hours to separation", i.e. 12.35am PST, which is exactly the time at which PHILAE is going to separate...
[http://imgur.com/fK9Ddrx image_seen]
[http://blogs.esa.int/rosetta/2014/11/07/rosetta-and-philae-landing-timeline/ rosetta timeline]

[[Special:Contributions/199.27.128.237|199.27.128.237]] 05:50, 12 November 2014 (UTC)

Is anyone collecting URLs? I assume there's an easy automated way to do this that was used for Time. If not...

{| class="wikitable"
|-
! URLs
|-
|http://imgs.xkcd.com/comics/landing/r_01-05-00_Os6SVGalch.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-10-00_fUWUYNkxwp.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-15-00_74eSd3x7BQ.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-20-00_UT4FKycrmC.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-25-00_FX6hlfSQHR.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-30-00_FjnXADopvO.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-35-00_lVC98SMY1X.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-40-00_wmf0bPtxDN.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-45-00_MZprhbADHL.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-50-00_Z63bWhoaxd.png
|-
|http://imgs.xkcd.com/comics/landing/r_00-55-00_2wCeCFN0R1.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-00-00_FRnIhqA5IZ.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-05-00_Os6SVGalch.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-10-00_xn4nUL9lry.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-15-00_soIuPGfUYh.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-20-00_jwkPNMaOSf.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-25-00_ADajYkIBoR.png
|-
|http://imgs.xkcd.com/comics/landing/r_01-30-00_w819mZAIhE.png
|-
|https://sslimgs.xkcd.com/comics/landing/r_01-35-00_LoEc4Q8fJF.png
|-
|https://sslimgs.xkcd.com/comics/landing/r_01-40-00_YLKE5WV8Jw.png
|-
|https://sslimgs.xkcd.com/comics/landing/r_01-45-00_QRP5ndlY4A.png
|-
|https://sslimgs.xkcd.com/comics/landing/r_01-50-00_OAOxgR9UUR.png
|}

Randall switched to SSL after 1:30 but you can of course use either server.

- Marcustyphoon/[[Special:Contributions/108.162.219.244|108.162.219.244]] 06:53, 12 November 2014 (UTC)

(http://imgs.xkcd.com/comics/landing/r_00-45-00_MZprhbADHL.png) "Has anyone ever tried this before?" "No but fetishes have to start somewhere, right?" [[User:Nexxuz|Nexxuz]] ([[User talk:Nexxuz|talk]])

Probably just a mistake, but the transcript in the html source of 1446 is from 1445. --[[User:Pascal|Pascal]] ([[User talk:Pascal|talk]]) 05:58, 12 November 2014 (UTC)

It fetches things using this javascript tag..
<script type="text/javascript" src="/s/c3b919.js"></script>
I've pasted it in pastebin, can we get zealous and fetch the images before they actually show up ? :P
[http://pastebin.com/MwsahkyE link_to_javascript]
[[Special:Contributions/199.27.128.237|199.27.128.237]] 06:04, 12 November 2014 (UTC)

By the way, the current explanation says it's pinging c4.xkcd for updates.
From the javascript source, it looks like there's more than one server for this:
var SERVERS = ["http://c0.xkcd.com", "http://c1.xkcd.com", "http://c2.xkcd.com", "http://c3.xkcd.com", "http://c4.xkcd.com", "http://c5.xkcd.com", "http://c6.xkcd.com", "http://c7.xkcd.com"];
So that would be c0 to c7

Unfortuantely, as I had suggested, it seems that we cannot grab all the images beforehand :(
The javascript only fetches a json, which actually gives image name. So there's a server side script running which generates the paths to actual images. The javascript just shows it..
You can see the json [http://c4.xkcd.com/stream/comic/landing?method=EventSource here].
[[Special:Contributions/199.27.128.237|199.27.128.237]] 06:23, 12 November 2014 (UTC)

Attempting to load the URL directly in Firefox results in unreadable results, but it's something like
id: acae0462-6a34-11e4-8001-002590720087
event: comic/landing
data: {"image":"r_01-25-00_ADajYkIBoR.png","spread":1}
There are several other events as well, such as 'reload' and 'heartbeat'.
[[User:DeedleFake|DeedleFake]] ([[User talk:DeedleFake|talk]]) 06:32, 12 November 2014 (UTC)

By the way, that UUID (i.e. acae0462-6a34-11e4-8001-002590720087) seems to encode the time the image was uploaded as a v1 UUID.
[[User:Maths22|Maths22]] ([[User talk:Maths22|talk]]) 06:58, 12 November 2014 (UTC)

The best part of this is ninja-ing the image uploads. The xkcd servers seem to be off atomic time by around 45 seconds. [[User:Skylarmt|Skylarmt]] ([[User talk:Skylarmt|talk]]) 06:45, 12 November 2014 (UTC)

1446: Landing

2014-11-12T06:55:51Z

Maths22: Fixed links

{{comic
| number = 1446
| date = November 12, 2014
| title = ???
| image = ???.png
| titletext = ...
}}

==Explanation==
{{incomplete|Buckle up, boys.}}
This comic changes over time, tracking the progress of The [http://www.esa.int European Space Agency's] Rosetta Spacecraft Lander. Frames of the comic began appearing at midnight (EST) on November 12, 2014 and updated every five minutes.

==Frame by Frame Breakdown==
{| class="wikitable plainlinks table-padding"
|-
!Image
!Day/Time
|-
|[[Media:???.png|00:00:00]]||1/00:00:00
|-
|[[Media:???2.png|00:05:00]]||1/00:05:00
|-
|[[Media:???3.png|00:10:00]]||1/00:10:00
|-
|[[Media:???4.png|00:15:00]]||1/00:15:00
|-
|[[Media:???5.png|00:20:00]]||1/00:20:00
|-
|[[Media:???6.png|00:25:00]]||1/00:25:00
|-
|[[Media:???7.png|00:30:00]]||1/00:30:00
|-
|[[Media:???8.png|00:35:00]]||1/00:35:00
|-
|[[Media:???9.png|00:40:00]]||1/00:40:00
|-
|[[Media:???10.png|00:45:00]]||1/00:45:00
|-
|[[Media:???11.png|00:50:00]]||1/00:50:00
|-
|[[Media:???12.png|00:55:00]]||1/00:55:00
|-
|[[Media:???13.png|01:00:00]]||1/01:00:00
|-
|[[Media:???14.png|01:05:00]]||1/01:05:00
|-
|[[Media:???15.png|01:10:00]]||1/01:10:00
|-
|[[Media:???16.png|01:15:00]]||1/01:15:00
|-
|[[Media:???17.png|01:20:00]]||1/01:20:00
|-
|[[Media:???18.png|01:25:00]]||1/01:25:00
|-
|[[Media:???19.png|01:30:00]]||1/01:30:00
|-
|[[Media:???20.png|01:35:00]]||1/01:35:00
|-
|[[Media:???21.png|01:40:00]]||1/01:40:00
|-
|[[Media:???22.png|01:45:00]]||1/01:45:00
|-
|[[Media:???23.png|01:50:00]]||1/01:50:00
|-
|[[Media:???24.png|01:55:00]]||1/01:55:00
|-
|[[Media:???25.png|02:00:00]]||1/02:00:00
|-
|[[Media:???26.png|02:05:00]]||1/02:05:00
|-
|[[Media:???27.png|02:10:00]]||1/02:10:00
|-
|[[Media:???28.png|02:15:00]]||1/02:15:00
|-
|[[Media:???29.png|02:20:00]]||1/02:20:00
|-
|[[Media:???30.png|02:25:00]]||1/02:25:00
|-
|[[Media:???31.png|02:30:00]]||1/02:30:00
|-
|[[Media:???32.png|02:35:00]]||1/02:35:00
|-
|[[Media:???33.png|02:40:00]]||1/02:40:00
|-
|[[Media:???34.png|02:45:00]]||1/02:45:00
|-
|[[Media:???35.png|02:50:00]]||1/02:50:00
|-
|[[Media:???36.png|02:55:00]]||1/02:55:00
|-
|[[Media:???37.png|03:00:00]]||1/03:00:00
|-
|[[Media:???38.png|03:05:00]]||1/03:05:00
|-
|[[Media:???39.png|03:10:00]]||1/03:10:00
|-
|[[Media:???40.png|03:15:00]]||1/03:15:00
|-
|[[Media:???41.png|03:20:00]]||1/03:20:00
|-
|[[Media:???42.png|03:25:00]]||1/03:25:00
|-
|[[Media:???43.png|03:30:00]]||1/03:30:00
|-
|[[Media:???44.png|03:35:00]]||1/03:35:00
|-
|[[Media:???45.png|03:40:00]]||1/03:40:00
|-
|[[Media:???46.png|03:45:00]]||1/03:45:00
|-
|[[Media:???47.png|03:50:00]]||1/03:50:00
|-
|[[Media:???48.png|03:55:00]]||1/03:55:00
|}

==Transcript==
:00:35:00
:Three hours to separation
:00:45:00
:Has anyone ever tried this before?
:00:50:00
:I don't think so.
:01:25:00
:Ready to begin pre-delivery burn.

{{comic discussion}}
[[Category:Dynamic comics]]

1446: Landing

2014-11-12T06:54:26Z

Maths22: Extended template for 2 more hours.

{{comic
| number = 1446
| date = November 12, 2014
| title = ???
| image = ???.png
| titletext = ...
}}

==Explanation==
{{incomplete|Buckle up, boys.}}
This comic changes over time, tracking the progress of The [http://www.esa.int European Space Agency's] Rosetta Spacecraft Lander. Frames of the comic began appearing at midnight (EST) on November 12, 2014 and updated every five minutes.

==Frame by Frame Breakdown==
{| class="wikitable plainlinks table-padding"
|-
!Image
!Day/Time
|-
|[[Media:???.png|00:00:00]]||1/00:00:00
|-
|[[Media:???2.png|00:05:00]]||1/00:05:00
|-
|[[Media:???3.png|00:10:00]]||1/00:10:00
|-
|[[Media:???4.png|00:15:00]]||1/00:15:00
|-
|[[Media:???5.png|00:20:00]]||1/00:20:00
|-
|[[Media:???6.png|00:25:00]]||1/00:25:00
|-
|[[Media:???7.png|00:30:00]]||1/00:30:00
|-
|[[Media:???8.png|00:35:00]]||1/00:35:00
|-
|[[Media:???9.png|00:40:00]]||1/00:40:00
|-
|[[Media:???10.png|00:45:00]]||1/00:45:00
|-
|[[Media:???11.png|00:50:00]]||1/00:50:00
|-
|[[Media:???12.png|00:55:00]]||1/00:55:00
|-
|[[Media:???13.png|01:00:00]]||1/01:00:00
|-
|[[Media:???14.png|01:05:00]]||1/01:05:00
|-
|[[Media:???15.png|01:10:00]]||1/01:10:00
|-
|[[Media:???16.png|01:15:00]]||1/01:15:00
|-
|[[Media:???17.png|01:20:00]]||1/01:20:00
|-
|[[Media:???18.png|01:25:00]]||1/01:25:00
|-
|[[Media:???19.png|01:30:00]]||1/01:30:00
|-
|[[Media:???20.png|01:35:00]]||1/01:35:00
|-
|[[Media:???21.png|01:40:00]]||1/01:40:00
|-
|[[Media:???22.png|01:45:00]]||1/01:45:00
|-
|[[Media:???23.png|01:50:00]]||1/01:50:00
|-
|[[Media:???24.png|01:55:00]]||1/01:55:00
|-
|[[Media:???13.png|02:00:00]]||1/02:00:00
|-
|[[Media:???14.png|02:05:00]]||1/02:05:00
|-
|[[Media:???15.png|02:10:00]]||1/02:10:00
|-
|[[Media:???16.png|02:15:00]]||1/02:15:00
|-
|[[Media:???17.png|02:20:00]]||1/02:20:00
|-
|[[Media:???18.png|02:25:00]]||1/02:25:00
|-
|[[Media:???19.png|02:30:00]]||1/02:30:00
|-
|[[Media:???20.png|02:35:00]]||1/02:35:00
|-
|[[Media:???21.png|02:40:00]]||1/02:40:00
|-
|[[Media:???22.png|02:45:00]]||1/02:45:00
|-
|[[Media:???23.png|02:50:00]]||1/02:50:00
|-
|[[Media:???24.png|02:55:00]]||1/02:55:00
|-
|[[Media:???13.png|03:00:00]]||1/03:00:00
|-
|[[Media:???14.png|03:05:00]]||1/03:05:00
|-
|[[Media:???15.png|03:10:00]]||1/03:10:00
|-
|[[Media:???16.png|03:15:00]]||1/03:15:00
|-
|[[Media:???17.png|03:20:00]]||1/03:20:00
|-
|[[Media:???18.png|03:25:00]]||1/03:25:00
|-
|[[Media:???19.png|03:30:00]]||1/03:30:00
|-
|[[Media:???20.png|03:35:00]]||1/03:35:00
|-
|[[Media:???21.png|03:40:00]]||1/03:40:00
|-
|[[Media:???22.png|03:45:00]]||1/03:45:00
|-
|[[Media:???23.png|03:50:00]]||1/03:50:00
|-
|[[Media:???24.png|03:55:00]]||1/03:55:00
|}

==Transcript==
:00:35:00
:Three hours to separation
:00:45:00
:Has anyone ever tried this before?
:00:50:00
:I don't think so.
:01:25:00
:Ready to begin pre-delivery burn.

{{comic discussion}}
[[Category:Dynamic comics]]

1047: Approximations

2014-02-27T01:15:53Z

Maths22: Corrected Hitchhiker's question

{{comic
| number = 1047
| date = April 25, 2012
| title = Approximations
| image = approximations.png
| titletext = Two tips: 1) 8675309 is not just prime, it's a twin prime, and 2) if you ever find yourself raising log(anything)^e or taking the pi-th root of anything, set down the marker and back away from the whiteboard; something has gone horribly wrong.
}}

==Explanation==
{{incomplete|see discussion}}
This comic lists some approximations for numbers, most of them mathematical and physical constants. All of them work astonishingly well. There are reoccurring math jokes along the lines of, “3/5 + π/(7 – π) – √2 = 0, but your calculator is probably not good enough to compute this correctly”, which are mainly used to troll geeks.

Furthermore, there are some useful approximations (which were even more useful in times before calculators) such as “pi is approximately equal to 22/7”.

[[Randall]] makes fun of both of these, using rather strange approximations (honestly: you may handle 22/7, but who can calculate in a sensible way with 99^8, let alone 30^(pi^e)?) to calculate some constants that are easy enough to handle in the decimal system, and stating such “slightly wrong” trick equations, one of which ''is'' actually correct (which may astonish only those who are not familiar with cosines).

There are a few cultural references in this comic:

* 998 and 698 are sexual references.
* “Rent Method” refers to the song “Seasons of Love” from the musical “{{w|Rent (musical)|Rent}}.” The song asks, “How do you measure a year?” One line says “525,600 minutes” while most of the rest of the song suggests the best way to measure a year is moments shared with a loved one.
* (202) 456-1414 is the phone number for the White House switchboard. Truncated, Randall's formula yields 0.2024561414.
* Jenny's constant comes from Tommy Tutone's tune {{w|867-5309/Jenny}}. Randall's formula gives approximately 867.530901981685.
* {{w|42 (number)|42}} is, according to Douglas Adams' ''The Hitchhiker's Guide to the Galaxy'', the Answer to the Ultimate Question of Life, the Universe, and Everything.

And here are some of the mathematical and physical ones, with Wikipedia links.

* Informally, the {{w|Planck constant}} is the smallest action possible in quantum mechanics.
* The {{w|fine structure constant}} indicates the strength of electromagnetism. It is unitless and around 0.007297, close to 1/137. At one point it was believed to be exactly the reciprocal of 137, and many people have tried to find a simple formula explaining this (with a pinch of {{w|numerology}} thrown in at times), including the infamous {{w|Arthur Eddington|Sir Arthur Adding-One}}.
* In {{w|mathematics}}, the {{w|Euler-Mascheroni constant}} (Euler gamma constant) is a mysterious number describing the relationship between the {{w|Harmonic series (mathematics)|harmonic series}} and the {{w|natural logarithm}}.
* The {{w|gravitational constant}} relates to, uh, gravity.
* The {{w|gas constant}} relates energy to temperature in physics, as well as a gas's volume, pressure, temperature and {{w|mole (unit)|molar amount}} (hence the name).
* ϕ is the {{w|golden ratio}}, or (1 + √5)/2. It has many interesting geometrical properties.
* The ruby laser wavelength varies because “ruby” is not clearly defined.
* The {{w|Earth radios#mean radii|mean earth radius}} varies because there is not one single way to make a sphere out of the earth. Randall's value lies within the actual variation of Earth's radius.

The correct equation in the "Pro tip - Not all of these are wrong" section is cos(pi/7) + cos(3pi/7) + cos(5pi/7) = 1/2 as [http://math.stackexchange.com/questions/140388/how-can-one-prove-cos-pi-7-cos3-pi-7-cos5-pi-7-1-2 shown here]. If you're still confused, the functions use {{w|radians}}, not {{w|degrees (angle)|degrees}}.

The number 8675309 at the title text refers to the song 867-5309/Jenny as mentioned above, causing a fad of people dialing this number and asking for "Jenny". The number is in fact a {{w|twin prime}} because 8675311 is also a prime. Twin primes have always been a subject of interest, because they are comparatively rare, and because it is not yet known whether there are infinitely many of them.

{{w|Pi}} is a natural constant that arises in describing circles or ellipses. As such, useful as it may be, it doesn't usually occur anywhere in an exponent. When it does, such as with complex numbers, taking the pi-th root is rarely helpful. For example, if we try to derive:

''e''π''i'' + 1 = 0

''e''π''i'' = -1

(''e''''i'')π = -1

''e''''i'' = π√(-1)

We get nowhere.

Same goes for the e-th power: e typically appears in the basis of a power (forming the {{w|exponential function}}), not in the exponent. (This is later referenced in [Lethal Neutrinos http://what-if.xkcd.com/73/].

The software referred to in the comic is [http://mrob.com/pub/ries/ ries], a 'reverse calculator' which forms equations matching a given number.
:{| class="wikitable"
|-
| colspan="2" align="center" | Actual
| colspan="2" align="center" | Approximation
|-
| align="center" | One light year(m)
| align="center" | 9.46x1015
| align="center" | 998
| align="center" | 9.23x1015
|-
| align="center" | Earth Surface(m2)
| align="center" |
| align="center" | 698
| align="center" |
|-
| align="center" | Ocean's volume(m3)
| align="center" |
| align="center" | 919
| align="center" |
|-
| align="center" | Seconds in a year
| align="center" | 31557600
| align="center" | 754
| align="center" | 34640625
|-
| align="center" | Seconds in a year (rent method)
| align="center" | 31557600
| align="center" | 525,600 x 60
| align="center" | 31536000
|-
| align="center" | Age of the universe (seconds)
| align="center" |
| align="center" | 1515
| align="center" | 4.379x1017
|-
| align="center" | Planck's constant
| align="center" | 6.626x10-34
| align="center" | 1/(30πe)
| align="center" | 6.685x10-34
|-
| align="center" | Fine structure constant
| align="center" | 7.297x10-3
| align="center" | 1/140
| align="center" | 7.143x10-3
|-
| align="center" | Fundamental charge
| align="center" | 1.602x10-19
| align="center" | 3/(14 * πππ)
| align="center" | 1.599x10-19
|}

==Transcript==
{{incomplete transcript|this still needs some polishing}}
:'''A table of slightly wrong equations and identities useful for approximations and/or trolling teachers.'''
:(Found using a mix of trial-and-error, ''Mathematica'', and Robert Munafo's ''Ries'' tool.)
: All units are SI MKS unless otherwise noted.

:{| class="wikitable"
|-
| colspan="2" align="center" | Relation:
| align="center" | Accurate to within:
|-
| align="center" | One light year(m)
| align="center" | 998
| align="center" | one part in 40
|-
| align="center" | Earth Surface(m2)
| align="center" | 698
| align="center" | one part in 130
|-
| align="center" | Ocean's volume(m3)
| align="center" | 919
| align="center" | one part in 70
|-
| align="center" | Seconds in a year
| align="center" | 754
| align="center" | one part in 400
|-
| align="center" | Seconds in a year (rent method)
| align="center" | 525,600 x 60
| align="center" | one part in 1400
|-
| align="center" | Age of the universe (seconds)
| align="center" | 1515
| align="center" | one part in 70
|-
| align="center" | Planck's constant
| align="center" | 1/(30πe)
| align="center" | one part in 110
|-
| align="center" | Fine structure constant
| align="center" | 1/140
| align="center" | [I've had enough of this 137 crap]
|-
| align="center" | Fundamental charge
| align="center" | 3/(14 * πππ)
| align="center" | one part in 500
|-
| align="center" | White House Switchboard
| colspan="2" align="center" | 1 / 
π√(e(1 + (e-1)√8)
|-
| align="center" | Jenny's Constant
| colspan="2" align="center" | (7(e/1 - 1/e) - 9) * π2
|-
| colspan="3" align="center" | Intermission: World Population Estimate which should stay current for a decade or two: 
Take the last two digits of the current year

Example: 20[14]

Subtract the number of leap years since hurricane Katrina

Example:14 (minus 2008 and 2012) is 12

Add a decimal point

Example: 1.2

Add 6

Example: 6 + 1.2

7.2 = World population in billions.

Version for US population:

Example: 20[14]

Subtract 10

Example: 4

Multiply by 3

Example: 12

Add 10

Example: 3[22] million

|-
| align="center" | Electron rest energy
| align="center" | e/716 Joules
| align="center" | one part in 1000
|-
| align="center" | Light-year(miles)
| align="center" | 2(42.42)
| align="center" | one part in 1000
|-
| colspan="2" align="center" | sin(60°) = 3√/2 = e/π
| align="center" | one part in 1000
|-
| colspan="2" align="center" | √3 = 2e/π
| align="center" | one part in 1000
|-
| align="center" | gamma(Euler's gamma constant)
| align="center" | 1/√3
| align="center" | One part in 4000
|-
| align="center" | Feet in a meter
| align="center" | 5/(e√π)
| align="center" | one part in 4000
|-
| colspan="2" align="center" | √5 = 2/e + 3/2
| align="center" | one part in 7000
|-
| align="center" | Avogadro's number
| align="center" | 69π√5
| align="center" | one part in 25,000
|-
| align="center" | Gravitational constant G
| align="center" | 1 / e(pi - 1)(pi + 1)
| align="center" | one part in 25,000
|-
| align="center" | R(gas constant)
| align="center" | (e+1) √5
| align="center" | one part in 50,000
|-
| align="center" | Proton-electron mass ratio
| align="center" | 6*π5
| align="center" | one part in 50,000
|-
| align="center" | Liters in a gallon
| align="center" | 3 + π/4
| align="center" | one part in 500,000
|-
| align="center" | g
| align="center" | 6 + ln(45)
| align="center" | one part in 750,000
|-
| align="center" | Proton-electron mass ratio
| align="center" | e8 - 10 / ϕ
| align="center" | one part in 5,000,000
|-
| align="center" | Ruby laser wavelength
| align="center" | 1 / (12002)
| align="center" | [within actual variation]
|-
| align="center" | Mean Earth Radius
| align="center" | (58)*6e
| align="center" | [within actual variation]
|-
| colspan="3" align="center" | Protip - not all of these are wrong:
|-
| colspan="2" align="center" | √2 = 3/5 + π/(7-π)
| align="center" | cos(π/7) + cos(3π/7) + cos(5π/7) = 1/2
|-
| align="center" | γ(Euler's gamma constant) = e/34 + e/5
| align="center" | √5 = 13 + 4π / 24 - 4π
| align="center" | Σ 1/nn = ln(3)e
|}

{{comic discussion}}
[[Category:Charts]]
[[Category:Math]]
[[Category:Physics]]
[[Category:Protip]]

1240: Quantum Mechanics

2013-07-19T12:40:11Z

Maths22:

{{comic
| number = 1240
| date = July 19,2013
| title = Quantum Mechanics
| image = quantum_mechanics.png
| titletext = ''You can also just ignore any science assertion where 'quantum mechanics' is the most complicated phrase in it.''
}}

==Explanation==
''TBD''

==Transcript==
''TBD''

==Trivia==
''TBD''

{{comic discussion}}

File:quantum mechanics.png

2013-07-19T12:39:21Z

Maths22:

== Licensing ==
{{XKCD file}}