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Latest revision as of 09:47, 15 May 2015

Welcome to the explain xkcd wiki!
We have an explanation for all 1536 xkcd comics, and only 21 (1%) are incomplete. Help us finish them!

[edit] Latest comic

Go to this comic explanation

The BDLPSWDKS Effect
This well-known effect has of course been replicated in countless experiments.
Title text: This well-known effect has of course been replicated in countless experiments.

[edit] Explanation

The BDLPSWDKS Effect in the title is an acronym for Bernoulli-Doppler-Leidenfrost-Peltzman-Sapir-Whorf-Dunning-Kruger-Stroop Effect, as explained by Ponytail in the comic. She stands in front of a slide that shows Cueball being subjected to this effect.

The effect mentioned appears to be a mashup of seven scientific principles (with nine scientists names included) from different scientific fields, with elements from each principle appearing in the resulting description of the effect:

  • Bernoulli's principle in fluid dynamics (also mentioned in 803: Airfoil) states that an increase in the speed of a fluid with certain properties occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
    • This is referenced by the firetruck lifting off and hurtling.
  • The Doppler effect in physics refers to the change in a wave's frequency for an observer moving relative to its source. Sound from the oncoming firetruck increases in pitch.
    • This is referenced by Cueball reacting faster if the shouting is in a non-tonal language than a tonal language. In tonal languages, changes in pitch change the meaning, thus tonal langauges may suffer more from Doppler distortion than non-tonal ones.
  • The Leidenfrost effect refers to how liquid will produce an insulating vapor layer when in near contact with an extremely hot surface, causing it to hover over said surface.
    • This is referenced by the firetruck lifting off on a layer of superheated gas.
  • The Peltzman effect refers to how regulations intended to increase safety are ineffective or counterproductive because people, feeling safer, will engage in riskier behaviours.
    • This is referenced by the firefighter speeding due to the feeling of safety he/she has in a modern firetruck, subsequently creating a hazardous situation and reducing the safety of the pedestrian.
  • The Sapir–Whorf hypothesis states that a person's world view and cognitive processes are affected by the structure of the language the person speaks.
    • This is referenced by languages with a word for "firefighter" giving a quicker reaction. If Cueball speaks (or is currently thinking in) a language without a word for "firefighter", he might be slower to recognize the role and authority of the driver warning him, and thus slower to react to the danger.
  • The Dunning–Kruger effect refers to unskilled people mistakenly perceiving themselves as more skilled than they really are, while skilled people underestimate their own abilities.
    • This is referenced by the tonal language being a language Cueball thinks he is fluent in but isn't.
  • The Stroop effect refers to the phenomenon in which it is easier to name the color of the ink in which a word is written when the word refers to the same color as the ink than when the word refers to a different color.
    • This is referenced by Cueball diving out faster if the driver screams "red!" than if the driver screams "green!", as the firetruck is red and therefore it may create a moment of confusion for Cueball if the driver shouts "green!".

The punchline is how utterly inconsequential the tested variable (exact content of a shouted warning) might seem in light of the severity of the situation (the driver is warning someone who is about to be run over by a speeding vehicle), as well as the implicitly-convoluted thought process that would have gone into even wanting to test the variable.

Usually, for an effect to be considered real, the scientific method requires the effect to be replicated by different experimenters in different times and places. It is hard to imagine several scientists in different parts of the world creating the setup to replicate this effect; however the title text mentions (maybe sarcastically) it has been done countless times.

Furthermore, the opportunity of publishing this comic strip may (or may not) be related to the recently issued sequels of franchises such as `Mad Max` and `Carmageddon`, where it's not unusual to find heavy wheeled vehicles trampling pedestrians for fun, or simply because the drivers do not care.

[edit] Transcript

[Ponytail stands next to a screen displaying a firetruck hurtling toward Cueball on what appears to be a layer of gas.]
Ponytail: The Bernoulli-Doppler-Leidenfrost-Peltzman-Sapir-Whorf-Dunning-Kruger-Stroop Effect states that if a speeding fire truck lifts off and hurtles towards you on a layer of superheated gas, you'll dive out of the way faster if the driver screams "red!" in a non-tonal language that has a word for "firefighter" than if they scream "green!" in a tonal language with no word for "firefighter" which you think you're fluent in but aren't.


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[edit] New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • There are incomplete explanations listed here. Feel free to help out by expanding them!
  • We sell advertising space to pay for our server costs. To learn more, go here.

[edit] Rules

Don't be a jerk.

There are a lot of comics that don't have set in stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to (and helping everyone better understand) xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, post a message to the Admin requests board.

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