this post was submitted on 05 May 2025
39 points (100.0% liked)

Ask Lemmy

31464 readers
2017 users here now

A Fediverse community for open-ended, thought provoking questions


Rules: (interactive)


1) Be nice and; have funDoxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them


2) All posts must end with a '?'This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?


3) No spamPlease do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.


4) NSFW is okay, within reasonJust remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either [email protected] or [email protected]. NSFW comments should be restricted to posts tagged [NSFW].


5) This is not a support community.
It is not a place for 'how do I?', type questions. If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email [email protected]. For other questions check our partnered communities list, or use the search function.


6) No US Politics.
Please don't post about current US Politics. If you need to do this, try [email protected] or [email protected]


Reminder: The terms of service apply here too.

Partnered Communities:

Tech Support

No Stupid Questions

You Should Know

Reddit

Jokes

Ask Ouija


Logo design credit goes to: tubbadu


founded 2 years ago
MODERATORS
 

Do you or have you ever use thought experiments to some practical end?

top 19 comments
sorted by: hot top controversial new old
[–] [email protected] 3 points 5 hours ago

I was influenced greatly by Robert Axelrod's short essay about the Prisoner's Dilemma titled "The Prisoner's Dilemma Computer Tournaments and the Evolution of Cooperation" (link PDF warning)

tl;dr The essay explores an iterative game of Prisoner's Dilemma, and demonstrates how cooperation can emerge from a group of self interested participants. It has implications for the statistical emergence of morality, and even remarks on politics.

[–] [email protected] 1 points 5 hours ago* (last edited 5 hours ago)

My favorite is probably Russell's teapot, but Daniel Dennett had some good ones in the intuition pump book too.

https://en.wikipedia.org/wiki/Russell's_teapot

It demonstrates the burden of proof is on the person making claims, including if the claim is unfalsifiable.

[–] [email protected] 3 points 7 hours ago

the practicality part reminded me of the ring of gyges.

the thought experiment kinda goes like "if a rational, intelligent being (you) own a ring that lets you do whatever you want without anybody noticing and you will not suffer any negative consequences for it, would you use it strictly for the sake of good?". this is somewhat famous/popular as it was supposedly taken as inspiration to the lord of the rings book.

[–] [email protected] 13 points 22 hours ago (1 children)

The Chinese Room thought experiment is extremely relevant to what's going on in the world today, https://plato.stanford.edu/entries/chinese-room/

I first read about it in Blindsight, a fantastic sci-fi novel by Peter Watts. (Unrelated, I also highly recommend Starfish by him as well).

So now imagine someone asks, "Do you like dogs?" and out pops the answer, "No, I hate them." The worker inside the thought experiment room has no idea the question that was asked nor the answer that was given and it could very well run counter to their own opinions. The answer may come from bias in the initial data, or just the person who wrote the book of rules and decided to put their thumb on the scales. PLEASE stop trusting AI for literally anything, it is less than worthless, it is actively harmful.

[–] [email protected] -2 points 22 hours ago

Before I read the link, I wanna guess that its saying the common people laboring for whatever horrible business are oppressed or forced by economic circumstance to labor towards evil while the owners get the good life and the presumed gentile-ness that belies the source of their influence and resources

[–] [email protected] 9 points 22 hours ago (3 children)

https://en.m.wikipedia.org/wiki/Olbers%27s_paradox

Olbers's paradox, also known as the dark night paradox or Olbers and Cheseaux's paradox, is an argument in astrophysics and physical cosmology that says the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.

The night sky being dark has some profound cosmological implications.

[–] [email protected] 5 points 14 hours ago

The answer is very simple. Our universe is very likely not static. We already know that it is expanding (as of today). The further you look in space, the faster that space is moving from us. This causes more and more redshift of light the further you look away (the wavelength of light becomes longer and longer).

Beyond a certain point, space moves faster than the speed of light. Thus, we get no light.

[–] [email protected] 7 points 18 hours ago

With the Hubble Deep Field, they pointed the telescope at a seemingly empty patch of night sky - and it turned out to be filled with distant galaxies. Also, light traveling from far enough away gets redshifted into the infrared range, which means it can no longer be seen by the human eye.

[–] [email protected] 2 points 22 hours ago (1 children)

Why? Doesnt that just mean absence of light or somethijt?

[–] [email protected] 3 points 19 hours ago (1 children)

Yes. But why is there an absence of light?

If there are infinite stars, then every direction you look would encounter a star. (Things stay the same brightness per subtended angle as they get far away. Space dust doesn't matter, as it would thermalize and radiate.)

So, the universe can't have infinite luminous matter, be static and ageless, because if it were then the night sky would look like the surface of a sun.

This may all seem obvious, but it's neat that you can figure that out with the naked eye.

[–] [email protected] 2 points 19 hours ago (1 children)

Can't we see stars that do not show up in the night sky? Like that spot looks dark to the naked eye, with a hobby telescope it looks dark, but with a space probe telescope you can see a distant star is there?

You discounted space dust. But there has to be a near infinite amount of asteroids out there. If I wanted to see 1m lightyears into a specific spot, like the odds of not hitting an astroid would be pretty hard.

Like if you had a Lite Brite globe with each Lite Brite peg representing a sun. In the middle of the globe it would be completely lit up. However, if you started throwing around astroids around inside the globe, you'd start blocking pegs. Suns, pegs, are still behind the astroid. It's just blocking the light. A tiny astroid could cast a huge shadow. Even tiny space dust.

[–] [email protected] 1 points 11 hours ago (1 children)

You discounted space dust.

No I didn't


it would thermalize and radiate.

This is not my paradox, and it's not really a paradox at all, as the big bang model explains it nicely. There are many nice articles on the topic of you'd like to read more about it.

[–] [email protected] 2 points 6 hours ago

I'm not trying to disprove you or anything, I know it's not your paradox. Apologies that it came off that way.

But like a tiny flake of space dust is enough to eclipse a sun for us a near infinite distance away. Matter is not going to let light through it. Even if some space dust thermalizes and radiates. The chances something like an asteroid, planet, moon, etc. Is high. Space seems mostly void, but an infinite amount of mostly void is still a lot of stuff.

I'll check then out!

[–] [email protected] 13 points 1 day ago (1 children)

One of my favorites is the "ladder paradox" in special relativity, although I originally learned is as a pole vaulter rather than a ladder:

A pole vaulter is running carrying a pole that is 12m long at rest, holding it parallel to the ground. He is running at relativistic speed, such that lengths dilate by 50% (this would be (√3/2)c). And he runs through a barn that is 10m long that has open doors in the front and back.

Imagine standing inside barn. The pole vaulter is running so fast that the length of the pole, in your frame of reference, has contracted to 6m. So while the pole is entirely inside the barn you press a button the briefly closes the doors, so that for just a moment the pole is entirely closed inside the barn.

The question is, what does the pole vaulter see? For him, the pole has not contracted; instead the barn has. He's running with a 12m pole through what, in his frame of reference, is a 5m barn. What happens when the doors shut? How can both the doors shut?

I will admit that I have never used this thought experiment for any practical end.

[–] [email protected] 10 points 23 hours ago* (last edited 21 hours ago)

For those who haven't studied relativity, this thought experiment is great at showing the "Relativity of Simultaneity".

The only way the doors can shut from the pole vaulter's reference frame is if they close at different times. The exit door opens and shuts first, before the tip of the pole has gone beyond it (otherwise it would hit the door, obviously), and then later, only once the back end of the pole has cleared the entrance door, does it close.

[–] [email protected] 9 points 1 day ago* (last edited 1 day ago) (3 children)

For me it is all about our senses & perception: how would you describe a colour to someone that has never seen? How would someone that has never seen describe their surroundings to you?

If we all percieve the world different how can all agree on things like colours? I mean what if you perceive the sky as green and me as pink but sience has thaught us these colour range has to be blue. So we go our whole life thinking green / pink is blue, due to people definding the reflexion /absorbtion of certain light waves as blue?

[–] [email protected] 3 points 17 hours ago

That's an interesting one. A blind person can easily describe things using the words they learnt, just like we do. A cube is still a cube even when you can't see it, because you can feel it so you can agree about its shape.

Color blindness is different. My friend is a graphical designer, and he chooses interesting and unusual color combos. He is red/green color blind; both look the same to him. (Fun aside: he is also a taxi driver.) Now, obviously red and green are components in the colors he uses, so what color does he actually see?

We cannot explain colors to each other because it is always in reference to some other color, which is also changed in his vision, and maybe not to the same degree as pure red or green. What color is an orange? We both know without looking, but his perception is different from mine. He would need to not be color blind to become able to describe to me how different he sees stuff.

[–] [email protected] 4 points 1 day ago

It's like, the subjective qualia of experience, what we call consciousness, there's no way to prove anyone else has it, or that they have it the same way you do. That they claim to have it doesn't mean they actually have an internal experience. Consciousness is one of the biggest mysteries of humanity

[–] [email protected] 2 points 1 day ago

If you had to be haunted by someone else forever, they are a ghost, cannot be more than a mile from you at all times, do not eat, sleep, or age, who would it be?