Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
3,899 replies · 248K views
Physics news on Phys.org
Jonathan Scott
Gold Member
- 2,358
- 1,273
The triple-decker bus is the "Knight Bus" from the Harry Potter movies; there is one which can be viewed at the Warner Bros Studio Harry Potter tour, where we took our children some years ago:jtbell said:
https://beingkinetic.com/2024/06/29/harry-potter-behind-the-scenes-the-knight-bus/
It doesn't look as if the inside would actually work.
pinball1970
Gold Member
2025 Award
- 3,867
- 6,204
That time of year. View from the office C.O. Katie B
Last edited:
Science Advisor
- 3,641
- 10,064
jtbell said:Are there any real triple-decker buses out there anywhere?
https://hoaxes.org/weblog/comments/a_brief_history_of_triple_decker_buses said:The idea of triple-decker buses has long been a popular theme in photo fakery, but in real life such monsters would face serious instability problems, and be at risk of hitting trees and bridges. But that's not to say that there have never been real-life triple deckers. There have been. Just not many.
The first real triple-decker bus went into service in 1932, shuttling up to 88 passengers at a time between Rome and Tivoli. But as the picture of it below shows (from Popular Mechanics, 1932), the third level was only a small section at the rear of the bus.
![]()
Science Advisor
Gold Member
- 2,396
- 5,234
That looks like the arrival of the ship in Independence Day.pinball1970 said:

DennisN
Gold Member
- 2,194
- 10,298
The first photograph of a human being (Open Culture)
https://www.openculture.com/2025/11/the-first-photograph-of-a-human-being-1838.html
The first selfie in history
https://www.openculture.com/2024/08...cornelius-a-philadelphia-chemist-in-1839.html
https://www.openculture.com/2025/11/the-first-photograph-of-a-human-being-1838.html
Article said:You’ve likely heard the reason people never smile in very old photographs. Early photography could be an excruciatingly slow process. With exposure times of up to 15 minutes, portrait subjects found it impossible to hold a grin, which could easily slip into a pained grimace and ruin the picture.
The first selfie in history
https://www.openculture.com/2024/08...cornelius-a-philadelphia-chemist-in-1839.html
Article said:As the Public Domain Review notes, the first recorded instance of the selfie harkens back to what may have been the first photographic portrait. In 1839, a young Philadelphia chemist named Robert Cornelius stepped out of his family’s store and took a photograph of himself...
Science Advisor
Homework Helper
- 3,447
- 3,713
DennisN said:The first photograph of a human being (Open Culture)
https://www.openculture.com/2025/11/the-first-photograph-of-a-human-being-1838.html
View attachment 367436
The first selfie in history
https://www.openculture.com/2024/08...cornelius-a-philadelphia-chemist-in-1839.html
View attachment 367437
I love photography and have for years. But I admit that the first time I learned about Robert Cornelius and deguarreotype portraits was actually from playing a video game. The video game is "Life is Strange."
DennisN
Gold Member
- 2,194
- 10,298
A few more...
Two autumn trees...
Two autumn trees...
sbrothy
Gold Member
- 1,874
- 1,540
Just used the word casually in another thread. Making sure I used the term correctly I looked it up on wiki and found this wonderful picture:
---- https://en.wikipedia.org/wiki/Sealioning
---- https://en.wikipedia.org/wiki/Sealioning
- 13,850
- 16,681
Do you have evidence that's a sealion?sbrothy said:Just used the word casually in another thread. Making sure I used the term correctly I looked it up on wiki and found this wonderful picture:
View attachment 367634
---- https://en.wikipedia.org/wiki/Sealioning
sbrothy
Gold Member
- 1,874
- 1,540
Actually I think you're right. Sealions are pretty fierce predators aren't they? They wouldn't be tamed as easily. I've seen them play with their prey on BBC - ripping the breasts off penguins (only thing containing any fat).BillTre said:I'm no expert, but sea lions are huge.
That might be a seal (no external ears).
- 13,850
- 16,681
Yeah - Wikipedia says they're 6-8 feet long, and I don't think that one's that big unless the guy is Andre the Giant. It's a nice meme about sealioning, but it's not scientifically accurate! (I think.)BillTre said:I'm no expert, but sea lions are huge.
That might be a seal (no external ears).
sbrothy
Gold Member
- 1,874
- 1,540
It's the language barrier doing a trick on me. Translating it to Danish the error is pretty obvious.
EDIT: Anway, it's a random picture so it qualifies!
EDIT: Anway, it's a random picture so it qualifies!

- 20,819
- 28,467
Your friendly AI says
Seals aren't all black as far as I know.The image is a meme featuring a sea lion and a textual overlay that reads, "itical views. Do you evidence to back your opinions?". The text is likely a cropped version of a larger message about political discourse.
sbrothy
Gold Member
- 1,874
- 1,540
Just goes to show what AI "knows".
EDIT: The powers that be are right to keep AI out of the STEM forums.
EDIT: The powers that be are right to keep AI out of the STEM forums.
- 20,819
- 28,467
But it is right, AI or not. This comes pretty close:sbrothy said:Just goes to show what AI "knows".
EDIT: The powers that be are right to keep AI out of the STEM forums.
https://de.wikipedia.org/wiki/Neuseeländischer_Seelöwe
sbrothy
Gold Member
- 1,874
- 1,540
Well, I'll be... OK. Hard to trust anything then.fresh_42 said:But it is right, AI or not. This comes pretty close:
https://de.wikipedia.org/wiki/Neuseeländischer_Seelöwe
- 13,850
- 16,681
Except that's supposed to be about 2.5m long, and the one in the photo is only 2.5m long on its online dating profile. Could be a juvenile, I suppose.fresh_42 said:But it is right, AI or not. This comes pretty close:
https://de.wikipedia.org/wiki/Neuseeländischer_Seelöwe
sbrothy
Gold Member
- 1,874
- 1,540
See, this is exactly why I want a trophy for geekiness instated. Where does this discussion end and who's sealioning who?Ibix said:Except that's supposed to be about 2.5m long, and the one in the photo is only 2.5m long on its online dating profile. Could be a juvenile, I suppose.

EDIT: "whom"? Yeah I think so. Unless there are special rules for plural forms.
- 13,850
- 16,681
In theory, it ends with a pinniped expert telling us. In practice, I need to leave the pub where I'm killing time in ten minutes.sbrothy said:See, this is exactly why I want a trophy for geekiness instated. Where does this discussion end and who's sealioning who?![]()
- 20,819
- 28,467
Could there be another reason he tries to engage in this pointless discussion?Ibix said:Could be a juvenile, I suppose.
sbrothy
Gold Member
- 1,874
- 1,540
I kinda felt that mentally.fresh_42 said:Could there be another reason he tries to engage in this pointless discussion?
Science Advisor
Gold Member
- 1,353
- 1,603
Why not? "Sealion" could just be a regular seal with a charge on it.Ibix said:Do you have evidence that's a sealion?
- 13,850
- 16,681
And sealioning is a negative behaviour - you may be on to something!renormalize said:Why not? "Sealion" could just be a regular seal with a charge on it.
Science Advisor
Homework Helper
- 3,447
- 3,713
BillTre said:I'm no expert, but sea lions are huge.
That might be a seal (no external ears).
It's a sea lion. Its ear flaps are small, very small (like [pretty much] all sea lions), but present.
https://becausetees.com/blogs/articles/sea-lions-vs-seals-what-are-the-differences-because-tees
sbrothy said:Actually I think you're right. Sealions are pretty fierce predators aren't they? They wouldn't be tamed as easily. I've seen them play with their prey on BBC - ripping the breasts off penguins (only thing containing any fat).
It's always a good idea to keep a good distance between yourself and the sea lion (or seal for that matter), but that's primarily done out of respect for the animal. They need their space, and humans in close proximity will stress them out. Don't go up and try to pet them. They may become aggressive. Just observe from a respectful distance.
But generally speaking, if you don't mess with them, they won't mess with you, and everybody gets along just fine.
fresh_42 said:Seals aren't all black as far as I know.
They can be, and sometimes are, all black.
renormalize said:Why not? "Sealion" could just be a regular seal with a charge on it.
Yes, the charge of the ionization creates an electrostatic force causing the ear flaps to pop out. (Kidding. I'm kidding!) Seriously though, that was pretty good.
------------
Here in San Diego, on various beaches, we have lots of both sea lions and seals that call it their home. If you take walk on the beach in the La Jolla Cove area, there's a good chance to find groups of seals and other groups of sea lions all in a single stroll. They present a good opportunity for photographs if you have a telephoto lens. (Again, keep a respectable distance.)
Science Advisor
Gold Member
- 2,836
- 12,608
collinsmark said:But generally speaking, if you don't mess with them, they won't mess with you, and everybody gets along just fine.
Once I was snorkeling in a kelp forest off of one of the Catalina islands off of California.
The water was deep and cloudy and the bottom could not bee seen.
All of a sudden a large (non-seal) pinniped shot up from the bottom to get some air. It was about 5 or 6 feet across as it hug out at the surface for about 1/2 a minute. Then it flipped over and disappeared into the depths.
It came up very fast. If it came up under me, I would have shot several feet out of the water.
Similar threads
Graduate Diffraction from a set of concentric rings with random phase
- Gezstarski
- · Replies 2 ·
- Optics
- Replies
- 2
Correct statement about random process of radioactive decay
- songoku
- · Replies 12 ·
- Introductory Physics Homework Help
- Replies
- 12
Sinusoidal sequences with random phases
- ashah99
- · Replies 1 ·
- Calculus and Beyond Homework Help
- Replies
- 1
Art Please rate my photos on a scale of 1-5
- BadgerBadger92
- · Replies 73 ·
- Art, History, and Linguistics
- Replies
- 73
Very cool factory production line photos
- berkeman
- · Replies 7 ·
- Mechanical Engineering
- Replies
- 7
Undergrad Do you have an example of a truly random phenomenon?
- The_Baron
- · Replies 122 ·
- Other Physics Topics
- Replies
- 122
Undergrad How does spontaneous emission start laser oscillation if photons have random phases?
- kelly0303
- · Replies 19 ·
- Atomic and Condensed Matter
- Replies
- 19
Looking for a reliable inkjet All-In-One printer for photos and docs
- yungman
- · Replies 27 ·
- Computing and Technology
- Replies
- 27
Undergrad Random variable vs Random Process
- fog37
- · Replies 2 ·
- Set Theory, Logic, Probability, Statistics
- Replies
- 2
Stargazing Question about my photos of a Full Moon -- What is this point of light?
- Graham 1956
- · Replies 5 ·
- Astronomy, Astrophysics, Cosmology
- Replies
- 5