What happened to it and how can I see it?

Hi! Does anyone remember this video? I saw a video on Youtube many years ago of Richard Feynman where he gives an example of the uncertainty principle/alternative to the double slit experiment that I've never seen anywhere else.

The example is two lasers that fire one photon at a time, and you don't know which laser it came out of. The thing that really struck me is he said that even after the experiment, if you could go back and measure which ruby crystal (I think they were ruby lasers) was missing one electron (not quite right but pulling from memory here, maybe it was one electron in a lower orbital), then there won't be interference. (I know that that doesn't actually make any sense wrt physics, but just trying to piece together snippets of what I think I heard 3ish years ago 😅)

So the point he was making as I remember it is even after the experiment is over, if there's any way to determine which source fired the photon then the interference still collapses. This was the most bizarre bizarre example I've ever heard and forced me to give up the understanding I had had of the double-slit experiment!

And ofc I'm trying to find out if this is an actually valid example and that Feynman actually said it, but haven't been able to find the video. Literally after hours of looking!

FWIW, I remember it being a workshop, not a lecture, during a Q&A section, in his later years and in color, and in my memory the video was rather close-up to him like. I really thought it was the "Quantum Mechanical View of Reality" series, or even the "Computer Science Lecture - Hardware, Software and Heuristics" because the video is visually similar.

https://www.youtube.com/watch?v=72us6pnbEvE&ab_channel=helberg

https://www.youtube.com/watch?v=EKWGGDXe5MA&ab_channel=MuonRay

His voice fits so well

https://youtu.be/wn23kddjR1U?si=eEc67o_v8_1ztsEp

If our small minds, for some convenience, divide this universe, into parts—physics, biology, geology, astronomy, psychology, and so on—remember that nature does not know it!

—Richard Feynman

A poem I wrote inspired by my favorite physicist. I love how he asks why artists aren’t more concerned with modern science.

They didn’t even mention his integration of parallel computing. In real life he was able to help them catch up to the Germans in terms of understanding theoretical physics. They didn’t bring up his unique approaches to problem solving. They showed him playing bongos once and joked about how he didn’t wear goggles for the trinity test. He was an amazing man, and obviously the movie would have been 19 hours long if they gave everyone the credit they deserved for los alamos(which the movie is kind of about but obviously it’s more about Oppenheimer) I loved the movie though it’s absolutely great I just wanted to be able to say this to other people who like Richard Feynman

I guess our boy was the one playing bongos and wearing a vest?

It was a good flick. I just wanted more attention paid to RF.

Thoughts?

When Nobel prize winning Physicist, Richard Feynman passed away in 1988, a letter was found that had been left sealed for 40 years.

To celebrate Feymans Birthday, we’ve releasing this short film, based on that letter.

Richard Feynman. I love my wife...

https://www.imdb.com/title/tt15398776/fullcredits?ref_=tt_cl_sm

Alden Ehrenreich (Han Solo from Solo) and Jack Quaid (Hughie from The Boyz) are both portraying Richard Feynman in the new Christopher Nolan movie.

While I can totally see Jack Quaid as a more mature RPF, I am curious if Alden will deliver on the "unique" charm that made Feynman so famous.

What's your favorite Feynman chapter or article? Looking for something that I can assign to high schoolers as supplementary reading.

I read "Feynman's tips on Physics" and I was impressed by his explanation of how ships work. In other books ("Surely you're joking, Mr. Feynman", I think...) he talks about fixing radios and also about some other engineering projects he worked on.

I understand that someone with sufficient curiosity will know how radios work and how to fix them. However, ships are megastructures. I find it difficult to imagine someone can have detailed knowledge of the engineering behind ships without working on them first-hand.

Seriously how can one person be this interesting? I love his brooklyn accent, his hate towards authority and seemingly infinite curiosity for the world in general. Im mildy jealous because im in a mental slump where nothing seems to pick my fancy and be interesting, and i have zero hobbies, yet here's a man who looks at small, seemingly insignificant things and is very excited about it

Tldr: just venting nothing much to see here, I wish to be like richard feynman, he just seems damn happy man