en-US Physics Forums RSS Feed This is the official global feed for PhysicsForums.com Sun, 23 Aug 2026 01:08:21 +0000 Sun, 23 Aug 2026 01:08:21 +0000 Physics Forums - Science by Humans https://www.physicsforums.com/ Non-Linear Infinite Resistor Ladder Sat, 22 Aug 2026 22:54:06 +0000 https://www.physicsforums.com/threads/non-linear-infinite-resistor-ladder.1086040/ urn:xenforo:thread:1086040 invalid@example.com (bob012345) bob012345 The circuit looks like this;

IMG_6260.webp

I used LTSpice simulations, hand calculations and other tools to compute the equivalent resistance of this ladder and to see it converge toward a solution but found no exact closed form solution. I believe the exact solution is an irrational number but...

Read more]]> 36 Pilot wave persistence after measurement in Bohmian entanglement Sat, 22 Aug 2026 22:26:47 +0000 https://www.physicsforums.com/threads/pilot-wave-persistence-after-measurement-in-bohmian-entanglement.1086044/ urn:xenforo:thread:1086044 invalid@example.com (DrChinese) DrChinese Under the Bohmian Interpretation (BM or BMI):
Suppose we have a traditional pair of polarization entangled photons A and B going to Alice and Bob, who will test their polarizations in the same reference frame. To be specific, let's say A and B are entangled |HH> + |VV>. In the traditional...

Read more]]> 103 Question regarding information preservation in Hawing radiation models Sat, 22 Aug 2026 21:31:41 +0000 https://www.physicsforums.com/threads/question-regarding-information-preservation-in-hawing-radiation-models.1086065/ urn:xenforo:thread:1086065 invalid@example.com (maram56) maram56 Hello,
I am reviewing standard literature on the Black Hole Information Paradox and Hawking Radiation (specifically starting from Hawking's 1976 paper and Susskind's Black Hole Complementarity).
I have a foundational question regarding how observational limits are formally defined when...

Read more]]> 1 Cover songs versus the original track, which ones are better? Sat, 22 Aug 2026 20:49:10 +0000 https://www.physicsforums.com/threads/cover-songs-versus-the-original-track-which-ones-are-better.1050205/ urn:xenforo:thread:1050205 invalid@example.com (pinball1970) pinball1970 Which songs were performed, arranged or produced better in a cover than the original version?
Which songs should have been left well alone?

Also, I think restricting the covers just to released singles will restrict some interesting stonkers and stinkers so album tracks are allowed.]]> 2568 Are classical optics and quantum mechanics double slit experiments fundamentally the same? Sat, 22 Aug 2026 20:16:39 +0000 https://www.physicsforums.com/threads/are-classical-optics-and-quantum-mechanics-double-slit-experiments-fundamentally-the-same.1085960/ urn:xenforo:thread:1085960 invalid@example.com (aletheia) aletheia Has this question been explicitly discussed in the quantum-foundations literature?

Classical optics:
I(x) ∝ |E₁(x) + E₂(x)|²

Single-quantum case:
P(x) ∝ |ψ₁(x) + ψ₂(x)|²

What appears statistically in QM is the same interference structure from wave optics?

The most recent papers...

Read more]]> 60 Esoteric Words... Sat, 22 Aug 2026 19:57:18 +0000 https://www.physicsforums.com/threads/esoteric-words.1086067/ urn:xenforo:thread:1086067 invalid@example.com (sbrothy) sbrothy As you can guess im pretty bored!

What are some of the most esoteric words you've used in either speech or writing recently? I figure a good deal of you have some pretty hardcore ones what with your technical specializations and all....

As I'm from Denmark I have very few peers I can talk to...

Read more]]> 0 Identifying Winding Pairs Sat, 22 Aug 2026 18:48:51 +0000 https://www.physicsforums.com/threads/identifying-winding-pairs.1086045/ urn:xenforo:thread:1086045 invalid@example.com (Grubbs1960) Grubbs1960 I have a stator from a 1/2 hp, four speed, 3-phase motor. Coming from the stator windings there are 12 wires (two separate sets of six on opposite ends of the motor). Unfortunately these are identified in what appears to be a non-standard numbering system and I have no diagram. One set of wires...

Read more]]> 30 Compare Bending Resistance of Dimension Lumber used as Joist Sat, 22 Aug 2026 18:27:41 +0000 https://www.physicsforums.com/threads/compare-bending-resistance-of-dimension-lumber-used-as-joist.1086008/ urn:xenforo:thread:1086008 invalid@example.com (PAUL GRAHAM) PAUL GRAHAM Two 2 x 4s are laminated by means of glue and screws to form a horizontal beam 3.5" deep x 3" wide supported at the ends and uniformly loaded by static compression. Compare the bending resistance of this beam to that of a single 2 x 6 which is 5.25" deep x 1.5" wide under the same load.]]> 32 Hello from Germany – Interested in Cosmology and Torsion Models Sat, 22 Aug 2026 16:22:29 +0000 https://www.physicsforums.com/threads/hello-from-germany-interested-in-cosmology-and-torsion-models.1086039/ urn:xenforo:thread:1086039 invalid@example.com (Bill1090) Bill1090 Just wanted to quickly introduce myself. My name is Billy, I'm based in Germany, and I've been deeply fascinated by theoretical physics, general relativity, and cosmology for a long time.
I've recently been working on a framework looking at ECSK theory, torsion repulsion, and a Kerr-bounce model...

Read more]]> 2 Dazzle AI with a fashion statement, and it might see nothing Sat, 22 Aug 2026 15:24:33 +0000 https://www.physicsforums.com/threads/dazzle-ai-with-a-fashion-statement-and-it-might-see-nothing.1085980/ urn:xenforo:thread:1085980 invalid@example.com (.Scott) .Scott In a recent article from TechCrunch, Security Editor Zack Whittaker describes an interesting software project being tackled by coder Bill Swearingen. It's one that demonstrates a point I have repeated often: In general - when you use AI to create a solution, you often don't know exactly...

Read more]]> 5 How valid is the indivisible interpretation of quantum mechanics? Sat, 22 Aug 2026 14:43:33 +0000 https://www.physicsforums.com/threads/how-valid-is-the-indivisible-interpretation-of-quantum-mechanics.1085197/ urn:xenforo:thread:1085197 invalid@example.com (DarkloidNeos) DarkloidNeos I was reading up on the theory and apparently it's saying stuff that is in direct opposition with current views like how there is no wave function, but that quantum processes occur by randomness? I'm not sure how valid it might be but all I know is that it's a massive departure from the usual stuff.]]> 144 Tick-borne diseases - recent increases in cases Sat, 22 Aug 2026 14:41:41 +0000 https://www.physicsforums.com/threads/tick-borne-diseases-recent-increases-in-cases.1055310/ urn:xenforo:thread:1055310 invalid@example.com (Astronuc) Astronuc We have a related thread on Powassan virus
https://www.physicsforums.com/threads/powassan-virus-on-the-rise-in-the-us.1016929/

Washington Post (Yahoo) reports: A deadly tick-borne epidemic is raging. Dogs are key to ending it...

Read more]]> 17 Body Surfing in Morocco Sat, 22 Aug 2026 12:18:19 +0000 https://www.physicsforums.com/threads/body-surfing-in-morocco.1086029/ urn:xenforo:thread:1086029 invalid@example.com (Point Conception) Point Conception ]]> 1 Decay of sigma0 vs. decay of delta+ Sat, 22 Aug 2026 10:03:02 +0000 https://www.physicsforums.com/threads/decay-of-sigma0-vs-decay-of-delta.1086059/ urn:xenforo:thread:1086059 invalid@example.com (Rick16) Rick16 This is problem 2.7 from Griffiths' Introduction to Elementary Particles. Here are the two reactions that I am trying to examine:

(c) ##\Sigma^0\rightarrow\Lambda+\pi^0##

(g) ##\Delta^+\rightarrow p+\pi^0##

According to Griffiths' solutions, (g) is possible, (c) is not possible due to...

Read more]]> 0 Famous people known for two totally unrelated accomplishments Sat, 22 Aug 2026 09:10:56 +0000 https://www.physicsforums.com/threads/famous-people-known-for-two-totally-unrelated-accomplishments.1085786/ urn:xenforo:thread:1085786 invalid@example.com (sevensages) sevensages I always find it mighty interesting (and impressive) when people are famous for two or more totally unrelated things, especially when one didn't lead to another.

Here are some examples of people who are famous for two or more totally unrelated things:

Robert Leonard ---- He was an original...

Read more]]> 61 Extremely Weird Music Sat, 22 Aug 2026 09:00:14 +0000 https://www.physicsforums.com/threads/extremely-weird-music.1082868/ urn:xenforo:thread:1082868 invalid@example.com (Hornbein) Hornbein This Pete Cosey guitar solo is the weirdest thing I've ever heard. Saxophonist Dave Liebman said a good deal of cocaine was routinely consumed.]]> 29 Great ebass playing Sat, 22 Aug 2026 08:01:30 +0000 https://www.physicsforums.com/threads/great-ebass-playing.1083045/ urn:xenforo:thread:1083045 invalid@example.com (Hornbein) Hornbein Noted ebass player Mina has just joined East of Eden. She always was heard playing slap style before. Her finger style play is the greatest say I. How can anyone be so nimble?



Note the rust. There is a lot of rust in Japan. I think they like the way it looks. I know I do.]]> 95 First steps with Feynman diagrams Sat, 22 Aug 2026 07:57:18 +0000 https://www.physicsforums.com/threads/first-steps-with-feynman-diagrams.1086046/ urn:xenforo:thread:1086046 invalid@example.com (Rick16) Rick16 This is problem 2.3 in Griffiths' Introducion to Elementary Particles. I have Griffiths' solutions, otherwise I would be completely lost. Nonetheless, I tried to come up with a solution of my own first. I found only one possibility, which looked ok to me, but it is not even among the 17 ones...

Read more]]> 3 Wordle Lovers - Play the NYT Daily Game Sat, 22 Aug 2026 07:35:24 +0000 https://www.physicsforums.com/threads/wordle-lovers-play-the-nyt-daily-game.1016903/ urn:xenforo:thread:1016903 invalid@example.com (fresh_42) fresh_42 This thread is for all who like the daily Wordle game of the New York Times as much as I do.

The rules:

1) https://www.nytimes.com/games/wordle/index.html
2) Post your result.
3) Do not spoil the answer.]]> 8708 Space Stuff and Launch Info Sat, 22 Aug 2026 06:15:15 +0000 https://www.physicsforums.com/threads/space-stuff-and-launch-info.879196/ urn:xenforo:thread:879196 invalid@example.com (1oldman2) 1oldman2 Due to the constant never ending supply of "cool stuff" happening in Aerospace these days I'm creating this thread to consolidate posts every time something new comes along. Please feel free to add random information if its relevant. So to start things off here is the SpaceX Dragon launch coming...

Read more]]> 1700 Ultramassive Black Star Cosmology: Quantum Phase Transition Sat, 22 Aug 2026 06:05:43 +0000 https://www.physicsforums.com/threads/ultramassive-black-star-cosmology-quantum-phase-transition.1086055/ urn:xenforo:thread:1086055 invalid@example.com (Eduxer) Eduxer "Llegué a este tema a través de la investigación teórica propia en cosmología y física de altas energías. Tras desarrollar un modelo sobre la transición de fase cuántica y el rebote cósmico sin singularidad, estuve contrastando hipótesis y buscando espacios de divulgación rigurosos. Llegué a...

Read more]]> 3 What would happen if we changed the quantifiers in a continuity of a function? Sat, 22 Aug 2026 05:10:23 +0000 https://www.physicsforums.com/threads/what-would-happen-if-we-changed-the-quantifiers-in-a-continuity-of-a-function.1086053/ urn:xenforo:thread:1086053 invalid@example.com (loop quantum gravity) loop quantum gravity The definition of a continuous function at a point ##x_0## is:
$$\forall \epsilon >0 \exists \delta >0 \forall x(|x-x_0|<\delta \rightarrow |f(x)-f(x_0)|<\epsilon)$$

What would happen if we change it to another defintion as: ##\exists \epsilon >0 \forall \delta>0 \forall x(|x-x_0|<\delta...

Read more]]> 5 Nuclear reactor design with refuel period of more than 20 years Sat, 22 Aug 2026 03:00:56 +0000 https://www.physicsforums.com/threads/nuclear-reactor-design-with-refuel-period-of-more-than-20-years.1086031/ urn:xenforo:thread:1086031 invalid@example.com (corealist) corealist Nuclear fast reactors are capable of breeding more fuel than they consume. I was wondering if it would be possible to design a nuclear reactor that (initially) breeds just a little more fuel than they consume. The breeding ratio will reduce a little over time, but with a felxible design it...

Read more]]> 9 Collection of Lame Jokes Sat, 22 Aug 2026 02:50:19 +0000 https://www.physicsforums.com/threads/collection-of-lame-jokes.25301/ urn:xenforo:thread:25301 invalid@example.com (quddusaliquddus) quddusaliquddus Lamest joke you know ... :zzz:]]> 24249 Strategy to color crosstalk source Fri, 21 Aug 2026 19:04:48 +0000 https://www.physicsforums.com/threads/strategy-to-color-crosstalk-source.1086043/ urn:xenforo:thread:1086043 invalid@example.com (yefj) yefj Hello ,given a layout with multilayer traces.On certain trace there is a high distrotion due to cross talk.
Is there a strategy to see from where the cross talk is coming from?
To color different contributions of the spectrum noise and have indiction the source of it?
Is there such a thing?
Thanks.]]> 5 Clone ships with brain-taping to colonize other planets, part 2 Fri, 21 Aug 2026 18:38:54 +0000 https://www.physicsforums.com/threads/clone-ships-with-brain-taping-to-colonize-other-planets-part-2.1085959/ urn:xenforo:thread:1085959 invalid@example.com (Algr) Algr A prediction of mine from 2022 has come true:
It would not surprise me if the first successful information brain-transfer occurs before the first practical fusion reactor.



This was in the context of interstellar colonization. I think that braintaping trained humans...

Read more]]> 4 What is new with Koide sum rules? Fri, 21 Aug 2026 18:17:50 +0000 https://www.physicsforums.com/threads/what-is-new-with-koide-sum-rules.551549/ urn:xenforo:thread:551549 invalid@example.com (arivero) arivero I am detaching this to BSM because it is already getting too much parameters in the bag.

What has happened this year is that Werner Rodejohann and He Zhang, from the MPI in Heidelberg, proposed that the quark sector did not need to match triplets following weak isospin, and then empirically...

Read more]]> 346 Request for References Fri, 21 Aug 2026 15:14:44 +0000 https://www.physicsforums.com/threads/request-for-references.1086047/ urn:xenforo:thread:1086047 invalid@example.com (wrobel) wrobel Could anyone provide a reference to the text where the following theorem appears?

Sc.webp]]> 10 An intuitive reason for the definition of temperature via entropy and internal energy? Fri, 21 Aug 2026 13:08:38 +0000 https://www.physicsforums.com/threads/an-intuitive-reason-for-the-definition-of-temperature-via-entropy-and-internal-energy.1086042/ urn:xenforo:thread:1086042 invalid@example.com (Ax_xiom) Ax_xiom So, temperature is formally defined as the inverse of the rate of change of entropy in respect to internal energy. I'm fine working with this mathematically but I don't get it intuitively. Does anyone have some intuition as to why temperature is defined this way?]]> 6 Does molten magnesium react with silica? Fri, 21 Aug 2026 10:06:06 +0000 https://www.physicsforums.com/threads/does-molten-magnesium-react-with-silica.1085987/ urn:xenforo:thread:1085987 invalid@example.com (Nik_2213) Nik_2213 World-building: Assume *passive* atmosphere or processing in vacuum...

Does molten magnesium react with pure silica, SiO2, as powder or glass-fibre ??

Would it even 'wet' the glass ??
--
I'm world-building environment where iron is as exotic as our titanium was, perhaps only 'meteoric'...

Read more]]> 7 For WW2 buffs! Fri, 21 Aug 2026 08:08:17 +0000 https://www.physicsforums.com/threads/for-ww2-buffs.955592/ urn:xenforo:thread:955592 invalid@example.com (Drakkith) Drakkith Four years ago, the youtube channel The Great War started producing weekly videos detailing the events of World War 1, as they happened, week by week, one-hundred years ago. Since then they've released hundreds of videos, including many about the weapons, equipment, tactics, and...

Read more]]> 135 Prof. Verschure's thin section collection from the Fen and Hor localities Fri, 21 Aug 2026 01:47:14 +0000 https://www.physicsforums.com/threads/prof-verschures-thin-section-collection-from-the-fen-and-hor-localities.1054432/ urn:xenforo:thread:1054432 invalid@example.com (Andy Resnick) Andy Resnick (Edit: since the thread title was changed, this first sentence is too cryptic: the original title referred to a Tool song....)

Besides being a favorite song by a favorite band, the thread title is a straightforward play on words. This summer, as a present to myself for being promoted, I...

Read more]]> 172 LHC To Announce Its Lepton Universality Violation Results On Tuesday (20-Dec-2022) Thu, 20 Aug 2026 16:36:33 +0000 https://www.physicsforums.com/threads/lhc-to-announce-its-lepton-universality-violation-results-on-tuesday-20-dec-2022.1048275/ urn:xenforo:thread:1048275 invalid@example.com (ohwilleke) ohwilleke Experimental results tending to show lepton universality violations (i.e. a different probability for decays to tau leptons, muons, and electron-positron pairs respectively, mass-energy conservation permitting) are the most notable experimental anomalies from Standard Model predictions...

Read more]]> 49 Random Photos Thu, 20 Aug 2026 15:44:09 +0000 https://www.physicsforums.com/threads/random-photos.994801/ urn:xenforo:thread:994801 invalid@example.com (Point Conception) Point Conception A topic for random photos: Ko-Larn island 7 km West of PattayaIMG_20200717_114141.jpg]]> 3894 Collection of Science Jokes P2 Thu, 20 Aug 2026 13:03:54 +0000 https://www.physicsforums.com/threads/collection-of-science-jokes-p2.847743/ urn:xenforo:thread:847743 invalid@example.com (Greg Bernhardt) Greg Bernhardt Old thread: https://www.physicsforums.com/threads/science-jokes.4463/page-44

My wife just drew this

12376697_762331814307_4982172134413525429_n.jpg]]> 4100 I would like to get recommendations for graduate level physics books Thu, 20 Aug 2026 09:30:38 +0000 https://www.physicsforums.com/threads/i-would-like-to-get-recommendations-for-graduate-level-physics-books.1085588/ urn:xenforo:thread:1085588 invalid@example.com (Rick16) Rick16 I got a bachelor in physics 11 years ago, and I did not continue my studies. I have now decided to embark on a complete review of undergraduate physics, on my own, as a hobby. I have chosen 7 books for this purpose:

Mary Boas: mathematical methods in the physical sciences

John Taylor...

Read more]]> 11 Analysis of a rare die landing/balancing on a checker Thu, 20 Aug 2026 09:03:37 +0000 https://www.physicsforums.com/threads/analysis-of-a-rare-die-landing-balancing-on-a-checker.1085940/ urn:xenforo:thread:1085940 invalid@example.com (Gazzetta1992) Gazzetta1992 Hi everyone,

I came across a video clip from a Backgammon World Championship match showing a very unusual die roll that I would like to analyze from a classical mechanics perspective.

During the roll, after bouncing and losing kinetic energy, the die comes to a complete rest directly on top of...

Read more]]> 8 Prove that 1 + NOT (1 + NOT x) = x Thu, 20 Aug 2026 06:22:37 +0000 https://www.physicsforums.com/threads/prove-that-1-not-1-not-x-x.1086033/ urn:xenforo:thread:1086033 invalid@example.com (lemonfrostt) lemonfrostt In binary, the two's complement representation of a negative number is found by NOT b + 1, with the leading bit being a sign bit. In general, prove that applying the operation NOT b + 1 twice to some n-bit binary number yields the original number b.

I found this conceptually...

Read more]]> 7 Share Animal Pictures: For Animal Lovers Thu, 20 Aug 2026 01:38:30 +0000 https://www.physicsforums.com/threads/share-animal-pictures-for-animal-lovers.583729/ urn:xenforo:thread:583729 invalid@example.com (micromass) micromass Post your favorite animal pictures here!]]> 3060 M 7.7 Quake, Indonesia Wed, 19 Aug 2026 23:22:58 +0000 https://www.physicsforums.com/threads/m-7-7-quake-indonesia.1086007/ urn:xenforo:thread:1086007 invalid@example.com (davenn) davenn Another large quake on my seismo ( In Sydney, Australia) this morning ....

260814 2158UT M7.7 Indonesia zhi.gif


Saved image before the trace started overwriting itself ... that's 55 minutes of recording shown

M 7.7 - 68 km NNW of Ende, Indonesia​

  • 2026-08-14 21:58:21 (UTC)
  • 8.310°S 121.352°E
  • 10.0...

Read more]]> 5 Can protons leave the proton-exchange membrane of a working fuel cell? Wed, 19 Aug 2026 17:45:34 +0000 https://www.physicsforums.com/threads/can-protons-leave-the-proton-exchange-membrane-of-a-working-fuel-cell.1085880/ urn:xenforo:thread:1085880 invalid@example.com (mconnelldouglas) mconnelldouglas Can protons leave the proton-exchange membrane of a working fuel cell instead of reaching its cathode because of a strong external electric field?]]> 1 Series motors, switched to parallel Wed, 19 Aug 2026 17:04:33 +0000 https://www.physicsforums.com/threads/series-motors-switched-to-parallel.1083910/ urn:xenforo:thread:1083910 invalid@example.com (kopcicle) kopcicle [Mentor Note: Thread title has been updated to make it more descriptive]

Ref: https://www.physicsforums.com/threads/parallel-series-dpdt-with-mosfets-help.904631/post-5698363

Ser_Par_Switch.webp

It's been nearly 10 years but I'd still like to thank and acknowledge the thread starter and...

Read more]]> 18 The James Webb Space Telescope Wed, 19 Aug 2026 16:10:00 +0000 https://www.physicsforums.com/threads/the-james-webb-space-telescope.1010264/ urn:xenforo:thread:1010264 invalid@example.com (valenumr) valenumr Maybe this is more general discussion, but I am excited / nervous about the upcoming launch of the JWST.

https://jwst.nasa.gov/content/webbLaunch/countdown.html

I can't wait to see the observations this endeavor will bring!]]> 546 What Medium Does Light Travel Through in Space? Wed, 19 Aug 2026 11:01:07 +0000 https://www.physicsforums.com/threads/what-medium-does-light-travel-through-in-space.1059791/ urn:xenforo:thread:1059791 invalid@example.com (rekha1804) rekha1804 What is the difference between space and vacuum?
Since light waves require a medium to travel, then what is the medium in space?]]> 165 Obscure English Language Question... Wed, 19 Aug 2026 05:55:58 +0000 https://www.physicsforums.com/threads/obscure-english-language-question.1086022/ urn:xenforo:thread:1086022 invalid@example.com (sbrothy) sbrothy I just saw an episode of Family Guy where Peter says:

"There's a dog tied to an other dog."

I mean it was obvious that he (read: the voice actor) used extra energy articulating it thus as opposed to:

"There's a dog tied to another dog."

as I, being a non native speaker would probably have...

Read more]]> 10 Comparing the time of two moving clocks Wed, 19 Aug 2026 03:11:12 +0000 https://www.physicsforums.com/threads/comparing-the-time-of-two-moving-clocks.1085986/ urn:xenforo:thread:1085986 invalid@example.com (Mike_bb) Mike_bb Hello, PF!

I just understand that people couldn't fully understand me in my old topic because many terms in English have another senses in Russian and vice versa. Because of the language barrier I couldn't explain what I meant. Moreover, my vocab is poor and I speak English badly. Please, sorry...

Read more]]> 25 High-Energy Pb-Emulsion Collisions at CERN and x17 Tue, 18 Aug 2026 23:25:38 +0000 https://www.physicsforums.com/threads/high-energy-pb-emulsion-collisions-at-cern-and-x17.1085047/ urn:xenforo:thread:1085047 invalid@example.com (kodama) kodama this is a peer review journal

Journal of Physics G: Nuclear and Particle Physics

Search for new particles decaying into electron pairs of mass below 100 MeV/​

P L Jain and G Singh

Abstract​

We report results on 1220 electron pairs produced from a 207Pb beam at 160 A...

Read more]]> 3 Which textbook should I use for self studying calc-based physics? Tue, 18 Aug 2026 23:17:18 +0000 https://www.physicsforums.com/threads/which-textbook-should-i-use-for-self-studying-calc-based-physics.1085910/ urn:xenforo:thread:1085910 invalid@example.com (xerz) xerz TL;DR: I need help picking out a textbook out of the "big 3"

Hello! I have the option of using:
Raymond A. Serway, John W. Jewett - Physics for Scientists and Engineers with Modern Physics
Fundamentals of Physics, Volume 2, 12th Edition 2 -- David Halliday & Robert Resnick & Jearl...

Read more]]> 11 Falcon 9 predicted lunar impact Tue, 18 Aug 2026 23:15:13 +0000 https://www.physicsforums.com/threads/falcon-9-predicted-lunar-impact.1085922/ urn:xenforo:thread:1085922 invalid@example.com (DaveC426913) DaveC426913 https://www.cbc.ca/news/science/falcon9-rocket-moon-impact-9.7290981

1785792575627.webp

"You need to be taking an image every tenth, hundredth of a second, something like that, to try and catch this brief flash," he said. "If you're trying to catch the plumes, that's probably quite a bit...

Read more]]> 14 Torque to turn a large Beam on a Rotisserie Tue, 18 Aug 2026 20:10:42 +0000 https://www.physicsforums.com/threads/torque-to-turn-a-large-beam-on-a-rotisserie.1084996/ urn:xenforo:thread:1084996 invalid@example.com (Nick09) Nick09 Hi - I'm trying to design a Rotisserie for fabrication of large UC beams, and could do with some physics help if possible please.
The idea is... I'll create collars to allow a UC beam to turn on a set of rollers during fabrication process.

The largest item I have weighs in at 4225kg including...

Read more]]> 19 Asteroid invasion Tue, 18 Aug 2026 15:06:45 +0000 https://www.physicsforums.com/threads/asteroid-invasion.1085542/ urn:xenforo:thread:1085542 invalid@example.com (GTOM) GTOM I plan a hard SF story and a scene where a fleet intends to capture an asteroid mine. AI ruled out, that society completely get rid of anything more advanced than a calculator (and became a tyranny). They still have advanced technology developed before the AI rebellion. Destroy space colonies...

Read more]]> 2 Introduction - CraftyRyte Tue, 18 Aug 2026 14:22:04 +0000 https://www.physicsforums.com/threads/introduction-craftyryte.1086037/ urn:xenforo:thread:1086037 invalid@example.com (CraftyRyte) CraftyRyte Helloo ppl, i am craftyryte, i am 17 and an 11th grade physics student from india. I am here to fullfill my my curiosities and spark my interests and also occasional homework help. Anyway, hope to have fun here.]]> 1 My physics exam preparations feel like rote actions, I'm not understanding Tue, 18 Aug 2026 12:26:45 +0000 https://www.physicsforums.com/threads/my-physics-exam-preparations-feel-like-rote-actions-im-not-understanding.1079912/ urn:xenforo:thread:1079912 invalid@example.com (yo yo) yo yo i`m preparing for my exams and now, at 2am, i solve problems on dynamic topic. i try to analyse constructions, write some equations, but it doesn`t work at all. everything works out only when i just write down newton equations and projecting them and it feels like a meaningless exercise!

like...

Read more]]> 5 Our Beautiful Universe - Photos and Videos Tue, 18 Aug 2026 09:44:47 +0000 https://www.physicsforums.com/threads/our-beautiful-universe-photos-and-videos.800540/ urn:xenforo:thread:800540 invalid@example.com (DennisN) DennisN This thread is dedicated to the beauty and awesomeness of our Universe. If you feel like it, please share video clips and photos (or nice animations) of space and objects in space in this thread. Your posts, clips and photos may by all means include scientific information; that does not make it...

Read more]]> 2444 High school student with a passion for physics, looking to learn Tue, 18 Aug 2026 04:04:01 +0000 https://www.physicsforums.com/threads/high-school-student-with-a-passion-for-physics-looking-to-learn.1086032/ urn:xenforo:thread:1086032 invalid@example.com (HanLi) HanLi Hello everyone,

I'm a 16-year-old high school student from China. I've been fascinated by physics ever since I watched science documentaries about the universe when I was little.

My interest started with big questions: Where did the Big Bang come from? What is space itself made of? These...

Read more]]> 3 Advice on decision for a US vs UK/EU PhD [Particle Physics] Tue, 18 Aug 2026 02:57:43 +0000 https://www.physicsforums.com/threads/advice-on-decision-for-a-us-vs-uk-eu-phd-particle-physics.1079283/ urn:xenforo:thread:1079283 invalid@example.com (KH_137) KH_137 I recently applied to graduate programs in the US and some European positions for fall 2025. My interests are in model-building and phenomenology, especially in cosmological/astro-particle scenarios. I applied to around 14 US schools (since I could avail a waiver at half of these) and few...

Read more]]> 13 Favorite jazz musicians and songs Mon, 17 Aug 2026 14:47:12 +0000 https://www.physicsforums.com/threads/favorite-jazz-musicians-and-songs.1051251/ urn:xenforo:thread:1051251 invalid@example.com (BadgerBadger92) BadgerBadger92 I have always liked Jazz music (and blues, electric blues to be particular)

Who is your favorite musician and song?

I’ve always liked Herbie Hancock, especially his song “Maiden Voyage.”

]]> 390 Klein Paradox: Momentum in the Classically Forbidden Region Mon, 17 Aug 2026 14:38:11 +0000 https://www.physicsforums.com/threads/klein-paradox-momentum-in-the-classically-forbidden-region.1085891/ urn:xenforo:thread:1085891 invalid@example.com (flyusx) flyusx I'm currently reading over a little bit of relativistic quantum mechanics (with an emphasis on the need to transition to QFT) and have stumbled upon something I can't seem to figure out.

I was taught the Klein paradox as an example for why we need QFT. Pure relativistic quantum mechanics leads...

Read more]]> 4 Measurement and expectation value Mon, 17 Aug 2026 12:33:56 +0000 https://www.physicsforums.com/threads/measurement-and-expectation-value.1085951/ urn:xenforo:thread:1085951 invalid@example.com (hokhani) hokhani If measurement of an observable ##\hat{A}## is done over an ensembles of large number of copies of the system, then the average value of these measurements gives ##\langle A \rangle##. If we do this measurement over this ensemble again, we expect to get to the last result ##\langle A \rangle##...

Read more]]> 20 Is the deformation in Eq. 56 really innocuous? Mon, 17 Aug 2026 09:49:36 +0000 https://www.physicsforums.com/threads/is-the-deformation-in-eq-56-really-innocuous.1086020/ urn:xenforo:thread:1086020 invalid@example.com (Roberto Pavani) Roberto Pavani I'm reading these papers:

https://arxiv.org/pdf/2412.03840

https://link.springer.com/article/10.1140/epjc/s10052-026-15445-1

and I'm struggling with Eq. (56).

The Bell-CHSH enhancement appears only after replacing

## sign(φ(f)) ##

with

## sign(φ(f)+α) ##

whereas the...

Read more]]> 15 Physics Jokes! Mon, 17 Aug 2026 05:52:57 +0000 https://www.physicsforums.com/threads/physics-jokes.1085992/ urn:xenforo:thread:1085992 invalid@example.com (BadgerBadger92) BadgerBadger92 I would like to hear some physics jokes.

Here’s one on the uncertainty principle.

A cop pulls over a car for speeding. The cop tells the driver “Do you know how fast you were going?”
The driver replies “Yes, but I don’t know where the hell I am!!!”]]> 2 What if we could use a Black Hole as starship? Mon, 17 Aug 2026 03:50:24 +0000 https://www.physicsforums.com/threads/what-if-we-could-use-a-black-hole-as-starship.1085829/ urn:xenforo:thread:1085829 invalid@example.com (Fabien) Fabien What if the black hole's gravity were used while a spaceship was at the center of a black hole? If a mass reached the event horizon, time would appear to slow down for it, and reaching the center would take a long time, at least from the perspective of an outside observer, since the mass...

Read more]]> 18 If your office coworker left their phone ringing on their desk... Mon, 17 Aug 2026 02:14:58 +0000 https://www.physicsforums.com/threads/if-your-office-coworker-left-their-phone-ringing-on-their-desk.1086000/ urn:xenforo:thread:1086000 invalid@example.com (.Scott) .Scott ... how long would you let it ring?

I just read about the Oxford Electric Bell which has been ringing away since 1840.
It's has been left in a corridor in the Clarendon Laboratory at the University of Oxford.
It was set up by Reverend Robert Walker, who is not taking calls right now...

Read more]]> 6 Clues to Early Life Metabolism Mon, 17 Aug 2026 02:09:00 +0000 https://www.physicsforums.com/threads/clues-to-early-life-metabolism.1086025/ urn:xenforo:thread:1086025 invalid@example.com (BillTre) BillTre This paper just showed up:
Intermediate stages in the origin of metabolism at a phosphorylating hydrothermal vent
It is open access and can be found here.
in Science Advances, 5 Aug 2026, Vol 12, Issue
It is my origin of life paper of the year so far.

The article describes...

Read more]]> 0 Linking your phone to your Windows 11 computer defeats two factor authentication (TFA) Mon, 17 Aug 2026 00:40:56 +0000 https://www.physicsforums.com/threads/linking-your-phone-to-your-windows-11-computer-defeats-two-factor-authentication-tfa.1086024/ urn:xenforo:thread:1086024 invalid@example.com (berkeman) berkeman I recently bought a new Win11 laptop to replace my old Win10 laptop that was failing (but well backed-up). Adjusting to Win11 was no fun, but I mostly can get around in it now. One of the things that my new Win11 laptop asked me during the initial setup was if I wanted to link my phone with...

Read more]]> 1 Investigating the Possible Existence of a Fourth Spatial Dimension Sun, 16 Aug 2026 21:28:39 +0000 https://www.physicsforums.com/threads/investigating-the-possible-existence-of-a-fourth-spatial-dimension.1086023/ urn:xenforo:thread:1086023 invalid@example.com (Duongvo) Duongvo A spatial system has three dimensions, x, y, and z. If we project this three-dimensional spatial system onto a two-dimensional plane and then introduce a time axis perpendicular to that projection, which axis would be perpendicular to both the spatial projection and the time axis?


If such an...

Read more]]> 2 Backyard Trebuchet Breaks Sound Barrier Sun, 16 Aug 2026 18:02:15 +0000 https://www.physicsforums.com/threads/backyard-trebuchet-breaks-sound-barrier.1085998/ urn:xenforo:thread:1085998 invalid@example.com (Hornbein) Hornbein

Carbon fiber, 3D printed parts, multiple rotations. Numerous small refinements of the design to get to a 776 mph release. Your castle remains unmenaced, as the payload weighs a mere 4 grams. Pretty good though for a hobbyist. "I've been building trebuchets from the age of 12."]]> 2 Collection of Free Online Physics Books and Lecture Notes (Part 2) Sun, 16 Aug 2026 17:35:52 +0000 https://www.physicsforums.com/threads/collection-of-free-online-physics-books-and-lecture-notes-part-2.1048659/ urn:xenforo:thread:1048659 invalid@example.com (malawi_glenn) malawi_glenn This is part 2 of my thread Collection of Free Online Math Books and Lecture Notes
Here, we will consider physics and mathematical methods for physics resources.

Now, this is a work in progress. Please feel free comment regarding items you want to be included, or if a link is broken etc...

Read more]]> 36 MCNP5 LINAC Isocenter Dose Calculation Produces No Tally Results Sun, 16 Aug 2026 17:23:51 +0000 https://www.physicsforums.com/threads/mcnp5-linac-isocenter-dose-calculation-produces-no-tally-results.1085999/ urn:xenforo:thread:1085999 invalid@example.com (Anisur Rahman) Anisur Rahman I am working on a Monte Carlo simulation of a medical linear accelerator (LINAC) using MCNP5. My objective is to calculate the radiation dose at the isocenter of the LINAC treatment setup.

I have constructed the LINAC geometry, including the relevant components of the treatment head, and...

Read more]]> 2 Running older induction motors on VFDs Sun, 16 Aug 2026 17:19:20 +0000 https://www.physicsforums.com/threads/running-older-induction-motors-on-vfds.1085581/ urn:xenforo:thread:1085581 invalid@example.com (Guineafowl) Guineafowl The ‘spiky’ output of variable frequency drives (VFDs) can damage the insulation of older motors. They’re often used to run three phase motors on single-phase supplies in hobby workshops. (Modern motors have upgraded insulation and are designated ‘inverter-duty’.) I wonder what cheap and...

Read more]]> 68 Why does the movement of electrons create fields? Sun, 16 Aug 2026 12:11:59 +0000 https://www.physicsforums.com/threads/why-does-the-movement-of-electrons-create-fields.1085988/ urn:xenforo:thread:1085988 invalid@example.com (spagettot) spagettot i know the electron are not the one to transfer energy and that the electric and magnetic field are the ones doing the job but why is the field created in the first place and even the "energy flowing with the fields" is still pretty abstract to me]]> 29 I have a brand new theory of everything Sun, 16 Aug 2026 12:08:10 +0000 https://www.physicsforums.com/threads/i-have-a-brand-new-theory-of-everything.1086021/ urn:xenforo:thread:1086021 invalid@example.com (darkwood) darkwood I am a bedroom theoretical physicist with no real academic qualifications to my name, I have been obsessed with figuring out a way to solve all the problems we face in physics by correcting our flawed model of the universe, I now can proudly announce I finally believe I have achieved this by...

Read more]]> 3 Radiation in classical and quantum mechanics Sun, 16 Aug 2026 10:01:40 +0000 https://www.physicsforums.com/threads/radiation-in-classical-and-quantum-mechanics.1085945/ urn:xenforo:thread:1085945 invalid@example.com (hokhani) hokhani In classical electrodynamics, acceleration of charge generates radiation. In quantum mechanics, radiation is generated by transition of charge from higher quantum lever to lower. Is any relationship between the inter-level transition and acceleration?
Also, how about the radiation of a charge...

Read more]]> 11 Pocket Mechanical Calculator Sun, 16 Aug 2026 09:26:04 +0000 https://www.physicsforums.com/threads/pocket-mechanical-calculator.1086019/ urn:xenforo:thread:1086019 invalid@example.com (Hornbein) Hornbein Designed in the 1880's, popular in the 1920's through 60's. Subtraction by turning it over to get a different display on the other side. Division is tricky and takes skill. Made in Germany.

]]> 1 Correlating IQ and STEM performance Sun, 16 Aug 2026 00:43:08 +0000 https://www.physicsforums.com/threads/correlating-iq-and-stem-performance.1085716/ urn:xenforo:thread:1085716 invalid@example.com (gen x) gen x Is it true that high IQ and STEM are correlated?]]> 71 Some AI Music I Like Sun, 16 Aug 2026 00:19:03 +0000 https://www.physicsforums.com/threads/some-ai-music-i-like.1085653/ urn:xenforo:thread:1085653 invalid@example.com (Hornbein) Hornbein

Amazing what someone who doesn't know music can produce.

So how do I know he doesn't know music? On one of his covers the bass part is very wrong, most discordant, something only the rankest beginner might do and not likely even then.

Here's another good one...

Read more]]> 5 Renewable Energy Sources are Making Gains Sat, 15 Aug 2026 23:46:57 +0000 https://www.physicsforums.com/threads/renewable-energy-sources-are-making-gains.1085847/ urn:xenforo:thread:1085847 invalid@example.com (BillTre) BillTre Screenshot 2026-07-22 at 9.51.13 AM.webp

Screenshot 2026-07-22 at 9.56.42 AM.webp

Screenshot 2026-07-23 at 7.07.14 PM.webp

Screenshot 2026-07-24 at 8.07.36 AM.webp

Screenshot 2026-07-25 at 9.15.18 AM.webp]]> 17 Building intuition for waves (& quantum waves) Sat, 15 Aug 2026 21:42:12 +0000 https://www.physicsforums.com/threads/building-intuition-for-waves-quantum-waves.1085995/ urn:xenforo:thread:1085995 invalid@example.com (Aditya2725) Aditya2725 Hi. I've been studying topics like quantum theory, black body radiation, photoelectric effect, etc and I often get stuck with waves. We have all seen analogies for waves like the rope analogy and throwing a pebble in water but I want to know what exactly a wave is. Why and how does a disturbance...

Read more]]> 4 Sometimes Just Curious and Sometimes Need Quick Info Sat, 15 Aug 2026 15:36:41 +0000 https://www.physicsforums.com/threads/sometimes-just-curious-and-sometimes-need-quick-info.1086009/ urn:xenforo:thread:1086009 invalid@example.com (PAUL GRAHAM) PAUL GRAHAM I am scientifically curious, an autodidactic polymath. Occasionally I come upon a question that pertains to a physics topic which I can clearly express but do not have the information or training to solve. For example, the question that brought me tonight concerns a simple structural engineering...

Read more]]> 1 Talent Worthy of Wider Recognition Sat, 15 Aug 2026 10:52:43 +0000 https://www.physicsforums.com/threads/talent-worthy-of-wider-recognition.1064653/ urn:xenforo:thread:1064653 invalid@example.com (Hornbein) Hornbein The double lead guitar technique was invented by George Harrison on Your Bird Can Sing but the style didn't catch on. Jimmy Page put it on the map in Ramble On, then the Allman Brothers made it their signature. I like double lead guitar because that unique soaring sound is something no other...

Read more]]> 136 Stirring Coffee Effectively Sat, 15 Aug 2026 10:02:25 +0000 https://www.physicsforums.com/threads/stirring-coffee-effectively.1083704/ urn:xenforo:thread:1083704 invalid@example.com (Hornbein) Hornbein I noticed that the stirring of coffee was ineffective. There's always a layer of too-sugared liquid near the bottom. So...stir it vertically instead of swirling the coffee horizontally.]]> 41 Numerical implementation of creation and annhilation operators in the SSH model Sat, 15 Aug 2026 05:16:59 +0000 https://www.physicsforums.com/threads/numerical-implementation-of-creation-and-annhilation-operators-in-the-ssh-model.1080259/ urn:xenforo:thread:1080259 invalid@example.com (JangMilad) JangMilad Hi all,

I'm working on a numerical simulation involving the SSH model and the density matrix formalism. I'm using annihilation and creation operators at the first site, denoted by [itex]a_1[/itex] and [itex]a_1^\dagger[/itex], and I'm trying to understand how to construct and compute expressions like...

Read more]]> 1 Looking for an English translation of Levi-Civita's 1926 paper "Sur l'écart géodésique" ("On the geodesic deviation") Sat, 15 Aug 2026 02:31:45 +0000 https://www.physicsforums.com/threads/looking-for-an-english-translation-of-levi-civitas-1926-paper-sur-lecart-geodesique-on-the-geodesic-deviation.1084982/ urn:xenforo:thread:1084982 invalid@example.com (JimWhoKnew) JimWhoKnew I don't know what is the right sub-form for this question, so I post it here.

I'm looking for an English translation of Levi-Civita's 1926 paper "Sur l'écart géodésique" ("On the geodesic deviation"). Surprisingly, I couldn't find any translation on the web, although it is cited by many texts...

Read more]]> 13 On a paper by Udwadia and Kalaba Sat, 15 Aug 2026 01:55:25 +0000 https://www.physicsforums.com/threads/on-a-paper-by-udwadia-and-kalaba.1084007/ urn:xenforo:thread:1084007 invalid@example.com (wrobel) wrobel There is a highly ambitious article by Udwadia and Kalaba: article . To explain their main point, I will first recall the D'Alembert-Lagrange principle.
Assume we have have a mechanical system of particles with masses ##m_1,\ldots, m_\nu## and with position vectors ##\boldsymbol...

Read more]]> 2 YouTube Classics, Part Deux Fri, 14 Aug 2026 23:59:00 +0000 https://www.physicsforums.com/threads/youtube-classics-part-deux.826985/ urn:xenforo:thread:826985 invalid@example.com (lisab) lisab A continuation of YouTube Classics.

Playing trombone to 'wildlife':

]]> 829 Conclusions from Thomson’s cathode ray tube experiment Fri, 14 Aug 2026 15:30:55 +0000 https://www.physicsforums.com/threads/conclusions-from-thomsons-cathode-ray-tube-experiment.1085997/ urn:xenforo:thread:1085997 invalid@example.com (msumm21) msumm21 I have a question about JJ Thomson’s cathode ray experiment evidencing electric charge in an atom.

A DC power source was used to create voltage, evidently some kind of battery.

So, at the time of the experiment, they could make DC power sources, but did not know those caused charge to flow...

Read more]]> 2 Random Thoughts 7 Fri, 14 Aug 2026 10:27:10 +0000 https://www.physicsforums.com/threads/random-thoughts-7.1056780/ urn:xenforo:thread:1056780 invalid@example.com (Evo) Evo Time to start a new thread.

Here is the last page of part 6.

https://www.physicsforums.com/threads/random-thoughts-part-6.875108/page-317#post-6960672]]> 2049 Second degree for engineers for more job opportunities? Fri, 14 Aug 2026 03:40:23 +0000 https://www.physicsforums.com/threads/second-degree-for-engineers-for-more-job-opportunities.1084906/ urn:xenforo:thread:1084906 invalid@example.com (unlucky_) unlucky_ Hello, I'm a relatively new electrical engineering graduate based in Canada and I can't find any work. I receive lots of interviews but those never translate to offers. It appears that my experience and education are insignificant. Obviously this can't continue so I have two options. 1) Find a...

Read more]]> 32 How good is Brian Cox as a science communicator? Thu, 13 Aug 2026 21:04:45 +0000 https://www.physicsforums.com/threads/how-good-is-brian-cox-as-a-science-communicator.1084965/ urn:xenforo:thread:1084965 invalid@example.com (DarkloidNeos) DarkloidNeos I think this is the right place for this since the other threads don't seem like a good fit. So I found this video with him and Tyson:



(PS: the electron thing in the title is only at the 17:55 mark and it's more a one off comment, the title seems like clickbait too)

But I...

Read more]]> 43 Samsung smart TV intermittently ‘glitching’ Thu, 13 Aug 2026 20:36:17 +0000 https://www.physicsforums.com/threads/samsung-smart-tv-intermittently-glitching.1085907/ urn:xenforo:thread:1085907 invalid@example.com (Guineafowl) Guineafowl Model UE55NU8000T, with a ‘smart’ remote operating on Bluetooth (except for the power button, which is IR) and a normal one, which is all IR.

Intermittent faults:
- Loses BT pairing with the smart remote. Sometimes will not re-pair unless the TV is unplugged/plugged at the wall. Always works...

Read more]]> 9 Position vs momentum measurement Thu, 13 Aug 2026 19:07:20 +0000 https://www.physicsforums.com/threads/position-vs-momentum-measurement.1085924/ urn:xenforo:thread:1085924 invalid@example.com (hokhani) hokhani To measure the position of a quantum particle it seems that the detector must covers all the positions to detect the particle at one point. How about the measurement of momentum? Does this measurement require the momentum detector to cover all the possible values of momentum to show one of the...

Read more]]> 13 Particle vs Wave Interpretations of QM Thu, 13 Aug 2026 17:25:44 +0000 https://www.physicsforums.com/threads/particle-vs-wave-interpretations-of-qm.1085762/ urn:xenforo:thread:1085762 invalid@example.com (jeffn1) jeffn1 I am curious whether undergrad physics students take courses on the philosophy of science. For example, does your syllabus include reading the seminal book, The Structure of Scientific Revolutions by Thomas Kuhn. Physics is sort of the cutting edge for these type of issues. Of course, Newton...

Read more]]> 280 Extremely slow site responsiveness today on PF Thu, 13 Aug 2026 16:21:05 +0000 https://www.physicsforums.com/threads/extremely-slow-site-responsiveness-today-on-pf.1085983/ urn:xenforo:thread:1085983 invalid@example.com (symbolipoint) symbolipoint Physicsforums had been responding extremely slowly today. On more than one session on the forum. Right now the forum seems to be its typical snappy self.

(Windows 10 desktop, Firefox 153.0.3)

(Thanks for informing us, post #4)]]> 9 Mysteries of Uranus; Need for further exploration Thu, 13 Aug 2026 13:30:18 +0000 https://www.physicsforums.com/threads/mysteries-of-uranus-need-for-further-exploration.1085991/ urn:xenforo:thread:1085991 invalid@example.com (Astronuc) Astronuc I was watching a video on Uranus and some recent developments. There is consideration of a new mission to Uranus to get up close.

What NASA Found Inside Uranus​



Planetary Society - Uranus' biggest unsolved mysteries...

Read more]]> 3 Hi! Thu, 13 Aug 2026 12:02:22 +0000 https://www.physicsforums.com/threads/hi.1085996/ urn:xenforo:thread:1085996 invalid@example.com (Aditya2725) Aditya2725 Hi. I'm Aditya. A 17 year old high school student from India. I was searching for an open source platform to talk to experts and clear my conceptual gaps. I got to know about this platform recently from AI. I will definitely recommend this to my batchmates if I find the people here helpful. I am...

Read more]]> 1 Suspected of using AI for cheating, admissions testing Thu, 13 Aug 2026 10:42:56 +0000 https://www.physicsforums.com/threads/suspected-of-using-ai-for-cheating-admissions-testing.1085912/ urn:xenforo:thread:1085912 invalid@example.com (symbolipoint) symbolipoint I thought this article is interesting. Not gone through all of it yet since a bit too long but seems would be interesting for some people to go all the way through.

A top Mexican university used AI to prevent exam cheating. Now thousands of admissions are in doubt​

and for the yahoo link...

Read more]]> 1 Weird News Compilation Thu, 13 Aug 2026 10:15:50 +0000 https://www.physicsforums.com/threads/weird-news-compilation.878428/ urn:xenforo:thread:878428 invalid@example.com (Evo) Evo I'm always finding weird things in the news and thought it might be fun if we all shared odd stories we came across. Please feel free to post odd, funny or unusual stories in this thread.

Turns out that Zoobyshoe beat me in posting about this in another thread, so he will officially be known...

Read more]]> 2159 If we were able to prevent brain cell death as we age, would it be possible to achieve immortality or near immortality? Thu, 13 Aug 2026 01:56:27 +0000 https://www.physicsforums.com/threads/if-we-were-able-to-prevent-brain-cell-death-as-we-age-would-it-be-possible-to-achieve-immortality-or-near-immortality.1085993/ urn:xenforo:thread:1085993 invalid@example.com (Johndough_) Johndough_ I'm not exactly sure where to post this, but I've been wondering since brain cells don't really multiply. Still, they die as you age. If we were able to figure out a way to prevent them from dying off, would it result in a semi-immortal state where you're able to keep your consciousness as you...

Read more]]> 2 How does a cloud chamber respond to 2-slit interference? Thu, 13 Aug 2026 00:52:31 +0000 https://www.physicsforums.com/threads/how-does-a-cloud-chamber-respond-to-2-slit-interference.1085976/ urn:xenforo:thread:1085976 invalid@example.com (renormalize) renormalize The Motivation
Spurred by some interesting back and forth with @PeterDonis in a recent forum thread, I present here my attempt to answer the titular question. I begin with the Schrödinger equation for the wave function ##\psi## of a free charged particle of mass...

Read more]]> 16 Can ionic thrusters be used as a secondary propulsion system for rockets? Wed, 12 Aug 2026 23:28:26 +0000 https://www.physicsforums.com/threads/can-ionic-thrusters-be-used-as-a-secondary-propulsion-system-for-rockets.1085965/ urn:xenforo:thread:1085965 invalid@example.com (x1892) x1892 what if ionic thrusters being used as a secondary propulsion system for rockets once they reach space, after using jet engines for the initial atmospheric ascent?]]> 4