What is Interesting: Definition and 789 Discussions

Interest is a feeling or emotion that causes attention to focus on an object, event, or process. In contemporary psychology of interest, the term is used as a general concept that may encompass other more specific psychological terms, such as curiosity and to a much lesser degree surprise.The emotion of interest does have its own facial expression, of which the most prominent component is having dilated pupils.

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  1. H

    It's interesting to know such amazing stuff

    I was searching for a homework based on earthing. I read a conversation about it. It felt so amazing. So I thought I should sign up too.
  2. S

    What's New in Physics Since the Last 50 Years?

    Hi folks, 50 odd years ago I did a physics degree - wonder if anything interesting has happened since. Logged in a while ago, but seems lost. Worked in signal processing, still do the odd wee research contract. Nothing right now, thought I would have a look in here.
  3. bhobba

    B Interesting Use Of Pigeonhole Principle

    Check this one out about the number of hairs on a person's head, if not behind a paywall (I can't tell because I subscribe to Scientific American). Let me know if it is, and I will post a precis...
  4. S

    Interesting concept -- pump, motor or both?

    Not sure if it is meant to be a pump or a compressed air motor. Or maybe it can work as a pump or as a motor? What would be the practical problems? Does it add anything to the prior art? --- Edit : Not sure how it will make a proper seal, with that step in the back plate.
  5. Frabjous

    Interesting article on donkeys

  6. bob012345

    I Interesting Optical Phenomenon

    The lines have a slight purplish hue to them (at least reflected from leaves) and are about 2 feet apart. Here are images of the lines and the sun through the tree.
  7. benorin

    Calculus An interesting read: "Project Gutenberg EBook of Calculus Made Easy"

    This is a good book to read, free pdf version. Don’t judge the book by it’s cover. Read section 1, and 2, see if you learn something you weren’t expecting ~.^ This is the above link’s target: https://www.gutenberg.org/files/33283/33283-pdf.pdf Enjoy!
  8. PeterDonis

    A A pair of interesting papers: have counterarguments been published?

    I know there have been a number of previous threads discussing the work of Pavel Kroupa, and this work has generally been categorized as far out of mainstream because it deals with his views on alternative gravity theories and so forth. However, I have come across two of his papers that describe...
  9. T

    I Interesting Simulation Result

    Hey All, The simulation I am currently looking at is regarding the following paper: https://iopscience.iop.org/article/10.1088/1367-2630/10/4/045030. Let us define J = C_{3}/R^{3} (equation (2) in the paper) and let T be the simulation time until the trajectories of each particle changes by at...
  10. Nik_2213

    I Interesting angles between 10~~25º ?

    NOT a home-work / college question, merely wondering... Just as there are 'interesting' numbers, per primes, Pythag' triples, Euler-stuff etc, are there any 'interesting' angles between 10~~25º ?? I've had a hunt around, noticed several possibilities invoking eg transcendental fractions of...
  11. gleem

    History Science and Public Policy: an Interesting History

    Generally, we try to apply scientific knowledge in some manner to benefit humanity. Often the application requires some standards or precautions so that the applications will have maximum benefit and minimal risk. One such application was that of ionizing radiation. X-rays were discovered in...
  12. Kwantumnaut

    I A busy and interesting night sky in Mackinaw City

    Hello there, first let me say I hope this is the right section for this topic, and if not please feel free to move it! So a couple days ago I took a trip up to Mackinaw City, Michigan, and saw a few interesting and intriguing things (luckily!) in the sky that night, and was just hoping maybe...
  13. neilparker62

    Stargazing Planetary Lineup and Eclipse Viewing Tips for Cruise Ship Passengers

    Looking East this morning about 5:15 am. No telescope needed. But the pic is not actual - it is from Stellarium.
  14. Jehannum

    I Exploring the Relationship Between a/b and Geometric Series

    While working on a probability problem I accidentally found this relationship: $$\frac a b = \frac a {(b-1)} - \frac a {{(b-1)}^2} + \frac a {{(b-1)}^3} - \frac a {{(b-1)}^4} + ~...$$ I have done a bit of work on it myself, and have tried to research similar series. It seems to lead to some...
  15. Narayanan KR

    Interesting Links Between Faraday's EM Induction and EPR

    Imagine a magnet moving up and down so that its flux 'B' cuts the copper rod to produce an alternating emf, suppose if the movement is fast enough such that its frequency equals to the electron spin resonance frequency given by F = B x 2.8 Mhz per gauss, neglecting skin effect, more copper...
  16. S

    I An interesting question from Veritasium on YouTube

    Veritasium on YouTube https://www.youtube.com/c/veritasium/community has posted this problem, inviting viewers to say what would happen: Is the following answer correct?
  17. porton

    I I found an interesting math result, but now I see a contradiction

    I found an interesting math result ("halting problem is essentially solvable") yesterday, but now I see a contradiction (it follows "halting problem is solvable"). Participate in finding my error. Here is my short yesterday article (with links to other yesterday articles): [Unacceptable...
  18. E

    Interesting video on: Why are 2 logic gates faster than 1?

    Just saw an interesting video on youtube explaining Logical Effort very nicely. https://en.wikipedia.org/wiki/Logical_effort
  19. V

    Best layman non mathematical interesting book on Ray and wave optics

    A book on optics which is less mathematical maybe a similar one to physics for poets or gamow gravity classics
  20. bhobba

    I QM: Interesting View - Get the Inside Scoop

    I recently came across the following lecture on what QM is: I was shocked by how close it is to my view. What do others think? Thanks Bill
  21. A. Neumaier

    A An interesting paper about measurement and locality in QFT

    Bostelmann, H., Fewster, C. J., & Ruep, M. H. (2021). Impossible measurements require impossible apparatus. Physical Review D, 103(2), 025017.
  22. BvU

    I How big is a photon - Interesting video

    Bumped into this video after admiring the falling cat by @A.T. As an experimental physicist, indeed experienced a little of the 'hole in the brain' phenomenon!
  23. PeroK

    Simple Induction Interesting Algebra Problem

    I found this interesting video from Presh Talwalkar: Problem Statement. If: $$x + y + z = 1$$$$x^2 + y^2 + z^2 = 2$$$$x^3 + y^3 + z^3 = 3$$ Then, find the value of the higher powers such as $$x^5 + y^5 + z^5$$ The solution posted there uses the full Girard-Newton Identities. Here is an...
  24. G

    Could you point me to interesting videos about plasma balls?

    Could you point me to interesting videos about plasma ball?
  25. B

    Find an Interesting Topic in Graph Theory for an Exam

    Hello everybody, I hope it is the right section to post. For an exam, I should delve into a topic concerning graph theory. My work should include theoretical explanation, pseudo code, correctness analysis, complexity analysis and code implementation (C ++, python or other). Could someone...
  26. bhobba

    COVID Interesting Article On How Australia Is Making The Oxford Vaccine

    Hi All Here is how the Aussies are making the Oxford Vaccine: https://www.abc.net.au/news/science/2021-02-12/covid-19-vaccine-oxford-astrazeneca-adenovirus-csl-manufacturing/13140104 Thanks Bill
  27. Isaac0427

    I An interesting Nonlinear Differential Equation

    That's pretty much it. If there is a very basic strategy that I am forgetting from ODEs, please let me know, though I don't recall any strategies for nonlinear second order equations. I've tried looking up "motion of a free falling object" with various specifications to try to get the solution...
  28. Kirahlogin

    Why Do Penny Stacks Bond Together?

    What may have caused this bonding
  29. Narayanan KR

    An Interesting Question on Faraday's Law of Electromagnetic Induction

    On examining Maxwell's third equation which is about time varying magnetic fields (Faraday's electromagnetic induction) we find that time varying magnetic fields produce loops of electric fields in space irrespective of whether a coil is present or not, if any coil is present then these loops of...
  30. greg_rack

    Other Interesting high-school STEM internships/camps/projects

    Hi guys, As some of you may already know(😅), I'm 18 and currently attending my last year of high school in Italy, and looking forward to studying aerospace engineering abroad(UK or USA). My interest in STEMs is swiftly growing, leading me to study a lot on my own, taking part in as many cool...
  31. W

    I Interesting Scientific American article (The end of QM?)

    https://www.scientificamerican.com/article/new-views-of-quantum-jumps-challenge-core-tenets-of-physics/?fbclid=IwAR0z2pTmGqTBkm2JzvSNe6piKPZCGbhdpyZWcHeLO_2B-w5fPxFRKgfrGvY I love quantum physics almost mystical and paradoxical nature. That seems to be ending. Especially with the advent of...
  32. B

    B An interesting consequence of the closedness of the Cosmos

    What then can happen to the radio signal sent into space? It seems to me that after a while our signal will return to us as an echo, but the return period depends on the frequency of the signal. This corollary does not have a rigorous mathematical proof; an analogy is simply drawn with rational...
  33. D

    I What makes entanglement so interesting?

    Isn't entanglement just the conservation of spin, momentum, and position along with Heisenberg's uncertainty principle? I don't really see the big mystery or maybe I am just not understanding a key part of what makes entanglement so interesting. Can someone pinpoint how this receives so much...
  34. anemone

    MHB Prove Inequality: $\sqrt{ab}+\sqrt{cd}\le \sqrt{(a+d)(b+c)}$

    Prove that for positive reals $a,\,b,\,c,\,d$, $\sqrt{ab}+\sqrt{cd}\le \sqrt{(a+d)(b+c)}$.
  35. wrobel

    Heroic Boy Bridger Saves Sister From Dog Attack

    https://au.news.yahoo.com/disturbing-photo-heroic-boy-saved-sister-dog-attack-051333690.html When a six-year-old boy saw his little sister being attacked by a dog he didn’t hesitate to jump in and protect her. Bridger from from Cheyenne, Wyoming in the US has been dubbed a hero after he...
  36. BillTre

    Interesting Brain Scanning/Stimulating Backpack Allows Mobile Brain Studies

    This new technology will make monitoring outside of labs possible. It requires a brain implant. Kind of reminds me of the Borg.
  37. LCSphysicist

    Interesting exercise: Torque, radiation, momentum and equilibrium

    t is Torque I is the inertia moment P is the power c is the constant light speed r is the spot distance to the fiber p is the torsional constant theta is what we want In the equilibrium $$t = 0$$ $$ F\Delta T = \frac{E}{c} = \frac{P\Delta T}{c} => *F* = \frac{P}{c} (1) $$ This will be the...
  38. mliempi2018

    An interesting coupled oscillators problem (multiple springs and masses)

    I need to find the differential equations for each mass. ##y_1## is the equilibrium position, and ##y_2## is the second equilibrium position for each mass. I was thinking consider the next sistem: \begin{eqnarray} k\Delta y-mg&=&m\frac{d^2 y_2}{dt^2} \\ -2k\Delta y_1 -k\Delta y_2 -2mg...
  39. N

    Interesting observation concerning hydroxychloroquine

    I find the following facts interesting. Morocco and Algeria have been using hydroxychloroquine since the beginning, ignoring the WHO, who say that it is useless and dangerous. By contrast, Canada and France follow the WHO and forbid the use of hydroxychloroquine for covid. The numbers are...
  40. C

    I An interesting point regarding critical points and extrema

    Hi all, I have recently faced some problem about distances between two curves, and (re?)"discovered" an interesting point that I would like to share with you. In the following, we consider a function of two variables ##f(x,y)##, but it should be clear that the definitions and the result is...
  41. kolleamm

    What Science-Based Hobbies Can Spark Excitement and Productivity?

    I'm having trouble finding a hobby that really excites me. I've always been a big fan of science but I never really knew what I should do with it. So far I've just been programming but I haven't really found much use for it outside of building websites or apps which is a really boring task for...
  42. smodak

    Quantum Is No-Nonsense Quantum Field Theory a Student-Friendly Introduction?

    No-Nonsense Quantum Field Theory: A Student-Friendly Introduction by Schwichtenberg, Will let you know how it is when I read it. More details here
  43. bhobba

    B Interesting Book On The History Of QM And Einstein's Role

    Check it out: https://www.amazon.com/dp/B07PYMLZWJ/?tag=pfamazon01-20 Its available free if you have Kindle Unlimited. Many books do not get right that Einstein knew QM very well indeed and greatly admired Dirac, of whom he said: 'Dirac, to whom, in my opinion, we owe the most perfect...
  44. BillTre

    Interesting Path to Eukaryotic Cell Complexity Proposed

    The Inside-Out hypothesis, proposed in this paper (open access), explains the origin of several eukaryotic cellular structure based upon the cell geometry resulting from expansions cell protrusions becoming the cell's non-nuclear cytoplasm. Here is their summary diagram: and their caption...
  45. R

    Why don't they sell the interesting flavors in the US?

    This meditation is prompted by the cold I'm currently suffering. One of the products I like is a very intensely-flavored cough drop called "Fisherman's Friend". I found a mostly-full package in the house and commented to my wife that it was Mint flavor. "We must have picked that up in Germany"...
  46. Dr_Nate

    Posing interesting questions that make students want to think deeply

    I regularly start my classes with an opener that I hope might 'spark something' in the minds of my high school physics students. This is usually the Astronomy Picture of the Day or some interesting science news article. Sometimes it is more mathematical. On the math side, so far, I've thrown up...
  47. DifferentialGalois

    Interesting Physics Riddle I Devised

    A theoretical astrophysicist was absentmindedly working through papers on Mossbauer spectroscopy, eventually coming to the Pound Rebka experiment, a remarkable test of GR. (Gamma rays were sent from the top of a building to a receiver, so as to measure the gravitational blueshift in such an...
  48. Tazerfish

    Where to find interesting and challenging problems in Physics and Math?

    Summary: I would like to know your favorite (freely accessible) resources and exercises. Preferably not ordered by topic, university (bachelor) level and requiering some creative thinking/ no overly tedious calculations. I was not sure where to put this, feel free to place this thread in...
  49. M

    A What Is the Significance of the Matrix Identity Involving \( S^{-1}_{ij} \)?

    Hi all, I've come across an interesting matrix identity in my work. I'll define the NxN matrix as S_{ij} = 2^{-(2N - i - j + 1)} \frac{(2N - i - j)!}{(N-i)!(N-j)!}. I find numerically that \sum_{i,j=1}^N S^{-1}_{ij} = 2N, (the sum is over the elements of the matrix inverse). In fact, I...