The Eternal Doorman

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When I was sleeping on the streets, in the rainy season, I used to enjoy watching the reflection of sodium vapour lamps in the rainwater as it fell on some ceramic paving. The angle of incidence of the street-light on the paving was such that the shadow it cast on the wall showed interference, and those patterns were affected as each drop of rain splashed down. I thought of making a garden sculpture that showed these patterns on a wall, reflected from a fountain or something. See  Simone Geirtz - Making a Lamp .  Subscribe to Zenodilodon .

Subscribe to GrowTree Organics . Subscribe to Symbiosis Texas . Subscribe to Crime Pays but Botany Doesn't . See this  comment : See also  https://www.americanforests.org/rgv/ . Subscribe to  Cornell Lab .  20:59 He's trying to find a scheme that scales without employing extra labor.  Subscribe to Dustups .  Jack-hammer farming in hydrophobic soil:  Subscribe to Curiosity Mine . All this makes me wonder about this structure in the Pisco Valley on the Nazca Plateau in Perú, called Monte Sierpe:  Subscribe to Stefan Milo . 

I actually understood very little of that. If you want you can't see more on Instagram:  Miguel Rivas: @migrivas Laura Cilevitz: @lauracilevitz Subscribe to Julie Nolke . 

Sounds like you could explain Bubble sort with this! See also  An elementary treatise on determinants : with their application to simultaneous linear equations and algebraical geometry  by Lewis Carroll. You're supposed to be reading Daniel's book Quantum Topology Without Topology to follow this series. Here's the introduction. He says a better name for it would be Low Dimensional Category Theory . Subscribe to Daniel Tubbenhauer . 

See The Power , by Naomi Alderman and  Elle Cordova Exhibiting Trump Duhrangement Syndrome . Subscribe to Elle Cordova . 

I had no idea about this person! See The Project Gutenberg eBook of Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1  "In the late evening of an active life I offer to the German public a work, whose undefined image has floated before my mind for almost half a century. I have frequently looked upon its completion as impracticable, but as often as I have been disposed to relinquish the undertaking, I have again — although perhaps imprudently — resumed the task. This work I now present to my contemporaries with a diffidence inspired by a just mistrust of my own powers, while I would willingly forget that writings long expected are usually received with less indulgence."  See  Alexander von Humboldt : Subscribe to Tibees .

How to make liquid air that can freeze almost anything: you have to heat it up.    Subscribe to Caltech . It ain't what you do, ... Subscribe to Jimmy Lunceford & His Orchestra . See  The Action Lab on A Curious Consequence of Reversibility  and  Emily Riehl and Terrence Tau on The Future of Mathematics .  

This is the simplest way to say things that makes them harder to understand: Subscribe to The Action Lab and Action Lab Shorts . 

When it's someone literate it looks quite healthy! Her t-shirt came from GTMO.  They're reading The Power by Naomi Alderman : Subscribe to Elle Cordova . 

See  Nadia Heninger and Annie Dai on the Ragged Edge of Telecommunications Security .  Subscribe to  Proton Privacy . 

See  Scientists Discover a Reason Why LED Lighting Is Awful .  Subscribe to Rootkid .  From  Hackaday Podcast Episode 355: Person Detectors, Walkie Talkies, Open Smartphones, And A WiFi Traffic Light . 

See this paper by Edward M. Barrett & Glen Jeffery:  LED lighting (350-650nm) undermines human visual performance unless supplemented by wider spectra (400-1500nm+) like daylight . See  See The Microwave Activity in Your Living Room .  Subscribe to Sunlight Matters . 

I didn't know you could do it worse and still carry passengers, but you can. Ryanair have catching-up to do! See her course on Capital .  Subscribe to Julia Buenaventura .

On invisible mathematics, see Paulson's Mechanizing Coinduction and Corecursion in Higher-order Logic (1998). Mike Gordon was also thinking about these things and it gives a nice example of Tau's idea of "post-rigorous" mathematics. See Corecursion and coinduction: what they are and how they relate to recursion and induction . The "illuminating blog post" he refers to on page 38 is here on the wayback machine . 24:07 See  Vladimir Voevodsky on the concept of mathematical structure in his letter exchange with Andrei Rodin . 35:03 On using different formal systems. See  About Logic Interview with Graham Priest . 39:51 On embedding Homotopy Type Theory in Lean, see  https://github.com/sinhp/HoTTLean . And in answer to that question, why not try to produce embeddings in, say, three different systems and then see how much you can say that is mutually consistent across all three? See  On the Origins of Bisimulation and Coinduction  by Davide Sangiorgi: In Comp...

The people who design social media systems should be interested in this:  https://www.stsi.pro/lab . See  DemistifySci Podcast Interview With Angus Fletcher,  also  Tom Stanton on Storing Power in a Pendulum  and John Campbell on the UK Biobank Dataset and the BBC . Subscribe to Cabrera Lab Podcast .    Subscribe to Music Selection .

The UK Biobank Dataset was a useful resource for a study which produced at least one useful result, which was accidentally reported by the BBC. That's why they decided they needed to make one owned by the pharmaceutical industry and put the Regius Professor of Medicine at Oxford University in charge of it:  UK NHS Sponsored Charity "Our Future Health" . Maybe there's some arbitrage in the valuation of risk that can be exploited here:  Indy Johar - Civilizational Optioneering .   See  John Campbell on a US/Canadian Study Which Found Something Interesting about Recommended Vitamin D Intake  and also these other videos on his channel concerning Vitamin D in various contexts . Subscribe to Dr John Campbell .  And for some more on journalism:  Private Eye Interview - Toxic lead in the UK: Laura Hughes, Financial Times - Paul Foot Award Nominee 2025 . That's such a great idea. Have awards for investigative journalism so people know that it's ...

See also  Tom Stanton on Magnetically Levitated Flywheels for Storing Energy  and  Tom Stanton - A Tiny 1kW Electric Bike Motor . That first video had an advertisement for Thangs:  https://thangs.com   This has had over 9 million views. That's quite a lot of advertising. The idea of using Machine Learning models to organise and distribute information is a good one, but you really want to be able to integrate them more easily than you can when the models are all separately monetized by different profit-centers. See  Work For Jane Street Capital  and  Indy Johar - Civilizational Optioneering .  Subscribe to Tom Stanton . See  Numberphile - Sophie Maclean on the Catalan Numbers : Subscribe to Music Selection .

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Comments are disabled. I guess they don't want to know what people think of their business. What they do is make money by exploiting ignorance. See this post of mine from September 2024 . I find it really sad that people think this is something worth doing. See  this talk by Indy Johar  especially the bit at  1:03:32  about people being bad capitalists. He seems to be recommending that Jane Street get into the insurance underwriting business. See also  Julia Buenaventura's Course on Capital .  Subscribe to Jane Street . 

26:44  The difference between logic and cause/science and religion. See  Philip Ball and Stuart Kauffman on Biology . Part II: With obvious links to  Bill Graham on Public Sound Systems  and  Indy Johar - Civilizational Optioneering  and on interfering with that process:  Jessica Utts on Why All Scientists Should Take Psi Seriously . Less obviously, maybe, links to constructive mathematics and intuitionistic logic:  About Logic Interview with Graham Priest . See their book Paradox Lost: the material principles of Natural Philosophy and support them on Patreon:  https://patreon.com/demystifysci . The day after this I saw  Derek and Laura Cabrera on Information and Communication . Subscribe to DemistifySci Podcast .

  My comment : 13:20 On remote healing and DMILS: there is some recent research on peptides that shows links to memory and provides a possible mechanism for this. It could be a kind of resonance set up with chemical environments which influence the folding of certain types of prion-like proteins which are known to be involved in long term memory. See the paper Peptides before and during the nucleotide world: an origins story emphasizing cooperation between proteins and nucleic acids where they show that the dynamics of protein-folding are far more complex than commonly understood. Also the connected group mind at 22:48 . Subscribe to Society for Scientific Exploration . Henry Stapp on Consciousness At  8:51 “Once you have gotten rid of Classical Mechanics and said that it’s no longer valid then you don’t have a good reason to say that consciousness cannot do anything. … what Bohr calls ‘The choice on the part of the experimenter as to what …’” Subscribe to Closer to Truth ...

The technology defined the business of public performance: venues, bookings, tours,... If the technology had been different then the business would have been different, because the technology was paid for by the business. See  Oliver Ettlin on Time Distribution in Large Networks  and  FCast at the FUTO Christmas Party .  Subscribe to  Docs Interviews on MV .  See  David Lynch's Weather Report March 04, 2022  and  Jumpin' Jehosaphat, It's AI an' Business News Agin' .

See  About Logic - Interview With Graham Priest .  My comment : 13:31 "Does this affect the foundations of reasoning?" The answer steers this (not entirely reasonably, in my opinion) into foundations of mathematics. But Priest clearly has some notion of a foundation for mathematics but doesn't want to say what that is. For example it seems to be more than just a syntactic notion. But need it be endowed with formal semantics? It's not obvious to me that it is hopeless to attempt to define such an "ur language" which captures a bare minimum of the requirement that mathematical discourse is inter-interpretable by subjects in a consistent manner. That would be a foundation of reasoning and would apply to more than just mathematics. Also this one :  15:56 cf . My earlier comment, I'd like to have heard more about this. Gödel's First Incompleteness Theorem holds for HA (first order Heyting (Intuitionistic) Arithmetic) but it is itself not provable intuit...

 See  All My Demons Greeting Me as a Friend (Book) . Subscribe to Aurora . 

10:11  e-mail is broken. Doh! There's a reason why everything is going to hell, and it's because nobody knows how to program. Why? Hint 13:49 . A student revolution that's not a rerun of Kent State:  21:56 . See  David Lynch's Weather Report March 04, 2022 . Subscribe to Level1 Links with Friends .  For some sanity, try this: See  https://berrycenter.org/ . Subscribe to The Berry Center .  And this:  Subscribe to FBPS . 

The first 2 minutes 42 seconds are great, and I read the description too, and it also sounds great. See  Melinda Lu - Functional Distributed Systems Beyond Request/Response . Starts at 12:20 . My comment : 50:34 How do you create an "outcome accelerator"? One way is to apply this idea of optionality to outcomes, so you need to be able to track an ever-increasing series of branching futures and in that process you will automatically make obvious the most probable outcomes as they emerge. (Also 57:02 ) I have no idea how you get investors interested in that idea.  59:37 The biosphere is only what we know about it. So what its options are are limited to our own knowledge, so that this is really a question about our epistemological optionality.   1:03:32 About people being bad capitalists. See also  Julia Buenaventura's Course on Capital . Subscribe to  The Long Now Foundation .

Subscribe to  brattyxbre .   Her shop:  https://www.abigailvetteseart.com/shop Subscribe to Good Gloom . Subscribe to Plastic Pen .

This is quite tricky because there is some slack between the specifications of the chips being emulated and the conditions actually present in the specific hardware like VIC20 , etc. See the code . Subscribe to Piers Rocks . 

If sovereignty is actually something people care about then it is not only European countries that have this "20% for US$300 Billion" problem.  Leila Murch works for  Maresquier Partners, Paris  "The gateway to exclusive late-stage tech investments." Subscribe to France24 . Russia, India and China all planning to develop sovereign telecommunications systems: It's a good thing so few countries have the capability to launch satellites. Subscribe to Anton Petrov . 

These are what people in Europe buy in tins , ...  Subscribe to  Las Curiosidades de Mamá . There's another palm in South America,  Geonoma deversa  (common name Jatata,) which also only grows a long long way away from population centers because it is highly sought-after as a roofing material. It is also very difficult to grow from seed.

Subscribe to Gangstagrass .  That's quite an old episode. What this doesn't address is billionaires who have put all the episodes of The Simpsons into a LLM and use it to make business decisions, ...  Widespread use of AI could be even worse than social media. See  On The State of the World . Subscribe to More Perfect Union .  Subscribe to FBPS . Gabor Maté  interviewed:   Subscribe to Bad Faith .

See  Sabine Hossenfelder on The Laws of Physics  and  https://assumptionsofphysics.org/book/ . 15:48  On covariant physics in flat space, see  Newton–Cartan theory  and Maggie Lieu on turning off gravity . 34:14 Wikipedia "A product integral is any product-based counterpart of the usual sum-based integral of calculus. The product integral was developed by the mathematician Vito Volterra in 1887 to solve systems of linear differential equations. ... For the case of f:[a,b]→ \mathbb{R}, the product integral reduces exactly to the case of Lebesgue integration, that is, to classical calculus. Thus, the interesting cases arise for functions f:[a,b]→A where A is either some commutative algebra, such as a finite-dimensional matrix field, or if A is a non-commutative algebra." See also  Expansion of the infinite product [Math Processing Error] etc. into a simple series  by Leonhard Euler and Jordan Bell, this Mathologer video about Euler's product for...

Subscribe to GEO Girl .   18:58 DNA is not stable in sulphuric acid, but Peptide Nucleic Acid is. See  Anton Petrov on Two Interesting New RNA Experiments . Also  Anton Petrov on Research in Prions and Theories of Abiogenesis and  Nick Lane on Cellular Metabolism and the Krebs Cycle . Subscribe to Kalamazoo Astronomical Society .   Subscribe to Boxoffice Movie Scenes .

This is quite a good one: My comment : 6:19 That idea, that the purpose of physics is to describe reality, gives you a metaphysical law: the universal physical laws are those things that happen just because there's no particular reason why anything else would happen. Then you have a mathematical basis because mathematics is just abstract physics: those things that are universal mathematical laws are just those things that are true for no particular reason at all.   She's not going to be producing so many videos now because of health issues and because her sponsors are holding back after the "holiday" insanity.  Subscribe to Sabine Hossenfelder .

These are really great! Subscribe to Oxford Mathematics .

This one, I mean, ... Here are some of the details:   10:42 Legality being one of them, probably the one that bothers people least of all, ... See  Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies . Subscribe to Anton Petrov . Maybe if you painted it yellow and gave it a funny voice, ...   Subscribe to Sesame Maniac .

I'm impressed! Another reason not to give them your photos! Since they have metadata like GPS coordinates and time, they don't need to compare many views to find matches. See  Arte Documentary on Datacenters in Chile  and Some Interesting Photographic Techniques .  See  Sharp Monocular View Synthesis in Less Than a Second  by Lars Mescheder, Wei Dong, Shiwei Li, Xuyang Bai, Marcel Santos, Peiyun Hu, Bruno Lecouat, Mingmin Zhen, Amaël Delaunoy, Tian Fang, Yanghai Tsin, Stephan Richter and Vladlen Koltun. Also  https://github.com/apple/ml-sharp . Subscribe to Adafruit Industries .  Subscribe to Computerphile .  See  Imagination - Illusion (cover by puppets) . 

It's the facts that you're checking that are the relevant ones. He said "I have heard that,... " which, in English, clearly marks this as anecdotal. DW translates this into Spanish as "me he enterado" which is stronger, the verb enterar used this way could mean "I found out", suggesting more than just anectodal evidence. As a native English speaker this is clearly about nothing: if you want to fact check what he said you need to know who told him that and when and you only need to ask them if that's what they said. Of course, if they say" no" then you're off down a rabbit-hole that you may never find your way out of. But that said, there is this case of Reiner Fuellmich:  John Campbell on the effectiveness of PCR Tests for Covid-19 . See also  Attempt to Silence John Campbell for Interviewing Andrew Bridgen MP  and  Letter From Bob Blackman, MP for Harrow East . Subscribe to DW Español . 

In the UK SAT tests are mandatory, national curriculum tests for primary school children in England, taken in Year 2 (Age 6-7, optional) and Year 6 (Age 10-11, mandatory) ... to assess math and English progress. See this comment : I guess these are US SAT tests . It looks like knowing your powers of two is useful, so people who've written low-level computer code have an advantage: 2^5 = 32 and 2^3=8. Subscribe to Ellie Sleightholm . 

I just ran into this by accident:  https://tree-sitter.github.io/tree-sitter/ . I learned about it from this old project  https://github.com/stonebuddha/vscode-better-sml . This thing is just a blob of webasm code and some configuration files. It's a joke: it's all up-side-down ! See  Language Server Protocol :  The Language Server Protocol (LSP) is an open, JSON-RPC-based protocol for use between source-code editors or integrated development environments (IDEs) and servers that provide "language intelligence tools": programming language-specific features like code completion, syntax highlighting and marking of warnings and errors, as well as refactoring routines. The goal of the protocol is to allow programming language support to be implemented and distributed independently of any given editor or IDE. In the early 2020s, LSP quickly became a "norm" for language intelligence tools providers. It's concrete all the way down. Why? Is it something to do wit...

See  Teddy Lambek - Toutouyoutou (Ukulele & Kazoo) .  Subscribe to Teddy Lambec . 

See the Invisible Internet Project at  https://geti2p.net/en/ ? See  https://omnixtar.github.io/I3P/ . Subscribe to SVFIG . 

They're a new kingdom all of their own, maybe. See  Prototaxites fossils are structurally and chemically distinct from extinct and extant Fungi  and  No eran hongos: descubren que los raros Prototaxites podrían ser un tipo de vida desconocido .  Subscribe to Scientific American . 

See  Seth Berry - Bedroom Filmmaker .  Subscribe to Fill in Blank Space . 

My comment : How much effort are human beings putting in to transmitting signs of our own putative intelligence which would be potentially detectable from somewhere else in the galaxy? My comment   Aliens synchronising their pulsars in different galaxies could direct their attention in certain directions where they expect it to be understood, but if you're not in that line you just see random flashes. Now look up the phenomenon of Branched Flow . See  Chris Lehto - Cosmic Octaves .  Subscribe to Anton Petrov . 

Here's the full-length scheduled programme:  Subscribe to Growtree Organics . Subscribe to Dustups .  FMNR Subscribe to World Vision Kenya .  WorldVision have offices in La Paz, I used to live a few blocks away from them:  https://www.worldvision.bo/ . See  Ron Garan Trying to Turn the World Right-side Up  and  Anton Petrov on Communicating With Aliens .  Joey on stupid property developers in Texas: Subscribe to  Crime pays but botany doesn't . 

See the books  The Orbital Perspective: Lessons in Seeing the Big Picture from a Journey of 71 Million Miles  and  Floating in Darkness: A Journey of Evolution by Ronald J. Garan Jr. Maybe if all the people who make big decisions can spend a few days on the moon,... See  Growtree Organics have Moss and Shaun Overton is Growing Stumps .  Subscribe to  Ron Garan . 

See  Seth Berry - Bedroom Filmmaker .  Subscribe to  The Literary Nomad .

See  Toby on Why 4D People Scare Us  and  Nick Lane on Cellular Metabolism and the Krebs Cycle   and  Senan - The Terrifying Result of Measuring Time Perfectly .  Subscribe to Our Fractal Universe . 

See  https://www.sethberry.art/ Fuck AI, do it yourself:  Subscribe to Seth Berry . 

My comment : My favourite bit was the cloud of caesium atoms and the analogy of tuning a radio.  7:37 . The thing is that cloud of caesium atoms has a spatial extent: it's at least a few cms in diameter, but then we find that 33cm difference in altitude produces a measurable variation in the number of ticks. The physicist Ivette Fuentes was talking about this once. It seems there is an awkwardness here, because general relativity and quantum mechanics are being "brought into contact", but it takes a relatively long time to measure the difference in the rate of oscillation over just 33cm of altitude. Another thing that is related to this is that in practice, to know that frequency standards are indeed correct, one needs to be able to compare several independent clocks, so again the spatial resolution of clocks seems to be traded off against temporal resolution. That whole thing about needing more energy to measure time more accurately was new to me. That was a very thought...

Buy our junk bonds or well go fuckin' nuclear! 

My comment: This is also why the idea that we may live in a non-euclidean 3-manifold scares me because if it were actually a 4D manifold then there would be no way for us to know anything about it at all! Or have I made a mistake? Maybe Edward Frenkel can explain:  Edward Frenkel on Jungian Archetypes in Mathematics .  She's pretty much admitted that she steals a lot of her ideas from the safes of 2D people,...  See  Toby Hendy has Published Her Book: A Guide to Making Friends in the Fourth Dimension . She is not even above stealing their children!  Subscribe to Tibees .  Here's Edward Frankel on  Tarski's undefinability theorem  and a 3-manifold: My comment: It's taken a long time for me to get around to listening to this. That story, around 12:15 , about computers not being able to represent truth is an old one. Maybe it's as old as Plato, who said that truth is not a matter of opinion, but one of fact. But that is not how we actually use comput...

He asks where does the Krebs Cycle come from? Biochemistry of course! (By that I meant a biochemist (called Krebs) but he doesn't call something biochemical unless he can associate it with a gene in some way!) 32:20 The idea that metabolism was happening before there was a genetic code. See Philip Ball and Stuart Kauffman on Biology  and also  Anton Petrov on Research in Prions and Theories of Abiogenesis .  49:23  On anaesthesia and metabolism. See  Action Lab on Chiral Molecules and Polarisation .  Subscribe to The Science & Cocktails Foundation . 

I enjoyed this thread in the comments .  For more on origins of life see  Nick Lane on Cellular Metabolism and the Krebs Cycle  and  Anton Petrov on Research in Prions and Theories of Abiogenesis .  The paper it refers to is this one:  A free-floating-planet microlensing event caused by a Saturn-mass object  by Subo Dong, Zexuan Wu, Yoon-Hyun Ryu, Andrzej Udalski, Przemek Mroz, Krzysztof A. Rybicki, Simon T. Hodgkin, Lukasz Wyrzykowski, Laurent Eyer, Thomas Bensby, Ping Chen, Sharon X. Wang, Andrew Gould, Hongjing Yang, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Dong-Jin Kim, Chung-Uk Lee, Byeong-Gon Park, Radoslaw Poleski, Jan Skowron, Michal K. Szymanski, Igor Soszynski, Pawel Pietrukowicz, Szymon Kozlowski, Dorota M. Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Milena Ratajczak, Patryk Iwanek, Marcin Wrona, Mateusz J. Mroz, Guy Rixon, Diana L. Harrison ...