AI Sells Ads, Fakes Reviews, Sparks Code Wars!

The 'S&P 493' reveals a different U.S. economy

Key Points

• S&P 500 gains in 2025 are led by the AI-driven Magnificent Seven.
• Excluding those seven, broader U.S. large caps show weaker performance and investment.
• Small-cap stocks have underperformed and face greater economic headwinds.

The Great Downzoning

Key Points

• Downzoning spread across Western countries, curbing previously permissive building practices.
• The article links these restrictions to modern housing shortages and significant economic costs.
• Property-owner interests, more than ideology, drove where and how density limits were imposed.

The risk of round numbers and sharp thresholds in clinical practice

Key Points

• Round-number thresholds can cause excess risk compared to statistically optimal thresholds.
• Real-world data (MIMIC-IV) show risk patterns that contradict monotonic model predictions.
• Glass-box ML and statistical tests identify discontinuous and paradoxical risk artifacts.

Garfield's Proof of the Pythagorean Theorem

Key Points

• Garfield’s 1876 proof uses a geometric construction to form a trapezoid and congruent triangles.
• Two area calculations of the trapezoid—formula vs. sum of triangles—are equated.
• Simplification of the area equality yields a² + b² = c², proving the Pythagorean theorem.

Show HN: Anthony Bourdain's Lost Li.st's

Key Points

• Partial archive of Bourdain’s li.st content recovered via Internet Archive.
• Highlights include 80’s Playlist, Crimes Against Food, Food I’m Thinking About, and Food on Film.
• Some list content and images are still missing; readers are invited to help locate them.

How stealth addresses work in Monero

Key Points

• Bob derives a shared secret k=H(rA) and computes a one-time address P=kG+S.
• Alice independently derives k via ECDH (aR=rA) and detects payments to P.
• Only Alice can spend funds since P=(k+s)G yields her private key (k+s).

Comments on "Glauert's optimum rotor disk revisited"

Key Points

• High tip-speed ratio analysis allegedly leads to zero torque and power.
• Momentum theory assumptions are claimed invalid at low tip-speed ratios.
• The Comment raises transparency and reproducibility concerns about the paper.

I Know We're in an AI Bubble Because Nobody Wants Me

Key Points

• Built DeepBeliefSDK to enable large-scale, low-cost inference across EC2 instances.
• Jetpac’s technology ran efficiently on phones; post-acquisition, Warden led mobile TensorFlow at Google.
• Author argues AI funding favors hardware over ML infrastructure engineering.

Leak confirms OpenAI is preparing ads on ChatGPT for public roll out

Key Points

• Android beta strings indicate ads coming to ChatGPT’s search.
• ChatGPT usage scale is very large, led by India.
• OpenAI roadmap: GPT-5.1 variants, no GPT-6 in 2025, ChatGPT Pulse to web.

DMT-induced shifts in criticality correlate with self-dissolution

Key Points

• DMT moves alpha/theta brain oscillations away from criticality, increasing entropy and reducing complexity.
• Criticality shifts correlate with self-dissolution intensity during the psychedelic experience.
• Functional excitatory–inhibitory ratio indicates a transition toward subcritical neural regimes under DMT.

Running a Business Means Contact with Reality

Key Points

• Explicit calls to action and professional copywriting increased conversions.
• Stating the service location (“in New York City”) improved lead relevance.
• Operational discipline (photos, client tracking) is vital for service-based businesses.

The undeserved status of the pigeon-hole principle (EWD 1094)

Key Points

• Generalized formulation: maximum ≥ average (and minimum ≤ average) for finite sets.
• Traditional and contrapositive forms are logically equivalent; metaphors can mislead.
• The generalized principle is stronger and more broadly applicable than the classic form.

Hachi: An Image Search Engine

Key Points

• Self-hosted image search engine focused on personal data.
• Iterative query refinement via multiple resource attributes.
• Planned expansion to video, text, and audio modalities.

Show HN: I built Magiclip – an all-in-one AI studio

Key Points

• Generates professional videos from text rapidly.
• Repurposes YouTube videos into TikTok-ready clips.
• Uses a simple three-step workflow for fast publishing.

Quebec to ban public prayer in sweeping new secularism law

Key Points

• Bill 9 bans prayer in public institutions and communal prayer in public spaces, with fines for violations.
• Restrictions on religious symbols and full face coverings would extend to more educational and childcare institutions.
• The bill invokes the notwithstanding clause to pre-empt Charter challenges, drawing criticism from advocacy and religious groups.

It's Always the Process, Stupid

Key Points

• AI increases speed but won’t fix broken workflows.
• Unstructured-data processes require structured workflow design before AI.
• Define trigger, transformation, and structured output for reliable AI integration.

Build Your Own Router with URLPattern()

Key Points

• URLPattern enables exact, optional-slash, and wildcard route matching.
• Sequential router configs map patterns to component tags and render the first match.
• A custom web component serves as the router outlet, with 404 handling left as a TODO.

DNS LOC Record

Key Points

• CloudFlare’s RRDNS lacked a parser to convert textual LOC data to internal binary format.
• RFC 1876 defines both textual and binary formats for LOC records, including defaults.
• LOC records are rare but supported in CloudFlare’s DNS editor and matter at scale.

Chainalysis Successful Deanonymization Attack on Monero

Key Points

• Leaked presentation allegedly shows Chainalysis running poisoned Monero nodes and collecting metadata.
• Remote-node use bypasses Dandelion++, increasing deanonymization risk.
• Recommended countermeasure: run a personal Monero node to leverage Dandelion++.

The CRDT Dictionary: A Field Guide to Conflict-Free Replicated Data Types

Key Points

• CRDTs preserve all concurrent updates and converge without coordination.
• Consensus and Last-Write-Wins have availability/data-loss trade-offs compared to CRDTs.
• CRDT merges rely on commutativity, associativity, and idempotence, grounded in lattice concepts.

Datacenters in space are a terrible, horrible, no good idea

Key Points

• ISS-scale solar arrays (~200 kW) power only ~200 GPUs at ~1 kW/GPU.
• Matching a 100,000-GPU datacenter would need ~500 ISS-sized satellites.
• RTGs (50–150 W) are far too weak to power modern GPUs.

Bronze Age mega-settlement in Kazakhstan has advanced urban planning, metallurgy

Key Points

• 140-hectare Bronze Age settlement shows planned urban layout.
• Evidence of large-scale tin-bronze metallurgy and industrial zoning.
• Location near Altai Mountains implies role in Eurasian exchange networks.

Copenhagenize Index 2025: The Global Ranking of Bicycle-Friendly Cities

Key Points

• Utrecht tops the 2025 Copenhagenize Index; Copenhagen and Ghent follow.
• Regional leaders: Montréal (NA), Niteroi (LatAm), Quelimane (Africa), Christchurch (Asia & Oceania).
• Full report and comparison tools are available, alongside case-study success stories.

Major AI conference flooded with peer reviews written by AI

Key Points

• Pangram Labs found about 21% of ICLR peer reviews fully AI-generated.
• ICLR organizers plan automated screening for AI policy compliance.
• Pangram’s tool also flagged 1% of manuscripts as fully AI-generated.

Iceland declares ocean-current instability a national security risk

Key Points

• Iceland labels potential AMOC collapse a national security risk.
• Scientists warn the AMOC is slowing, with a possible tipping point this century.
• Iceland launches cross-government planning to mitigate consequences.

Building road signs at home using a Cricut Machine

Key Points

• Use Cricut Maker 2 and desktop software to design and cut vinyl.
• Size constraints: 1 ft cutting width; 1 ft × 2 ft achievable with a 2 ft base sheet.
• Apply vinyl with transfer tape and a cold roll laminator for smooth results.

AccessOwl (YC S22) Is Hiring a Technical Account Manager (IAM)

Key Points

• Hiring for a Technical Account Manager (IAM) to lead post-sale technical partnerships and implementations.
• Requires experience with identity/SaaS ecosystems (Google Workspace, Okta, Microsoft Entra, SSO, SCIM) and compliance (SOC 2/ISO27001).
• Remote-first role in North America; AccessOwl is YC-backed, profitable, with noted customers.

Testing Shows Automotive Glassbreakers Can't Break Modern Automotive Glass

Key Points

• AAA found common glassbreakers ineffective on laminated glass.
• FMVSS 226 has pushed many brands to laminated side windows.
• Seatbelt cutters are primarily useful for trained responders.

Hardening the C++ Standard Library at scale

Key Points

• Harden LLVM’s libc++ to make the C++ Standard Library safer by default.
• Debug-only safety checks are inadequate; enable checks in production.
• Testing and fuzzing cannot guarantee safety under real-world conditions.

We're learning more about what Vitamin D does to our bodies

Key Points

• Vitamin D supports calcium absorption; infants are widely advised to receive supplements until age one.
• Deficiency is linked to hypertension; supplementation can lower blood pressure in deficient individuals.
• Evidence is mixed on whether vitamin D supplements reduce cardiovascular events, but deficiency is associated with higher risk.

Zero Knowlege Proof of Compositeness

Key Points

• Fermat’s test certifies compositeness by finding b with b^(n−1) ≠ 1 (mod n).
• Python’s pow function demonstrates a fast compositeness check on a large n.
• ZKPs enable verification of constraints (e.g., in cryptocurrencies) without revealing underlying data.

An Update on the Farphone's Battery

Key Points

• Community feedback prompted removal of the Fairphone 2’s battery to mitigate fire risk.
• The phone boots and the web server runs from USB power without the battery.
• The project is shared by Louis Merlin under a CC BY-NC-SA 4.0 license.

Show HN: Network Monitor – a GUI to spot anomalous connections on your Linux

Key Points

• Real-time monitoring of active network connections on Linux.
• Modern GUI built with Rust and GTK4.
• Live I/O statistics displayed alongside connection data.

OCaml maintainers reject massive AI-generated pull request

Key Points

• OCaml maintainers rejected a 13,000+ line AI-generated DWARF-support PR.
• Concerns included copyright, review capacity, design process, and overlap with OxCaml.
• Maintainer Gabriel Scherer closed the PR due to lack of reviewers and misaligned approach.

Student Perceptions of AI Coding Assistants in Learning

Key Points

• Two-part exam: AI-supported task followed by unaided extension
• 20-student sample with Likert-scale and open-ended responses
• AI aids initial understanding and confidence but may hinder independent transfer

Ported freetype, fontconfig, harfbuzz, and graphite to Fil-C

Key Points

• Core font libraries (FreeType, Fontconfig, HarfBuzz, Graphite) were ported to Fil-C.
• The Linux desktop shown is fully compiled with Fil-C for memory safety.
• The system is presented as performant enough for daily use, demonstrated with DejaVu Mono.

Framework Computer Now Sponsoring LVFS / Fwupd Development

Key Points

• Framework Computer is the first vendor to sign a new LVFS sponsorship agreement.
• LVFS/fwupd is broadly adopted, with 135M+ downloads and institutional support from Red Hat and the Linux Foundation.
• Framework’s “Startup Sponsor” tier (~$10k/year) and supplier influence underscore practical, ecosystem-level support.

Plinko PIR Tutorial

Key Points

• Private reads are not well served by ZK-SNARKs or traditional FHE.
• Classic two-server PIR enables private queries using random subsets and XOR operations.
• Two-server PIR has trust, communication, and computation drawbacks.

Electric vehicle sales are booming in South America – without Tesla

Key Points

• Chinese brands are expanding EV sales and dealerships in South America, especially Peru.
• Port of Chancay has halved trans-Pacific shipping times, aiding Chinese exports.
• EV market shares hit record highs across Chile, Brazil, and Uruguay in 2024.

Learning Feynman's Trick for Integrals

Key Points

• Feynman’s trick is based on the Leibniz integral rule for differentiating under the integral sign.
• The method is under-taught, and the article offers heuristics to guide its practical use.
• A core condition is continuity in the variables, allowing the derivative to pass under the integral sign.

Be Like Clippy

Key Points

• The movement promotes user-friendly, consent-first technology.
• It opposes data exploitation and opt-out data collection.
• A video calls developers, companies, and users to adopt open, transparent practices.

Show HN: Zero-power photonic language model–code

Key Points

• Passive optical inference with unitary layers and Born rule probabilities enables zero electrical power on-chip.
• Trained in <1.8 hours on an Apple M3 Pro using a restricted TinyStories-derived dataset with ChatGPT 4.1 augmentation.
• Provides a low-cost optical implementation path and releases code and trained weights.

All it takes is for one to work out

Key Points

• One acceptance can be sufficient in competitive processes.
• The author’s experience: initial rejection, persistence, and eventual admission.
• Applying the mindset broadly to jobs, housing, relationships, and admissions.

An update on the Farphone's battery

Key Points

• Community feedback prompted removing the Fairphone 2’s battery to reduce fire risk.
• The modular design enabled quick modification and direct power via micro‑USB.
• The server resumed operation about 40 seconds after reboot.

The Origins of Scala (2009)

Key Points

• Odersky and Sollich built a Modula-2 compiler via bootstrapping from a Pascal subset.
• Borland purchased the compiler as Turbo Modula-2 for CP/M; the IBM PC version was delayed and became TopSpeed Modula-2.
• Odersky chose research at ETH Zurich with Niklaus Wirth over joining Borland, a step toward Scala’s eventual creation.

Rare X-ray images of a 4.5-ton satellite that returned intact from space

Key Points

• Empa imaged EURECA with a high-energy X-ray facility, capturing the entire satellite non-destructively.
• Analysis found structural and instrument defects, guiding improvements for reusable spacecraft.
• Techniques are applicable beyond space, including aviation and automotive component inspections.

Show HN: Nano PDF – A CLI Tool to Edit PDFs with Gemini's Nano Banana

Key Points

• Edits and creates PDF slides via natural-language prompts using Gemini 3 Pro Image.
• Preserves searchable text with OCR re-hydration and supports parallel, multi-page processing.
• Requires a paid Google Gemini API key; includes options for context, style refs, resolution, and Google Search control.

Post-mortem of Shai-Hulud attack on November 24th, 2025

Key Points

• Malicious preinstall scripts in PostHog npm packages used Trufflehog to steal and exfiltrate credentials.
• Only npm-distributed JavaScript SDKs were affected; malicious versions were removed and tokens revoked by 9:30 AM UTC.
• Root cause traced to stolen GitHub bot PAT and CI secrets via a PR-modified workflow days before the attack.

Baboon: Data Modeling with Automatic Evolutions and tagless binary codecs

Key Points

• Automatic codec derivation for JSON and UEBA with evolution‑aware code generation.
• Current codegen targets are C# and Scala, including deduplicated C# output.
• Explicit process for handling foreign types via custom codec creation and registration.

Joe Armstrong interviews Alan Kay (2016) [video]

Key Points

• Interview: Joe Armstrong and Alan Kay video published by Erlang Solutions.
• Event: Code Mesh Conference dates (Nov 8–9, 2017; workshops Nov 7).
• Related content: Additional talks and a Stanford seminar on Erlang concurrency.

Europe's New War on Privacy

Key Points

• Coreper approved the revised “Chat Control 2.0” on Nov 26, 2025.
• The new draft removes mandatory scanning but promotes voluntary mass detection.
• Mandatory age verification would effectively end anonymous communication.

Men Who Made America's Self-Made Man

Key Points

• Jackson’s self-made image contrasted with documented early advantages.
• Two shifts—post-Revolution anti-elitism and 19th-century economic change—fueled the self-made ideal.
• The 1815 New Orleans victory vaulted Jackson to national prominence.

Landlock-Ing Linux

Key Points

• Landlock provides runtime, allowlist-based sandboxing for Linux applications.
• Restrictions are permanent for the current thread and descendants once applied, with up to 16 policy layers.
• It is unprivileged, stackable with SELinux/AppArmor, offers ABI versioning, and has bindings for Rust, Go, and Haskell.

Show HN: No Environment Setups Anymore

Key Points

• Use the “gitarsenal” command to start the tool after installation.
• The npm package “gitarsenal-cli” is deprecated; the project now focuses on V2.
• The article references Key Features and a 3-step onboarding but provides no detailed steps.

Blender facial animation tool. What else should it do?

Key Points

• Streams ARKit facial tracking from Live Link Face into Blender Shape Keys with real-time preview.
• Supports ARKit’s 52 Shape Key names and Perfect Sync; not compatible with Metahuman protocol.
• Simple setup with IP and port 11111; troubleshooting focuses on network and Shape Key naming.

Bazzite: The next generation of Linux gaming

Key Points

• Steam is pre-installed; HDR/VRR supported; improved CPU schedulers aim for responsive gameplay.
• Non‑Steam launchers integrate into Steam Gaming Mode (e.g., Lutris, EA App, Epic, GOG, itch.io, Rockstar, Ubisoft).
• Image-based updates enable rollbacks; security includes SELinux, Secure Boot, cosign-signed images, and LUKS with TPM.

Americans no longer see four-year college degrees as worth the cost

Key Points

• 63% say a four-year degree isn’t worth the cost; 33% say it is.
• Support for degree value has declined since 2013 and 2017 benchmarks.
• Rising tuition and economic change, including AI, frame the shift in attitudes.

Let go of StackOverflow; communities must take ownership

Key Points

• Argues for community-owned support channels over reliance on Stack Overflow.
• Uses a TLA+ example to illustrate friction from platform moderation.
• Highlights incentive misalignment between community learning goals and Q&A platform policies.

Dilution vs. Risk taking: Capital gains taxes and entrepreneurs

Key Points

• Accrual-based taxation dilutes successful founders but increases positive payoffs via refundable credits.
• Founder outcomes are highly skewed: 84% zero exit; top 2% take 80% of value.
• A 2% wealth tax mirrors dilution effects but offers no risk-sharing benefits.

Scala

Key Points

• Comprehensive tuning and scale tool with flexible ratio/cents input and storage.
• Robust features: GUI, 850+ commands, MIDI playback, scripting, and HTML help.
• Wide export support to MIDI and many hardware/software synths, plus Csound integration.

1964 Recompiling Engine Documentation (2001) [pdf]

Key Points

• Dynamic recompilation is presented as a speed-focused alternative to interpretation.
• Interpreter workflow and opcode parsing are demonstrated with code examples.
• Source file references show where interpreter and opcode logic resides in 1964.

The HTTP Query Method

Key Points

• QUERY is a safe, idempotent HTTP method that processes a request body and returns results.
• Introduces the Accept-Query header for capability advertisement and negotiation.
• Specifies interactions with headers, redirection, caching, conditional and range requests, and includes IANA registrations.

Meshtastic

Key Points

• Open-source, decentralized mesh networking designed for off-grid use
• Runs on affordable, low-power devices
• Offers multiple client platforms to connect and control devices

Stopping bad guys from using my open source project (feedback wanted)

Key Points

• The maintainer seeks to discourage use of his package by large corporations and harmful actors.
• He is considering changing the MIT License and pursuing collective action.
• He cites evidence of corporate free-riding and ethical concerns about technology’s downstream impacts.

A new Little Prince museum has opened its doors in Switzerland

Key Points

• Museum opened November 7 at Besenval Palace in Solothurn, Switzerland.
• Exhibits based on Jean-Marc Probst Foundation’s 10,000+ item collection.
• The Little Prince is translated into 600+ languages and dialects.

Generating Cats with learned lookup tables

Key Points

• Patch-wise LUT generation with a 16-layer transformer yields recognizable cat images.
• Orthogonality penalty and tanh weighting improve diversity and quality over training.
• Planned dynamic LUT via outer products and added static tokens aim to boost capacity.

Tell HN: Regrets. Think carefully about how you spend your time

Key Points

• Imminent surgery prompts reflection on time and meaning.
• Confession of a 2015 campaign to silence a programmer, including Reddit sockpuppets.
• Distinction between building companies and building communities, plus emphasis on ethical choices and daily habits.

Mint Is Not TeX

Key Points

• MINT uses @-prefixed, user-defined commands configured via YAML and provides only a parser.
• Language-agnostic design encourages custom processing through AST traversal in any language.
• A formal grammar and Euclid-based example demonstrate syntax and semantic document modeling.

The Druridge Bay Ruin [video]

Key Points

• The site is described as not a real ruin and not a ruined cottage.
• The description highlights an unexpected feature hidden within the structure.
• Video length is 12:42.

Matrix Core Programming on AMD CDNA Architecture

Key Points

• How to program Matrix Cores in HIP using compiler intrinsics and proper data layouts
• Mixed‑precision approach: low‑precision inputs with FP32 accumulation for speed and accuracy
• CDNA4 boosts low‑precision throughput (up to 2× vs CDNA3) and adds FP6/FP4 and exponent block scaling

Zigbook Is Plagiarizing the Zigtools Playground

Key Points

• Zigbook’s WASM binaries match Zigtools’ custom builds byte-for-byte, with provided checksums.
• Zigbook’s JavaScript includes identical sections from Zigtools’ code, per the article.
• Zigtools claims Zigbook did not comply with MIT license attribution and closed a corrective PR.

One of the Greatest Polar-Bear Hunters Confronts a Vanishing World

Key Points

• Remote Ittoqqortoormiit relies on two annual supply ship deliveries from Denmark.
• Axelsson joined Inuit hunters on a dogsled expedition across the sea ice.
• Each dogsled team required about one seal per day to feed the dogs.