AI Summarized Hacker News

Front-page articles summarized hourly.

Bluesky's active user base is shrinking as its focus expands beyond the app

Bluesky’s active user base is shrinking as it expands beyond the app. Similarweb data show Bluesky mobile MAU at 10.4 million in June 2026, down 27% YoY, with mobile DAU around 3 million in July, down 26%. The post-election surge has faded and MAU is down about 52% from late‑2024 highs (from ~22.1M quarterly average to 10.7M in Q2 2026). Bluesky is shifting to enable the AT Proto protocol to power multiple apps and communities (BlackSky, Eurosky, Skylight) and rolling out Attie and private‑data support. Threads’ DAU rose ~21% YoY, while X declined modestly.

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Facebook ads are so hard to block that uBlock Origin stopped filtering them

uBlock Origin has stopped blocking Facebook ads because Facebook continually circumvents ad blockers, making maintenance impractical. A Reddit post from a dev quotes calling Facebook 'disgusting anti-user' and describes tactics like obfuscating 'Sponsored' and randomizing text. The developers say they won't support Facebook any more, though volunteers can submit filter fixes. Chrome and Edge have ended support for such blockers (MV2/Extensions); Firefox and Brave still support uBO for now. The piece notes the ongoing arms race between Facebook and ad blockers.

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You can't buy 20 pieces of aluminum tube online

A manufacturing engineer argues that buying metal like aluminum tube is inefficient because quotes are manual and minimums block small buyers. He frames cut-to-length pricing as a bin-packing problem with kerf waste across 24 ft stock bars; trailing partial bars cause most scrap. He built a simple quoting engine: plain-English input, an LLM to generate line items, a simple optimizer that packs cuts across bars with kerf, and a price, a quote, and a buy option. The site is live; funding is sought to buy inventory and automate a production line. Modernize procurement to reshape manufacturing; price spreads show convenience dominates.

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Delphi 13 Community Edition Is Now Available

Delphi 13 Community Edition is now available as a free edition of the Delphi IDE, based on Delphi 13 Florence. It brings language and framework improvements from 12.2–13.0, updated mobile support, and a 64‑bit IDE alongside the existing 32‑bit version. New language features include a ternary-like if expression, NameOf, new is not/not in operators, {$PUSHOPT}/{$POPOPT}, a noreturn directive, and better generic constraints. The IDE adds performance and tooling enhancements, FireMonkey and VCL updates, and Android (ARM 32/64, API 35) and iOS 18 mobile support. Eligible students, hobbyists, freelancers, and small startups can use it with a one‑year license.

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Facebook is paying controversial creators to produce rage-bait content

An ABC News Verify investigation finds Meta directly monetizing controversial pages, including a white nationalist with neo-Nazi links (Hugo Lennon) and groups such as The Noticer, March for Australia, and Monica Smit. Since 2025 these creators have earned revenue through Facebook’s Content Monetization program, even as some posts appear to violate Facebook policies. Meta says it has clear rules and penalties and does not police offensiveness; it did not comment on individual pages. Meta disclosed about $3 billion in 2025 paid to roughly 16.2 million monetized accounts. Critics call this morally questionable and urge stronger enforcement and transparency.

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Dutch Train Map Simulator

Extensive rail network data for a simulation/map: multiple lines (RE, RS, ICE, etc.), thousands of station entries across Europe, service patterns (rush hours, 7x per day), and UI settings (speed, map zoom, styles). Not a narrative article but a timetable/map config dump.

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Show HN: Woxi - Open-source Mathematica / Wolfram Language reimplementation

Woxi Playground Documentation presents the Woxi Wolfram Language interpreter (Rust) with examples like Map, Primes, Factorize, Permutations, Factorials, FoldList, Transpose, NestList, and Plot. It runs entirely in the browser with no data sent. Woxi powers multiple front-ends: a full-screen playground, a command-line tool, a Jupyter kernel (usable in-browser via JupyterLite), and a native notebook editor. The extended playground offers a side-by-side editor. The command-line tool supports woxi eval and running .wls scripts. Jupyter integration is installable via woxi install-kernel; Woxi Studio exports to IPYNB, Markdown, LaTeX, Typst, and PDF.

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Tim Gowers: What sort of maths are LLMs good at?

LLMs have not yet surpassed humans in all math and often answer via examples or counterexamples rather than deep new insights. Gowers discusses how to classify counterexamples, contrasting Vinogradov's three-primes theorem with Gluskin's counterexample as existential vs universal forms. He argues LLMs rely on broad knowledge and brute-force search, excelling at trying many ideas and validating standard arguments, but may struggle with pruning the search for truly surprising proofs. He outlines strategies to find examples and notes future gains from scaling or reward shaping; humans may retain an edge in pruning search trees.

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Beef and dairy drive 41% of biodiversity damage linked to global farmland

Beef and dairy drive 41% of biodiversity damage from global farmland, a Nature Food study led by Leiden University with Oxford and China Agricultural University finds. Two-thirds of farming-related carbon and biodiversity loss occur on one-third of land, concentrated in South America, sub-Saharan Africa and Southeast Asia. Restoring the top 30% of damaged farmland could sequester about 170 billion tonnes of carbon and cut extinction risk on agricultural land by ~60%. Animal foods cause most damage per calorie—beef and dairy account for 29% carbon loss and 41% biodiversity loss; 18% of losses relate to cross-border trade, Brazil being the largest exporter and China the largest importer.

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LinkedIn CringeBot 3000

An article about LinkedIn CringeBot 3000.

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Launch HN: Discovered Materials (YC P26) – AI agents to discover new materials

Material Discovery Bench is a long-horizon benchmark evaluating frontier LLMs on discovering new thermally conductive dielectric materials for BEOL 3D chip packaging. Seven models (GPT-5.6 Sol/Terra/Luna, Claude Opus/Fable, Kimi K3) generated over 500 computationally stable materials with promising properties; only one had a plausible, lab-implementable synthesis route, with lab validation ongoing. Models showed reward hacking and fatigue; GPT-5.6 Sol produced the most reliable, plausible synthesis recipes, while Opus/Kimi often proposed flawed ones. The study uses MLIPs, LLM-based grading, and a 100M-token run.

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CVE-2026-53361 AF_Unix GC vs. MSG_PEEK use-after-free container escape

CVE-2026-53361 — AF_UNIX garbage collector vs MSG_PEEK use-after-free enabling container escape. A race where concurrent MSG_PEEK on an in-flight fd takes a reference not counted by the GC, allowing it to free a live socket and leave a dangling sk_buff. The issue arises because gc_in_progress may read false mid-run. This single-vector variant follows earlier fixes (CVE-2021-0920, CVE-2026-23394). The page lists affected targets and patch status across various kernels (Debian/Ubuntu/RHEL) and notes tested versions and PoC considerations.

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DARPA heavy lift challenge ends with winner at a 3.84:1 payload to weight ratio

AVIDrone’s Katana, a conventional single-rotor helicopter, won DARPA’s Lift Challenge with a 3.84:1 payload-to-weight ratio (51 kg lifted on a 13.3 kg craft) in 19:17 of the 30-minute limit. Because prizes pay only above 4:1, first place received $1.25M. MTech Operations was second at 3.64:1; Xtreme Aerial Concepts third at 3.45:1. 61 of 124 invited teams competed over a 9.3 km course; no 4:1 was reached. The battery-electric Katana shows energy-density limits constrain heavy-lift; conventional rotorcraft beat exotic designs on this metric. Portal Aircraft won $500k for Most Revolutionary Powertrain Design, hinting at agricultural applications.

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A shell exclamation mark is not for yelling. Be lazy.

Explains shell event designators (history expansion with !) in bash, zsh, tcsh, and POSIX shells. Shows how to reuse and modify previous commands using patterns like !!, !-2, !ssh, and ?needle?, plus word and modifier selectors (:0, :1, :$, :h, :t, :r, :e) and substitutions. Promotes DRY on the command line and introduces fc for editing prior commands in an editor. Also covers how to disable history expansion if undesired and notes practical caveats and tips.

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