LibreLingo – FOSS Alternative to Duolingo

https://librelingo.app/images/mascot-jetpack-noshadow.svg
LibreLingo is an experiment to create a community driven language-learning platform. Learn a language for free.

Firefox tab groups are here

https://blog.mozilla.org/wp-content/blogs.dir/278/files/2025/04/EN2-1024x578.png
Firefox built tab groups after 4,500 people requested it on Mozilla Connect. Community feedback and collaboration helped shape the feature, which balances flexibility with simplicity.

Try Switching to Kagi

The author switched from Google to Kagi search engine after experiencing semi-scams and poor results. Kagi provides better results and is ad-free.

Only Teslas exempt from new auto tariffs thanks to 85% domestic content rule

https://fuelarc.com/wp-content/uploads/2025/01/FuelArc-News-Logo-V2-Light.png
US Commerce Secretary Howard Lutnick announced vehicles with 85% domestic content will be exempt from new tariffs. Currently, only Tesla's Model 3 and Model Y qualify for the exemption.

Jepsen: Amazon RDS for PostgreSQL 17.4

Amazon RDS for PostgreSQL exhibits G-nonadjacent cycles violating Snapshot Isolation. This suggests it may provide Parallel Snapshot Isolation, a weaker consistency model, rather than Snapshot Isolation.

Chain of Recursive Thoughts: Make AI think harder by making it argue with itself

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CoRT makes AI models recursively think about their responses, generate alternatives, and pick the best one. It's like giving the AI the ability to doubt itself and try again... and again... and again. YES. I tested it with Mistral 3.1 24B and it went from "meh" to "holy crap", especially for such a small model, at programming tasks.

Amazon to display tariff costs for consumers

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Amazon will soon display how much of an item’s cost is derived from tariffs — right next to the product’s total listed price.

O3 beats a master-level GeoGuessr player, even with fake EXIF data

https://cdn.jsdelivr.net/gh/sampatt/media@main/posts/2025-04-26-geoguessr/image/2025-04-27-22-51.png
The OpenAI o3 model outperformed a Master I-ranked human in a head-to-head Geoguessr match, correctly identifying all five countries and twice landing within a few hundred meters. The model's performance comes from visual reasoning and on-the-fly web sleuthing, not hidden metadata.

Show HN: Beatsync – perfect audio sync across multiple devices

https://opengraph.githubassets.com/7820e02f6a5eb8e2c4dce7321af836fde65a2f03a9996a07f6a7ceae0ede64e1/freeman-jiang/beatsync
Beatsync is a high-precision web audio player for multi-device playback with spatial audio features. It's in early development, with mobile support experimental and available via bun install and dev commands.

Indian court orders blocking of Proton Mail

https://techcrunch.com/wp-content/uploads/2025/04/proton-mail.jpg?w=1024
Karnataka High Court ordered Indian government to block Proton Mail due to obscene emails. Proton Mail faces second block attempt in India after Tamil Nadu police sought to block it last year.

Waymo and Toyota outline partnership to advance autonomous driving deployment

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Toyota and Waymo reached a preliminary agreement to collaborate on accelerating autonomous driving technologies, aiming to improve road safety and deliver increased mobility. The partnership will combine Toyota's vehicle expertise with Waymo's autonomous technology to develop a new vehicle platform.

Knowledge-based society, my ass

The narrator, a PhD student, faces numerous challenges and absurdities in his academic journey, including a lack of resources, a demanding supervisor, and a bureaucratic university system. He eventually completes his thesis and defends it, but feels unfulfilled and disconnected from the scientific community, and decides to leave the university behind.

Generative AI is not replacing jobs or hurting wages at all, say economists

https://regmedia.co.uk/2022/06/17/shutterstock_ai.jpg
Economists found minimal labor and wage impact from generative AI chatbots on 11 occupations in Denmark. Despite fast adoption, AI chatbots have not led to significant economic benefits, with workers saving only 2.8% of work hours.

A single line of code cost $8000

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Screen.studio app's auto-updater repeatedly downloaded a 250MB update file every 5 minutes for thousands of users, generating 2 petabytes of traffic on Google Cloud. The issue caused users' internet providers to cancel contracts and resulted in significant costs, prompting the team to refactor the auto-updater and add new signals for forced updates.

Performance optimization is hard because it's fundamentally a brute-force task

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Code optimization is hard due to its brute-force nature and the complexity of interactions between CPU components. Optimizing code requires trial and error, profiling, and understanding of CPU architecture.

Show HN: A Chrome extension that will auto-reject non-essential cookies

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The user created a Chrome extension called "Reject Cookies" to auto-reject non-essential cookies and close cookie pop-ups, aiming to simplify online browsing. The extension is still a work in progress and needs user support to cover more use cases and report bugs.

Programming languages should have a tree traversal primitive

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The user proposes a new control flow construct called "for_tree" to handle tree-like traversal in a more convenient way, similar to how for/foreach loops handle linear traversal. This construct would allow for easy traversal of trees without the need for recursive functions or iterators, and would offer additional benefits such as the ability to use break, continue, and return statements.

Heart disease deaths worldwide linked to chemical widely used in plastics

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Researchers found that exposure to DEHP, a chemical in plastics, contributed to 368,764 deaths worldwide in 2018 due to heart disease. The deaths were most prevalent in Africa, South Asia, and the Middle East, with India having the highest death count.

Congress passes Take It Down act despite major flaws

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It would give the powerful a dangerous new route to manipulate platforms into removing lawful speech that they simply don't like, with President Trump himself saying that he would use the law to censor his critics. The bill passed the Senate in February, and it now heads to the president's desk.

My sourdough starter has twins

https://brainbaking.com/post/2025/04/my-sourdough-starter-has-twins/sourdough-report-1.jpg
The Citizen Science Sourdough Project compared my sourdough starter, Stinkie, to others from Europe, finding three exact matches in Switzerland, Greece, and Finland. Stinkie's unique characteristics are influenced by local climate, flour, and feeding habits.

Everything we announced at our first LlamaCon

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Bamba: An open-source LLM that crosses a transformer with an SSM

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IBM and Red Hat are hosting a meetup on May 7 in NYC to discuss optimizing LLM inference for performance and efficiency. Researchers are exploring alternative architectures to transformers, such as state-space models, to overcome the quadratic bottleneck and improve inference speeds.

How to build Intrinsic Motivation: a review of the science

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Erring towards answers is a blog bringing together insights from philosophy, psychology, and neuroscience. rhesus monkeys learn discrimination problems solely for the opportunity to visually explore the environment - not for monetary rewards! if rewards are experienced as controlling, they have 'a negative impact on intrinsic motivation' this may seem like pedantic point, but it has some ...

Duolingo will replace contract workers with AI

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Duolingo is shifting to an "AI-first" approach, using AI to automate tasks and free up employees for creative work. The company will "rethink much of how we work" and prioritize AI use in hiring, performance reviews, and content creation.

Oracle engineers caused five days software outage at U.S. hospitals

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Oracle engineers caused a 5-day software outage at several Community Health Systems hospitals, forcing them to use paper records. The outage, which began on April 23, was resolved on Monday and did not involve a cyberattack.

Show HN: Flowcode – Turing-complete visual programming platform

Flowcode offers a low-code platform with code-level flexibility for building AI workflows. It combines visual simplicity with full control and exportability to any stack.

Dear "Security Researchers"

This is a public open source software mirror server with no sensitive information. It hosts tested development snapshots like trixie and untested candidate packages like sid.

I can't pay rent because devs just don't care

https://bear-images.sfo2.cdn.digitaloceanspaces.com/herman-1683556668-0.png
User frustrated with outdated phone and HSBC app issues, unable to log in and make rent payment. Frustrated with inefficient and bloated websites that waste user resources.

What Is "Induced Atmospheric Vibration"?

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The Iberian Peninsula blackout was caused by a combination of factors including corona discharge due to dry air, changes in line impedance, and grid instability due to increased inverter sources.

ArkFlow: High-performance Rust stream processing engine

https://opengraph.githubassets.com/c0f1f4df91e3728d993a8f1adbf98fb8c463469f5b2b00f90d141de2d7a5d7d6/arkflow-rs/arkflow
Arkflow is a high-performance Rust stream processing engine with SQL queries, JSON processing, and Protobuf encoding/decoding capabilities. It supports multiple input/output sources and processors, including Kafka and generate streams.

Amazon denies tariff pricing plan after White House calls it "hostile/political"

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White House Press Secretary Karoline Leavitt called Amazon's plan to display tariff costs as a "hostile and political act". Amazon's plan exposes rift between businesses and President Trump over tariffs and trade war.

Pyrefly - A faster Python type checker written in Rust

A faster Python type checker written in Rust Get VSCode Extension

An illustrated guide to automatic sparse differentiation

https://iclr-blogposts.github.io/2025/assets/img/2025-04-28-sparse-autodiff/big_conv_jacobian.png
The cost of one vjp of $f$ is approximately the same as that for one evaluation of a vector. however, the memory footprint is larger, as intermediate results must be kept in memory. in reverse mode, no intermediate jacobian matrices are computed at any point. detecting the sparsity pattern of the hessian is more complicated than for the jax matrix. the exact performance depends on the number ...

After 53 years, a failed Soviet Venus spacecraft is crashing back to Earth

https://gizmodo.com/app/uploads/2025/04/Artist_s_view_of_ATV-5_reentry.jpg
A 53-year-old Soviet Venus probe is expected to make an uncontrolled reentry in late April or early May, with parts possibly surviving the descent and crashing on Earth. The risks are low but not zero, with a greater likelihood of the debris falling into a remote ocean area.

AirBorne: Wormable zero-click remote code execution (RCE) in AirPlay protocol

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Oligo Security Research discovered 23 vulnerabilities in Apple's AirPlay Protocol and SDK, allowing attackers to take control of devices and spread malware. Apple has released software updates to address the vulnerabilities.

Spain is about to face the challenge of a "black start"

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A massive blackout in the Iberian Peninsula has grid operators working to restore power through a "black start" process, which is challenging due to the need for power to operate the grid's management hardware and power plants. The process involves carefully managing the synchronization of power plants to meet demand without overwhelming the limited number of small plants operating.

Path Isn't Real on Linux

The Linux kernel doesn't handle PATH, dash in Debian interprets and executes commands, and evalcommand in dash performs the lookup. The lookup is done by dash, not the Linux kernel.

New atomic fountain clock joins group that keeps the world on time

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NIST-F4, a new atomic clock, is one of the world's most accurate timekeepers, ticking at a steady rate that would be off by less than a second if it started 100 million years ago. It helps keep official U.S. time and global time more stable and secure.

Manuscript of Ismail al-Jazarī's Ingenious Mechanical Devices (ca. 17th century)

https://the-public-domain-review.imgix.net/collections/arabic-machine-manuscript/arabic-machines-00020.jpg?fit=max&w=1200&h=850&auto=format,compress
Ismail al-Jazarī's 13th-century treatise details ingenious mechanical devices including clocks, automata, and a showering system for a king. His inventions, such as a life-like butler and a safe with combination dials, earned him the title "father of robotics".

Meta AI App built with Llama 4

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Meta AI is a new app built with Llama 4, offering personal AI experiences through voice conversations. It integrates with other Meta AI features, allowing users to interact with AI assistants across various Meta products and devices.

One-sixth of the planet's cropland has toxic levels of one or more metals

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A massive study found that up to 17% of farmland worldwide contains excessive levels of metals. This contamination affects around 900 million to 1.4 billion people globally.

DECtalk Archive

DECtalk is a speech synthesizer technology developed by Dennis Klatt in the 1960s and 1970s, later licensed to Digital Equipment Corporation (DEC) in 1983. DECtalk was released as a hardware module in 1984 and later as software products.

Show HN: Memex is a Claude Code alternative built on Rust+Tauri for vibe coding

https://sample.memexdata.com/launch-videos/introducing-memex-video-poster-face-final.webp
Memex is a tool that allows users to build projects quickly using natural language, with features like private project storage and customizable AI rules. It enables rapid prototyping and deployment, allowing users to achieve results in hours or days that would normally take weeks or months.
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AI hype is driven by companies trying to ride the enthusiasm wave, investors pouring money into AI-focused companies, fear of missing out in the IT industry, and fuzziness around what constitutes AI. The hype will eventually subside as companies struggle to deliver on promises and investors lose confidence.

Japan unveils first solar super-panel

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Japan is utilizing perovskite solar cells to lead the world in renewable energy, aiming to generate 20 gigawatts of electricity by 2040. This technology will improve Japan's economic security and reduce dependence on foreign energy sources.

Canadians give Liberals 4th mandate as Carney leads party to minority win

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Mark Carney led the Liberals to a narrow victory on Monday in an election dominated by issues like affordability, tariffs and annexation threats from U.S. President Donald Trump.

Mission Impossible: Managing AI Agents in the Real World

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The mission comes down to careful planning and restraining the context of what your agents can do. don't try to wrestle the llm into working around your bad design, says scott wilkinson of something from nothing. use the tool only for the areas where it’s proven successful, and keep trying new areas to see what's viable today. if you’re using a tool that doesn’t allow you to specify the intent of

Researchers are studying how to minimize human impact on public lands

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Researchers study crowd control in wilderness areas to balance conservation and visitor experience. They use evidence-based approaches to analyze policy impacts and develop strategies to minimize environmental consequences.

Ask HN: Is there hope for Microsoft 365 support?

Company 25friday.com is experiencing email deliverability issues with Microsoft 365, where emails containing their domain are blocked. Despite troubleshooting and Microsoft support, the cause remains unknown and the issue persists for a month.

The Homebrew Channel repository is archived (Apr 28, 2025)

https://opengraph.githubassets.com/6853019a796f29fab78809df9a329bf85f3e288744872cb5e40eb30f95a416b6/fail0verflow/hbc
The Wii homebrew software depends on libogc, which contains stolen code from Nintendo and RTEMS. The libogc developers have been accused of deliberate copyright infringement and plagiarism.

Greek Particles (1990)

Ancient Greek orthography closely represented speech, unlike modern English, which includes hesitations and meaningless expletives. Classicists have misinterpreted Greek particles for centuries, with most being meaningless.

Gaussian Splatting Meets ROS2

https://raw.githubusercontent.com/shadygm/ROSplat/main/assets/images/image.png
ROSplat is an online ROS2-based visualizer that efficiently renders complex 3D scenes using Gaussian splatting and GPU-accelerated techniques. It supports data loading from PLY files and integrates with ROS2 tools, requiring an NVIDIA graphics card for optimal performance.

The latest executive order creates a police state

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The US President has ordered the empowerment of state and local law enforcement to aggressively police communities and protect citizens. The order aims to provide resources, training, and legal protections for law enforcement officers and hold state and local officials accountable for obstructing law enforcement.

The last masters of Afro-Colombian machete fencing

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Grima, a traditional Afro-Colombian martial art, is a vital part of the country's cultural heritage, but its future is uncertain due to a lack of official recognition. Masters like Maestro Miguellourido and Porfirio continue to teach and preserve grima, hoping to pass it on to younger generations.

Elon Musk is wrong about GDP

https://timharford.com/wp-content/uploads/2021/01/Back_View-DD@0.5x-1-1024x654.png
Elon Musk suggested excluding government spending from GDP to measure economic progress more accurately. However, this idea is flawed as GDP measures all goods and services produced, not just those that make people's lives better.

Uber raises in-office requirement to 3 days, claws back remote workers

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Uber is requiring employees to work in the office three days a week starting in June. The company is also changing its remote work policy and sabbatical program.

Help ChatGPT discover your products

ChatGPT now includes product recommendations in search results, chosen independently and not as ads. To be discoverable in ChatGPT, ensure OAI-SearchBot access by updating robots.txt if necessary.

FTC's 'Tech Censorship' Investigation Is Censoring Comments About 'Censorship'

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The FTC is censoring public comments about censorship, blocking submissions for profanity and inappropriate content, despite investigating tech platforms for similar moderation decisions. This irony suggests the FTC may be practicing the same content moderation it's supposed to be investigating.

A cheat sheet for why using ChatGPT is not bad for the environment

Using ChatGPT has a negligible environmental impact, equivalent to stopping a shower for 1 second. Worrying about personal ChatGPT use is a waste of time that could be spent on real climate change issues.

Amazon Doesn't Want You to Know How Much the Trade War Costs

https://assets.bwbx.io/images/users/iqjWHBFdfxIU/ijui0r4p5cVk/v1/piUjdcePl62Og/160x160.jpg
Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world

What Happens When There Are No Deals? – Paul Krugman

https://substackcdn.com/image/fetch/w_520,h_272,c_fill,f_auto,q_auto:good,fl_progressive:steep,g_auto/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F8e51145a-91f9-4837-809f-12567d5c8a95_1000x533.jpeg
The author discusses Trump's fantasy of trade dominance and how it's unsustainable due to failed negotiations and ridicule from China. The author fears Trump's remaining 1364 days in office could cause significant damage.

Ask HN: AI Replacing Engineers – Firsthand Stories?

The user, a mid to high skill developer at a FAANG-like company, shares firsthand experience with AI tools like Gemini and Claude Code, which have increased their efficiency by 2-3x, but notes that AI is not a replacement for human engineers, rather a tool to augment their work. The user believes that AI will lead to a shift in job roles, with a focus on shipping and high-level thinking, ...

Amazon Wants to Be a Satellite-Internet Powerhouse. It Has a Long Way to Go

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Show HN: Rad Type - Can we make gamepad typing fast?

https://www.tyleo.com/img/forza-7-car-select-1387c849.png
Rad Type is a new gamepad keyboard with a hardware-centric design, allowing users to type faster than traditional gamepad interfaces. It features two circles with alphabet characters arranged in rings, enabling users to input characters by moving the thumbstick in the desired direction.

How the April 28, 2025 power outage in Portugal/Spain impacted Internet traffic

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A massive power outage struck Portugal and Spain on April 28, causing significant disruptions to transportation, businesses, and Internet services. Internet traffic in both countries dropped sharply, with Portugal's traffic falling by half and Spain's by 60% within hours.

Vibe Coding: Developer Slot Machines (Cursor, Windsurf)

https://prototypr-media-backup.nyc3.digitaloceanspaces.com/strapi/75bf237bdf9c79b83aafa1a903206923.png
User has mixed experience with Cursor, finding performance inconsistent and frustrating at times. They're considering switching to Windsurf due to its potential to outperform Cursor.

Implement Flash Attention Back End in SGLang – Basics and KV Cache

https://hebiao064.github.io/assets/fa3-basics/slack-announcement.png
The author implemented the Flash Attention Backend end-to-end in SGLang and shares insights on how to implement an attention backend in LLM serving engines, including the use of CUDA Graph for performance optimization. The author also shares their experience contributing to the SGLang project and provides tips for MLSys enthusiasts who want to start contributing to open source projects.

Spain and Portugal power outage: what caused it, and was there a cyber-attack?

https://i.guim.co.uk/img/media/ce650603bdfd5d689c0f97ffd62aeb1bcc9cc8b7/0_0_3500_1981/master/3500.jpg?width=445&dpr=1&s=none&crop=none
A massive power cut hit Spain, Portugal and south-west France on Monday, affecting millions and prompting a scramble to fix it. The outage was caused by a rare atmospheric phenomenon that led to a severe imbalance in temperatures, causing synchronisation failures between electrical systems.

An Ode to the Thigh (2024)

https://ponnekanti.net/favicon/web-app-manifest-512x512.png
The user dissected the thigh and found it to be their favourite dissection due to its intricate structure and beautiful layers. The thigh's arrangement is a remarkable example of form and function, with the fascia lata working in harmony with the muscles to aid venous return.

Show HN: Neurox – GPU Observability for AI Infra

https://camo.githubusercontent.com/d2b3dd25fd55eb4c09f2f592badc41997fdca385b976eb17ee6d500c0428eb43/68747470733a2f2f6e6575726f782e636f6d2f696d616765732f3637616635626630633061383136633361353931663664365f636c7573746572732e706e67
Neurox is a self-hosted AI workload monitoring tool for Kubernetes GPU clusters, offering free monitoring for up to 64 GPUs. It requires an existing Kubernetes cluster with at least 1 NVIDIA GPU and specific dependencies for installation.

GenZ grads say college degrees a waste of time/money as AI gets into workplaces

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Gen Z job seekers feel their degrees are obsolete due to AI, with 49% saying college education has lost value. Employers now prioritize AI skills over traditional degrees, forcing young workers to adapt and upskill.

Drinking champagne could reduce risk of sudden cardiac arrest, study suggests

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A study found that lifestyle changes such as eating more fruit, staying slim, and maintaining a positive outlook may reduce sudden cardiac arrest risk by 40-63%. Researchers identified 56 non-clinical risk factors associated with SCA, including champagne and white wine consumption.

Beyond Performance: Measuring the environmental impact of analytical databases

https://arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png
Researchers developed ATLAS to measure database systems' environmental impact, considering operational and manufacturing costs. Their findings show architectural choices significantly affect power consumption and sustainability, with deployment location being a critical factor.

CNCF tells main NATS contributor Synadia that it's free to fork off

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CNCF has filed a petition to prevent Synadia from using the NATS logo and domain due to licensing changes. Synadia wants to change NATS from Apache 2.0 to Business Source License, but CNCF claims ownership of the trademark and logo assets.

Google Wallet integrates zero-knowledge proofs for identity

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Google Wallet is expanding digital ID capabilities, allowing users to save government-issued IDs and use them for various services. The platform is also integrating Zero Knowledge Proof technology for age verification and expanding to 50 more countries.

Programming languages should have a tree traversal primitive

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The user proposes a new control flow construct called "for_tree" to handle tree-like traversal in a more convenient way, similar to how for/foreach loops handle linear traversal. This construct would allow for easy traversal of trees without the need for recursive functions or iterators, and would offer additional benefits such as the ability to use break, continue, and return statements.