Fascinating Cab Numbers: Unraveling a Mathematical Puzzle

2025-01-21

This article delves into the mathematical enigma of 'Cab numbers,' which are numbers formed by the product of two factors whose digits, excluding zero, combine to form the same digits as the product. The article presents methods for solving Cab numbers with 3 to 9 digits, providing the count, minimum, and maximum values for each digit range. The author utilizes a Fortran program to compute these Cab numbers, analyzing the properties of their digital roots. The article concludes by listing some results and extending the exploration to scenarios involving three or more factors.

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Misc

Microsoft to Shutter Skype? The End of an Era?

2025-02-28
Microsoft to Shutter Skype?  The End of an Era?

Reports suggest Microsoft is preparing to shut down its long-standing communication app, Skype, in the coming months. A hidden string in the latest Skype for Windows preview hints at a May shutdown, prompting users to switch to Teams. Once a dominant VoIP platform, Skype has faced stiff competition from newer apps like Telegram and WhatsApp. Despite integration attempts within the Microsoft ecosystem, Skype has struggled to maintain relevance. The move appears to be a strategic shift towards consolidating users on the Teams platform.

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Tracking the ISS with a repurposed IR Turret

2025-04-05

Using a HackPack IR turret received as a birthday gift, the author created a device that tracks the International Space Station (ISS) in real-time. By fetching Two-Line Element (TLE) data for the ISS and using the SGP4 algorithm to calculate its position, the author converted this into azimuth and elevation angles to control stepper and servo motors. The project involved astronomy calculations, embedded programming, and 3D modeling, showcasing creativity and technical skills. It offers a unique observation tool for amateur astronomers.

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Hardware

sxwm: Minimal, Fast, Configurable Tiling Window Manager for X11

2025-05-04
sxwm: Minimal, Fast, Configurable Tiling Window Manager for X11

sxwm is a lightweight X11 tiling window manager prioritizing minimalism, speed, and configurability. It seamlessly switches between tiling and floating layouts, boasts 9 workspaces, and features a user-friendly configuration file (sxwmrc) requiring no C programming knowledge. Supporting mouse interactions, multi-monitor setups, and integration with tools like sxbar, sxwm delivers a highly efficient and responsive window management experience. Its key strengths lie in its incredibly low resource usage and blazing-fast performance.

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Development

BiomeJS: A New Contender in JavaScript Code Formatting and Linting

2025-05-07
BiomeJS: A New Contender in JavaScript Code Formatting and Linting

BiomeJS is a rising star in the JavaScript ecosystem, challenging the dominance of Prettier and ESLint. This ambitious project combines code formatting and linting into a single, high-performance solution built with Rust. It boasts significantly improved speed, outperforming its predecessors by an order of magnitude. While offering similar functionality to Prettier and ESLint, BiomeJS currently lags in support for some frameworks and file types. Its ease of setup, intuitive error messages, and performance gains make it a compelling alternative, though it's still maturing compared to established tools.

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Development

Microsoft Kills Free VPN in Defender After Price Hike

2025-02-02
Microsoft Kills Free VPN in Defender After Price Hike

Microsoft's free VPN feature in Microsoft Defender, included with Microsoft 365 Personal and Family subscriptions since 2023, is being discontinued on February 28, 2025. This announcement follows a recent price increase for Microsoft 365 subscriptions, leaving users feeling shortchanged. While the price hike includes the new AI-powered Copilot, many consider the loss of the convenient VPN a significant drawback.

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Tech

Paying Peer Reviewers: Faster Reviews, Same Quality?

2025-03-31
Paying Peer Reviewers: Faster Reviews, Same Quality?

Two recent studies suggest that paying peer reviewers around $250 can significantly speed up the review process without compromising quality. An experiment by *Critical Care Medicine* showed that offering payment increased acceptance rates and review speed. *Biology Open* conducted a similar experiment with higher payment amounts, yielding similar results. While the studies are small-scale, they provide initial data on paid peer review, sparking debate about this model and its potential impact on scientific publishing.

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Tech payment

Physicists Develop Mathematical Model to Predict Bowling Ball Trajectories

2025-04-16
Physicists Develop Mathematical Model to Predict Bowling Ball Trajectories

With over 45 million bowling fans in the US, improving strike percentage is a constant pursuit. A team of physicists, including three skilled bowlers and a Team England coach, has developed a mathematical model to predict bowling ball trajectories. The model accounts for lane oil composition and patterns, ball asymmetries, and player variability, offering a more nuanced approach than previous statistical analyses. The complexity stems from numerous variables influencing the ball's path, such as inconsistent oil application on lanes. This research provides a new perspective for enhancing bowling performance by leveraging physics and mathematics.

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ELK is Outdated? GreptimeDB: The Next-Gen Cloud-Native Log Storage Solution

2025-04-28
ELK is Outdated? GreptimeDB: The Next-Gen Cloud-Native Log Storage Solution

With the explosive growth of log data, the traditional ELK architecture reveals problems such as high storage costs, severe resource waste, and complex maintenance. This article introduces GreptimeDB, a cloud-native database that uses a storage-compute separation architecture, offering advantages such as high compression rates, lightweight design, and easy maintenance. It demonstrates the complete process of log collection, storage, parsing, and querying by combining it with Vector, providing a more modern solution for real-time log monitoring and data analysis.

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Development log storage

Browser Blocking Port 6000? Cross-Protocol Scripting Vulnerability Strikes!

2025-05-15
Browser Blocking Port 6000?  Cross-Protocol Scripting Vulnerability Strikes!

While working on a Docker and Flask project, the author encountered an issue where port 6000 was inaccessible, while port 8000 functioned correctly. Investigation revealed that browsers actively block certain ports, including 6000, as a security measure against Cross-Protocol Scripting (XSS) vulnerabilities. Chrome displays an ERR_UNSAFE_PORT error, Safari shows a blank page, and Firefox provides a more informative "This address is restricted" message. The browser cancels requests to these ports before they are even sent. The author confirmed the server was functioning correctly using curl, isolating the issue to browser security policies. The article lists Firefox's blocked ports and their services, explaining how this protection works.

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Development Browser Security

Apple Pulls Advanced iCloud Data Protection from UK After Government Backdoor Demand

2025-02-21
Apple Pulls Advanced iCloud Data Protection from UK After Government Backdoor Demand

Apple has withdrawn its Advanced Data Protection (ADP) iCloud feature from the UK following a government mandate for backdoor access to encrypted user data. The UK government, via a technical capability notice under the Investigatory Powers Act, demanded unrestricted access to encrypted iCloud content globally. Apple, prioritizing user security over compliance, chose to remove ADP rather than create a backdoor, citing the risk of malicious actors exploiting such access. While this affects iCloud data backups, other Apple services like iMessage and FaceTime remain end-to-end encrypted. The decision highlights the ongoing tension between government surveillance and user privacy in the digital age.

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Tech

Red Hat Undercuts VMware With OpenShift Virtualization Engine

2025-01-16
Red Hat Undercuts VMware With OpenShift Virtualization Engine

Following Broadcom's acquisition of VMware and subsequent pricing changes, many enterprise users are seeking alternatives. Red Hat is capitalizing on this with the launch of OpenShift Virtualization Engine (OVE), a virtualization-focused platform designed to attract VMware customers. OVE leverages the OpenShift platform, removing container capabilities to provide a pure virtualization solution. Integrated with Advanced Cluster Management (ACM) and Ansible automation, OVE simplifies VM migration and management. Red Hat also offers migration tools and professional services to ease the transition, particularly for large enterprises with substantial VM deployments.

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Tech

Tech Giants Unite to Support Open-Source Chromium Development

2025-01-09
Tech Giants Unite to Support Open-Source Chromium Development

The Linux Foundation launched the "Supporters of Chromium-Based Browsers" initiative, backed by Google, Microsoft, Meta, and Opera. This initiative aims to fund and support the open development of Chromium projects, fostering collaboration between developers, academia, and tech companies to ensure the sustainability and innovation of the ecosystem. Operating on an open governance model, the project prioritizes transparency and community involvement. This move is seen as crucial for securing the future of Chromium-based browsers and promoting greater collaboration within the tech industry.

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Development Linux Foundation

Benchmarking RSA Key Generation: A Battle Against Probability

2025-01-03
Benchmarking RSA Key Generation: A Battle Against Probability

RSA key generation, while conceptually simple, is notoriously difficult to implement and benchmark. This article cleverly uses mathematical methods to overcome the noisy results typical of statistical approaches. By pre-generating a representative sequence of candidate numbers, the author provides a more stable and reliable benchmarking methodology for comparing different implementations. The article details the mathematical underpinnings of RSA key generation and shares the script and data used to generate the average candidate sequence, facilitating testing and comparison by readers.

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Tesla Found Partially Liable in Autopilot Wrongful Death Case

2025-08-03
Tesla Found Partially Liable in Autopilot Wrongful Death Case

A Miami federal jury has found Tesla partially liable in a 2019 wrongful death lawsuit involving its Autopilot system. George McGee, driving a Tesla Model S with Autopilot engaged, ran a stop sign and crashed into a couple, killing Naibel Benavides and severely injuring Dillon Angulo. While Tesla argued McGee was solely responsible, the jury determined Tesla bore one-third of the liability for selling a defective vehicle, awarding plaintiffs $129 million in compensatory damages and $200 million in punitive damages. This marks the first time a jury has found Tesla liable in a wrongful death case involving Autopilot.

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Tech

arXivLabs: Experimental Projects with Community Collaborators

2025-09-10
arXivLabs: Experimental Projects with Community Collaborators

arXivLabs is a framework enabling collaborators to develop and share new arXiv features directly on the website. Individuals and organizations involved uphold arXiv's values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only partners with those who share them. Have an idea for a valuable project for the arXiv community? Learn more about arXivLabs.

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Development

Breakthrough Nanosensor Monitors Iron in Living Plants

2025-03-11
Breakthrough Nanosensor Monitors Iron in Living Plants

Researchers at the Singapore-MIT Alliance for Research and Technology (SMART) have developed a groundbreaking near-infrared (NIR) fluorescent nanosensor capable of simultaneously detecting and differentiating between Fe(II) and Fe(III) in living plants. This real-time, non-destructive sensor enables precise monitoring of iron uptake, transport, and transformations, offering insights into plant nutrition and informing precise fertilization strategies. The technology, applicable to various plant species, promises advancements in agriculture and beyond, with potential applications in environmental monitoring and health sciences.

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BuzzBench: Seamless Performance Testing for Your Workflow

2025-04-04
BuzzBench: Seamless Performance Testing for Your Workflow

BuzzBench offers a complete performance testing solution that integrates directly into your workflow and development pipeline. Deploy lightweight agents anywhere with a single command to test production locally, verify staging environments in CI/CD, or monitor your entire infrastructure. It boasts flexible test configuration, detailed analytics (response times, throughput, success rates), and automatic, rapid reporting. Historical tracking allows comparison against previous tests, enabling proactive identification of performance issues and the establishment of baselines and alerts.

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Development CI/CD integration

A 16-Year-Old's Transputer OS: A 1995 Retrocomputing Odyssey

2025-03-13
A 16-Year-Old's Transputer OS: A 1995 Retrocomputing Odyssey

In 1995, a 16-year-old author built a self-contained operating system for a Transputer using only 128KB of RAM. This ambitious project included a basic OS, text editor, Small-C compiler, and assembler. He painstakingly extended the compiler, eventually running complex programs like a chess program from the IOCCC and a ray tracer. A 3D polygonal modeler was also developed. Years later, the author revisited this project, detailing the challenges of restoring the OS, including byte order issues, memory management, and floating-point errors. The article culminates in a successful emulation of the OS and provides instructions to rebuild it. This story showcases impressive ingenuity and perseverance in the face of limited resources.

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s3mini: Blazing Fast and Tiny S3 Client for Edge

2025-06-11
s3mini: Blazing Fast and Tiny S3 Client for Edge

s3mini is an ultra-lightweight (~14KB minified) TypeScript client for S3-compatible object storage, boasting ~15% faster operations per second than alternatives. It runs on Node.js, Bun, Cloudflare Workers, and other edge platforms, tested with Cloudflare R2, Backblaze B2, DigitalOcean Spaces, and MinIO. Featuring essential S3 APIs (put, get, delete, list, etc.) and AWS SigV4 support (no pre-signed URLs needed), s3mini is zero-dependency and perfect for resource-constrained environments. Browser support is not provided.

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Development

Trump Admin's Illegal Purge of Inspectors General Sparks Outrage

2025-02-01
Trump Admin's Illegal Purge of Inspectors General Sparks Outrage

Last Friday, President Trump abruptly fired multiple agency inspectors general, including Phyllis Fong at the USDA. Fong, a 22-year veteran with numerous awards and key roles, was escorted from the building after refusing to comply with what she deemed an illegal order. The firings have sparked outrage, with CIGIE chairman Hannibal Ware stating they appear to violate federal law. Senator Adam Schiff called the actions illegal, and even Republican Senator Chuck Grassley expressed concern. However, Democrats' slow response raises questions about the effectiveness of checks and balances. This incident highlights the Trump administration's attack on oversight and the vulnerability of institutional safeguards.

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GribStream: A Fast and Efficient Historical Weather Forecast API

2024-12-20
GribStream: A Fast and Efficient Historical Weather Forecast API

GribStream is a fast, efficient, and easy-to-use historical weather forecast API leveraging the National Blend of Models (NBM) and the Global Forecast System (GFS). It provides access to massive historical weather data; a single HTTP request can retrieve tens of thousands of hourly data points for months in seconds. The API supports various output formats (CSV, Parquet, JSON, etc.) and location queries. Its cost-effective pricing and powerful features allow developers to easily access the data they need without downloading and archiving.

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Development historical data

Constant-Time Sliding Window Aggregation: A Refined FIFO

2025-08-20

This post presents a refined FIFO data structure enabling constant-time sliding window aggregation. Traditional approaches using dual-stack structures prove inefficient. The author introduces a novel method, cleverly managing 'ingestion' and 'excretion' lists with their running and suffix products, to achieve aggregation over arbitrary monoids with worst-case constant-time complexity. This avoids the extensive copying and redundancy of prior methods, offering significant practical advantages. Python code is included for implementation.

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(pvk.ca)
Development

Hard Drives Make a Comeback in Green Data Centers

2025-05-19
Hard Drives Make a Comeback in Green Data Centers

A Seagate report highlights energy usage as a top concern for over half of business leaders, advocating for smarter disk utilization in data centers. Projecting a 165% increase in global data center power demand by 2030 (Goldman Sachs), the report emphasizes the pressure on organizations to balance rising data volumes, slowing power efficiency gains, and AI adoption with carbon emissions, infrastructure expansion, and TCO. Seagate proposes a fundamental shift: viewing data infrastructure as an opportunity to optimize both cost and sustainability. Comparing the embodied carbon of disk, SSD, and tape, the report finds hard drives to have the lowest carbon footprint. Three strategic pillars for a sustainable data future are suggested: technological innovation, lifecycle extension and circularity, and ecosystem-wide accountability. Seagate's HAMR technology is showcased, achieving triple capacity and over 70% reduction in per-TB carbon emissions. Sustainability, the report concludes, requires a holistic approach encompassing infrastructure, lifecycle management, and industry collaboration.

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Text-Based TUI Matrix Application: A Nestable Text Desktop Environment

2025-03-07
Text-Based TUI Matrix Application: A Nestable Text Desktop Environment

This is a text-based application where the entire user interface is a mosaic of text cells forming a TUI matrix. The resulting TUI matrix renders either into its own GUI window or a compatible text console. It can wrap any console application and nest indefinitely, creating a text-based desktop environment. Supports Windows, Unix, Linux, macOS, FreeBSD, NetBSD, OpenBSD, and more. Currently, native GUI window rendering is only available on Windows; Unix platforms require a terminal emulator.

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Development text interface

California Ballot Initiative Inspired by Murder Seeks to Reform Healthcare Insurance

2025-03-31
California Ballot Initiative Inspired by Murder Seeks to Reform Healthcare Insurance

A proposed California ballot initiative, informally named after the alleged assassin of UnitedHealthcare CEO Brian Thompson, aims to prevent insurers from delaying or denying doctor-recommended treatments. The initiative, filed by a retired attorney, is fueled by public anger over the healthcare insurance industry following the CEO's murder. The proposal would make it a felony for non-physicians to review physician-recommended treatments and requires physician review for any denial. The initiative is currently under review and requires significant public support to appear on the ballot.

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Apple Paper Delivers a Blow to LLMs: Tower of Hanoi Exposes Limitations

2025-06-08
Apple Paper Delivers a Blow to LLMs: Tower of Hanoi Exposes Limitations

A new paper from Apple has sent ripples through the AI community. The paper demonstrates that even the latest generation of "reasoning models" fail to reliably solve the classic Tower of Hanoi problem, exposing a critical flaw in the reasoning capabilities of Large Language Models (LLMs). This aligns with the long-standing critiques from researchers like Gary Marcus and Subbarao Kambhampati, who have highlighted the limited generalization abilities of LLMs. The paper shows that even when provided with the solution algorithm, LLMs still fail to solve the problem effectively, suggesting their "reasoning process" isn't genuine logical reasoning. This indicates that LLMs are not a direct path to Artificial General Intelligence (AGI), and their applications need careful consideration.

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AI

Jetrelay: A Highly Efficient Pub/Sub Server Leveraging Linux Kernel Features

2025-05-16

Jetrelay, a pub/sub server compatible with Bluesky's jetstream, achieves impressive efficiency with only 500 lines of code. By cleverly utilizing Linux kernel features like `sendfile()`, `io_uring`, and `fallocate()`, Jetrelay broadcasts data and manages persistent storage with minimal user-space overhead. This allows it to saturate a 10Gbps network connection using just 8 CPU cores. The design avoids unnecessary data copies and uses asynchronous I/O to handle thousands of concurrent client connections effectively.

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Development

arXivLabs: Experimental Projects with Community Collaborators

2025-02-07
arXivLabs: Experimental Projects with Community Collaborators

arXivLabs is a framework enabling collaborators to develop and share new arXiv features directly on the website. Individuals and organizations involved uphold arXiv's values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners who share them. Have an idea to improve the arXiv community? Learn more about arXivLabs.

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Development

Why Are Apps So Desperate for You to Download Them?

2025-07-26
Why Are Apps So Desperate for You to Download Them?

The 2010s were the Wild West of mobile, with "mobile-first" the buzzword. Now, in 2025, the push for app downloads is relentless. This article explores the reason: data. Apps offer far deeper access to your device and information (contacts, location, microphone, installed apps) than websites, allowing companies to create more comprehensive user profiles. Websites, limited by browser constraints, can't match this level of data collection. The next time you're prompted to download an app, consider the privacy implications; your data and control are at stake.

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Tech user data
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