Topological Sort Algorithm Variant: Efficiently Handling Dependencies

2025-04-03
Topological Sort Algorithm Variant: Efficiently Handling Dependencies

This article presents an improved topological sorting algorithm based on Kahn's algorithm, but it treats nodes as sets instead of individual nodes. The algorithm iteratively finds the root sets of the graph, removes them, and repeats until the graph is empty. The order of the removed root sets forms a topological order, and nodes within the same root set are independent and can be processed in parallel. The algorithm can also detect cycles and return a partial topological ordering instead of completely aborting.

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LLM Performance on Advent of Code 2024: A Surprise

2024-12-30
LLM Performance on Advent of Code 2024: A Surprise

This post details an experiment testing several leading Large Language Models (LLMs) on the 2024 Advent of Code challenge. Surprisingly, the LLMs performed worse than expected, even underperforming the author. A simple framework was used, providing the models with the complete problem description and requiring executable Python code. Results showed frequent timeouts and exceptions, suggesting LLMs excel at solving familiar problems but struggle with novel ones. This limitation might stem from reliance on program templates, insufficient computational resources, or suboptimal prompting. The experiment highlights Advent of Code as a potential benchmark for evaluating coding agents.

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Metamorphic Rocks: Messengers from Earth's Depths

2024-12-27
Metamorphic Rocks: Messengers from Earth's Depths

This essay explores the incredible journeys of metamorphic rocks. Starting as humble seabed sediments, these rocks are buried deep within the Earth's crust, undergoing intense heat and pressure that transforms them into new mineral forms. Their eventual return to the surface provides invaluable insights into the planet's deep interior. The author vividly describes this transformation as an epic journey, highlighting the importance of metamorphism in plate tectonics and the crucial role of water in the process. The story also contrasts the ease of exploring space with the challenges of accessing Earth's subsurface.

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I Tracked Myself Using Leaked Geolocation Data: A Shocking Experiment

2025-02-02
I Tracked Myself Using Leaked Geolocation Data: A Shocking Experiment

A recent geolocation data leak from Gravy Analytics exposed over 2000 apps secretly collecting location data, often without developers' knowledge. To investigate, I installed a single game and used Charles Proxy to monitor network traffic. Even with location services disabled, the game leaked my approximate location and IP address via Unity Ads, Facebook, and other ad platforms. The data included surprisingly granular details like screen brightness and memory usage. Further investigation revealed the ease of purchasing datasets linking identifiers to personal information, enabling precise location tracking. This experiment highlights the alarming scale of data leakage in the mobile advertising ecosystem and the significant risks to user privacy.

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R0ML's Ratio: Avoid the Bozo Trap in Enterprise Software Licensing

2025-08-10

This article introduces a clever methodology for evaluating volume purchases: R0ML's Ratio. Using the example of buying thousands of clown noses, it explains how to calculate the ratio: divide the total purchase price by the full retail price of all units. A ratio under 1 indicates a good deal; above 1 means you've been had. This is especially crucial for software and SaaS licensing, where accurately estimating usage is key to avoiding losses from underutilization. The author suggests empowering employees with corporate cards for individual software purchases as a safer alternative.

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Hacking Your Starlink Mini: Removing the Internal WiFi Router

2025-06-15

This guide details how to remove the integrated Wi-Fi router from a Starlink Mini 1 terminal, enabling Ethernet-only operation. This modification unlocks greater flexibility for advanced users with custom networking needs, embedded installations, or power-constrained environments. The guide provides a step-by-step disassembly process, PCB connector pinouts, a direct Ethernet connection schematic, network configuration instructions, and explanations of gRPC status codes for troubleshooting. Caution: This modification is only for the Starlink Mini 1, and removing the metal plate is strongly discouraged due to potential cooling and EMI issues.

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Hardware

Info Warfare: Truth and Digital Risks in the Next Conflict

2025-03-09
Info Warfare: Truth and Digital Risks in the Next Conflict

In war, truth is often the first casualty. In the next major conflict, virtually all information could be a victim. Over-reliance on digital communication exposes Western societies to significant risks, as seen in Ukraine's experience with Russia. Hacker groups (both military and criminal) have infiltrated television, the internet, and streaming radio, spreading disinformation, launching denial-of-service attacks, and jamming GPS signals, posing a serious challenge to societal narratives and stability.

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The Sackler Brothers and LSD: A Tale of Ideals and Profits

2025-01-30
The Sackler Brothers and LSD: A Tale of Ideals and Profits

This article unveils the little-known story of the Sackler brothers' involvement in early LSD research during the 1950s. Initially driven by the idealistic goal of curing mental illness, they actively participated in early LSD trials, attempting to link LSD research to their own hormonal imbalance theories. However, over time, their focus shifted to the commercial potential of pharmaceuticals, ultimately leading to infamy for developing and marketing OxyContin. The article highlights the conflict between idealism and profit motives, and the ethical and commercial considerations in technological advancement.

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C++-style OOP in C: Kernel Services via Function Pointers

2025-08-27
C++-style OOP in C: Kernel Services via Function Pointers

This article details how the author implemented a virtual table (vtable) mechanism in their operating system kernel using C's function pointers and structs, mimicking object-oriented programming. This approach enables unified management of kernel services like starting, stopping, and restarting, and allows for flexible scheduling policy changes without extensive code modification. The author explains the implementation and application of vtables with examples of device drivers and service management, discussing the advantages and disadvantages. While the C syntax leads to slightly verbose code, this method enhances readability and maintainability, improving kernel flexibility and extensibility.

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Development

Are Americans' Perceptions of the Economy and Crime Broken?

2025-01-26
Are Americans' Perceptions of the Economy and Crime Broken?

Americans' views on the economy and crime are increasingly partisan, creating a disconnect between perception and reality. Despite positive economic indicators, many believe the economy is failing; similarly, despite a decades-long decline in crime, most believe it's rising. This is especially pronounced in the 2024 election cycle. The article introduces the Real-Time Crime Index, a project aiming for a more accurate, near real-time picture of crime trends by aggregating data from hundreds of police agencies. While acknowledging data imperfections, the index reveals declines in murders and violent crime, contradicting public perception. The author argues that media plays a crucial role in shaping public opinion and should strive for more objective, transparent reporting to mitigate partisan biases.

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JavaScript: The Progress That Broke the Web

2025-06-20
JavaScript: The Progress That Broke the Web

This article critiques the overuse of JavaScript frameworks in modern web development. The author argues that the pursuit of app-like experiences has led developers to employ overly complex frameworks and tools, resulting in slow loading times, difficult maintenance, and impaired user experience and SEO. Many website functionalities, the article claims, could be achieved with simpler code, while overly complex architectures reduce efficiency. The author calls for a return to simplicity, prioritizing user experience and performance over technical showmanship.

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Development

Tesla Paid Zero Federal Taxes in 2024 Despite $2.3 Billion in Income

2025-01-31
Tesla Paid Zero Federal Taxes in 2024 Despite $2.3 Billion in Income

Despite earning $2.3 billion in 2024 and being the world's most valuable car company, Tesla paid zero federal income taxes, according to new reports. Over the past three years, Tesla's average tax rate was a mere 0.4%, significantly lower than the statutory 21% corporate tax rate. This is attributed to tax avoidance strategies like accelerated depreciation and unspecified US tax credits. The revelation sparks debate about the US tax system's favoritism towards corporations and the wealthy, and the ease with which billionaires can avoid paying their fair share.

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Microsoft Locks Out Older Intel CPUs from Windows 11 24H2

2025-02-25
Microsoft Locks Out Older Intel CPUs from Windows 11 24H2

Microsoft's published CPU support list for Windows 11 24H2 confirms that only 11th-generation Intel CPUs and later are supported. This means OEMs can no longer build new PCs with older Intel chips for Windows 11 24H2. While the restriction applies to OEMs, it has sparked concerns among users about future hardware compatibility. Although Microsoft's official hardware compatibility list currently supports older CPUs (e.g., 8th, 9th, and 10th gen Intel chips), this change could signal further tightening of hardware requirements in the future.

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Nvidia Delays RTX 5070, Setting the Stage for AMD's Radeon RX 9070 Showdown

2025-02-14
Nvidia Delays RTX 5070, Setting the Stage for AMD's Radeon RX 9070 Showdown

Nvidia's RTX 5070, boasting RTX 4090-level performance at $549, has been delayed from February to March 5th. This sets the stage for AMD's upcoming Radeon RX 9070 and 9070 XT launch on February 28th. AMD's strategy appears to focus on price competitiveness against Nvidia's RTX 4070 Ti and 4070 Super, rather than directly challenging the top-tier cards. However, Nvidia's substantial profits give it considerable leeway to respond. Rumors persist of a more powerful AMD card with 32GB of RAM, though this remains unconfirmed. The GPU battle heats up!

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Hardware

Rust vs. Ada: A Memory Safety Showdown

2025-02-10

This article compares Rust and Ada's effectiveness in preventing common memory-related errors. Rust excels at preventing errors outright, but Ada's avoidance of dynamic memory allocation and support for formal proof of correctness help avoid many errors altogether. The article delves into common memory errors like leaks, buffer overflows, use-after-free, double-free, and race conditions, comparing how each language handles them. While Rust boasts stronger compile-time checks, Ada's static analysis capabilities and stricter pointer control offer a compelling alternative. Ultimately, the author finds both languages offer unique strengths: Rust prioritizes compile-time safety, while Ada emphasizes preventing errors from occurring in the first place.

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Development

Missile Strike Confirmed as Cause of Azerbaijan E190 Crash

2024-12-28
Missile Strike Confirmed as Cause of Azerbaijan E190 Crash

An Azerbaijan Airlines Embraer E190 passenger plane crashed on Christmas Day, killing 38 people. The Azerbaijani government confirmed that a Russian Pantir-S1 surface-to-air missile caused the crash. The aircraft was attempting an emergency landing when it went down. Russian air defense forces were engaged in shooting down Ukrainian drones in the area, but civilian airspace wasn't closed. Despite pilot requests for an emergency landing, the plane was denied access to Russian airports and crashed near Aktau, Kazakhstan.

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Rocky Linux Hardened: Enterprise-Grade Linux Bolstered for Mission-Critical Systems

2025-03-21
Rocky Linux Hardened: Enterprise-Grade Linux Bolstered for Mission-Critical Systems

Rocky Linux Hardened, from CIQ, is optimized for mission-critical environments demanding robust security. Delivered via a secure supply chain, it features memory corruption detection, kernel integrity checking, enhanced password policies, and SSH restrictions. This minimizes zero-day and CVE risks by reducing attack surfaces and common exploit vectors. Advanced threat detection utilizes Linux Kernel Runtime Guard (LKRG) to identify sophisticated intrusions. Security threats are addressed proactively, minimizing exposure time. Strong access controls are implemented via advanced password hashing, strict authentication, and hardened access. Pre-hardened systems streamline deployment, saving time and resources. Compatibility simplifies migration from other Enterprise Linux distributions, reducing vendor lock-in.

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Minimizing Wifi Battery Drain in IoT Projects

2024-12-22
Minimizing Wifi Battery Drain in IoT Projects

In the early development of PetDrifts, an IoT device using an ESP32 C3, battery life was a major challenge, lasting only a day. The culprit was identified as high power consumption during HTTP POST requests every 15 minutes. To address this, the team explored two solutions: switching from TCP to UDP to reduce network overhead, and adopting MQTT for persistent connections and lower power usage. While improvements were observed, the battery life wasn't sufficient. Ultimately, they opted for a Bluetooth MCU to achieve significantly longer battery life.

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Development IoT Power Optimization

Litestack: All-in-One Data Infrastructure Gem for Ruby on Rails

2024-12-23
Litestack: All-in-One Data Infrastructure Gem for Ruby on Rails

Litestack is a Ruby gem offering a comprehensive data infrastructure solution for Ruby and Ruby on Rails applications. Leveraging SQLite's power, it integrates a full-fledged SQL database, a fast cache, a robust job queue, a reliable message broker, a full-text search engine, and a metrics platform—all in one package. Unlike traditional approaches requiring separate servers and databases, Litestack delivers superior performance, efficiency, ease of use, and cost savings. Its embedded database and cache reduce memory and CPU usage, while its streamlined interface simplifies development. It seamlessly integrates with ActiveRecord and Sequel and automatically optimizes for Fiber-based I/O frameworks.

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Development Data Infrastructure

Warm Nights: The Silent Killer of Plant Growth

2025-08-23

This article explores the impact of warm nights on plant growth. Plants, like animals, respire, burning sugars for energy. When the sugars produced through photosynthesis are insufficient to meet the demands of respiration, the plant will eventually die. Warm nights accelerate respiration, causing plants to consume more energy, ultimately leading to poor growth and even death. This is particularly detrimental to plants from cool climates. The article uses tomatoes as an example to illustrate the negative effects of warm nights on plant growth and explains the differences in efficiency of various photosynthetic types (C3, C4, CAM) at different temperatures.

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SepLLM: Inference Acceleration for LLMs by Compressing Meaningless Tokens

2025-03-06
SepLLM: Inference Acceleration for LLMs by Compressing Meaningless Tokens

Large Language Models (LLMs) face significant challenges due to their massive computational demands. Researchers discovered that certain meaningless special tokens contribute disproportionately to attention scores. Based on this, they propose SepLLM, a framework that accelerates inference by compressing segments between these tokens and dropping redundant ones. Experiments show SepLLM achieves over 50% reduction in KV cache on the GSM8K-CoT benchmark with negligible performance loss using Llama-3-8B. In streaming settings, SepLLM effectively handles language modeling with up to 4 million tokens or more.

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Vim: A Programming Language Beyond an Editor

2024-12-15

Vim is more than just a text editor; it's a language for interacting with your computer. Its concise and efficient command structure is easy to learn and remember, and also easy for a computer to interpret. While Vim itself is powerful, its core strength lies in the fact that its mode has been integrated into almost every mainstream code editor, allowing developers to flexibly choose their preferred editor interface while retaining Vim's efficient command language. Therefore, NeoVim, as the most complete and consistent implementation of the Vim language, is valuable for providing this efficient editing language, not just the editor itself.

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Development editor

NoteUX: A Beautifully Designed Note-Taking App

2025-03-31

NoteUX is a beautifully designed note-taking app that helps you quickly capture, organize, and optimize your thoughts effortlessly. Its clean interface features multiple scratch pads, dark mode, fullscreen mode, auto-save, word count, and the ability to download notes as .txt files. Perfect for writers, students, and professionals alike, NoteUX enhances productivity and creativity.

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Development

One Million Chessboards: A Single-Process Server Handling Millions of Concurrent Chess Games

2025-07-16
One Million Chessboards: A Single-Process Server Handling Millions of Concurrent Chess Games

The author built "One Million Chessboards," an online multiplayer chess game where a 1000x1000 grid of chessboards forms a single global game. Every move instantly affects the entire board, with no turns and inter-board movement allowed. Running on a single Go process, the game attracted over 150,000 players in 10 days, processing over 15,000,000 moves and hundreds of millions of queries. The article details the game's system design, data distribution, protocol optimizations, optimistic locking, and rollback mechanisms. The author shares lessons learned, including performance optimization, architectural choices, and balancing game scale with player experience. The post concludes with reflections on design flaws, such as the lack of an awe-inspiring scale, and future game development plans.

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Tailscale Subnet Routers: A Simple Solution for Complex Network Connections

2024-12-14
Tailscale Subnet Routers: A Simple Solution for Complex Network Connections

Tailscale typically requires installing a client on every device, but this isn't always feasible for embedded devices or existing VPCs. That's where subnet routers come in. They enable devices to communicate using Tailscale's powerful NAT traversal technology, regardless of whether they're running Tailscale. This article explains how Tailscale subnet routers work, including installation and configuration on Windows and Linux. For large network migrations or connecting AWS VPCs, subnet routers offer a fast and easy way to get started. Personal use is free and doesn't count against device limits.

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You Suck At CSS: A Book Review

2025-03-10

Rex Riepe's 'You Suck At CSS' isn't about avoiding CSS; it's about mastering it efficiently. The book targets both beginners and experts, aiming to help developers quickly complete frontend tasks while emphasizing team efficiency. It supports the California Stylesheets framework and focuses on rapid web development using modern technologies. It provides context on why CSS and its ecosystem are the way they are.

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Development Front-end Development

ROCm Device Support Wishlist: Community Input Sought for Future GPU Compatibility

2025-01-20
ROCm Device Support Wishlist: Community Input Sought for Future GPU Compatibility

The AMD ROCm open-source compute platform is seeking community input to determine which GPUs will receive driver support in the future. Currently, ROCm supports select AMD Instinct and Radeon cards, but many users are requesting support for more models, particularly those with 16GB or more VRAM, and reinstatement of support for older AMD GPUs that have lost ROCm compatibility. A GitHub discussion thread has generated significant community engagement, with users actively voting on their desired GPU support.

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Michigan Considers Sweeping Ban on VPNs and Adult Content

2025-09-18
Michigan Considers Sweeping Ban on VPNs and Adult Content

Michigan Republican representatives have proposed the "Anticorruption of Public Morals Act," aiming to ban a wide range of adult content online, including ASMR, adult manga, AI-generated content, and depictions of transgender individuals. Uniquely, the bill also seeks to prohibit the use of VPNs within the state, charging ISPs with blocking VPN access and imposing hefty fines. This comprehensive legislation threatens the online privacy and security of Michigan residents and could set a precedent for similar laws in other states. The bill's future remains uncertain, but its implications are significant.

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Tech VPN ban

arXivLabs: Experimental Projects with Community Collaborators

2025-03-01
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 embrace arXiv's values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners who adhere to them. Have an idea to enhance the arXiv community? Learn more about arXivLabs.

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Development

Control Your iTerm from LLMs with iterm-mcp

2025-01-30
Control Your iTerm from LLMs with iterm-mcp

iterm-mcp is a Model Context Protocol (MCP) server providing LLM access to your iTerm session. It features efficient token usage by only reading the output the model needs; natural integration allowing LLMs to interact with iTerm, answering questions or performing tasks; and full terminal control with REPL support. Easy to install via npx and integrate with clients like Claude Desktop, it prioritizes simplicity. However, it lacks built-in safety restrictions, requiring users to monitor model activity and exercise caution.

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Development
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