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Demystifying Markov Chain Monte Carlo: A Simple Explanation

2025-04-16

This post provides a clear and accessible explanation of Markov Chain Monte Carlo (MCMC), a powerful technique for sampling from complex probability distributions. Using an analogy of estimating probabilities of baby names, the author illustrates the core problem MCMC solves. The explanation cleverly relates MCMC to a random walk on a graph, leveraging the stationary distribution theorem to show how to construct a Markov chain whose stationary distribution matches the target distribution. The Metropolis-Hastings algorithm, a common MCMC method, is introduced and its effectiveness is demonstrated.

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(www.jeremykun.com)
AI Markov Chain Monte Carlo Probability Distribution Sampling Metropolis-Hastings Algorithm

Reverse Engineering the Xbox 360 RGH Exploit: A Thrilling Journey into Hardware Hacking

2024-12-19
Reverse Engineering the Xbox 360 RGH Exploit: A Thrilling Journey into Hardware Hacking

The author meticulously documents their journey of reverse engineering the Xbox 360 RGH (Reset Glitch Hack) exploit. By using a hardware 'glitching' technique, they precisely control nanosecond pulses on the CPU reset line to trick the system's signature verification, enabling the execution of unsigned code. The author overcomes challenges like precise timing, successfully recreating this classic exploit. They share their tools (FPGA/CPLD, logic analyzer), Verilog code, and experiences, offering valuable insights for hardware security researchers.

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(github.com)
Hardware RGH exploit

The Enduring Power of Design: From Antiquity to Modernity

2025-04-12
The Enduring Power of Design: From Antiquity to Modernity

This article explores the concept of 'form follows function' in architectural design and the enduring spirit manifested in different eras. Masters of architecture such as Le Corbusier and Louis Sullivan argued that classic structures like the Parthenon, Gothic cathedrals, and modern skyscrapers, telephones, airplanes, and automobiles all embody a design spirit that combines 'imagination and reason'. Underlying these designs, despite technological advancements, is the same eternal principle.

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(publicdomainreview.org)
Design Form Follows Function Enduring Principles

A 12-bit Rainbow Palette for National Grid: Live

2025-04-28

This article details a 12-bit rainbow palette designed for National Grid: Live. The palette consists of twelve colors carefully chosen considering human perception of luminance, chroma, and hue. Using a 12-bit color depth, each color requires only four hexadecimal characters, making it efficient for use in CSS or SVG. The design addresses the limitations of standard RGB palettes by leveraging the LCH color space, resulting in a visually pleasing and smoothly transitioning rainbow spectrum. This palette offers both efficiency and aesthetic appeal.

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(iamkate.com)
Design color design palette

Internet Archive Joins Federal Depository Library Program Amidst Copyright Battles

2025-07-26
Internet Archive Joins Federal Depository Library Program Amidst Copyright Battles

The Internet Archive (IA) has joined the Federal Depository Library Program to streamline access and digitization of government publications. However, IA faces ongoing copyright lawsuits over its Open Library and Great 78 Project, with potential damages threatening its existence. Supporters hail IA as a crucial digital library, while publishers view it as an unlicensed copyrighting and distribution business. Joining the program doesn't alter IA's practices, as government publications are not copyrighted.

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(www.kqed.org)
Tech Copyright Lawsuits Digital Library

Retro Handheld Battery Life: The Evercade's 4-Hour Runtime Sparks a Debate

2025-05-28
Retro Handheld Battery Life: The Evercade's 4-Hour Runtime Sparks a Debate

While reviewing the Evercade handheld console, the author discovered its meager four-hour battery life, a stark contrast to the original Game Boy's impressive 20-hour runtime. The article analyzes the battery life of various Nintendo handhelds throughout the years, highlighting the decline in battery life despite significant performance improvements in modern devices. The author explores factors like operating systems and processors, using examples like the Nokia 3310 to illustrate the difference in battery longevity across eras. Ultimately, the author questions whether high performance justifies sacrificing battery life.

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(brainbaking.com)
Hardware handheld battery life hardware performance

Owl: Spaced Repetition for Enhanced Memory and Creativity

2025-04-06

Owl leverages the science of spaced repetition to boost memory retention and creativity. Create your own flashcards or utilize our expanding library of public decks. Learn anything, anytime, anywhere—for free! Owl is used across various industries to improve recall, accelerate learning, and generate more ideas. Built for our own needs, we're now sharing it with you. Happy learning!

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(owl.cards)
Development memory learning flashcards

Meta's Glean: Open-Source Code Indexing at Scale

2025-01-01
Meta's Glean: Open-Source Code Indexing at Scale

Meta has open-sourced Glean, a powerful code indexing system designed for efficiency and scalability. Glean collects and processes information from source code, providing it to developer tools via a flexible query language called Angle. Its innovative incremental indexing tackles the challenges of massive codebases, enabling features like code navigation, search, and documentation generation. Glean's versatility supports diverse languages and custom data schemas, making it a valuable asset for developers.

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(engineering.fb.com)
Development code indexing

Emulating a Ukrainian Retro Computer: Bringing Childhood Games Back to Life

2025-09-22

The author revisited their childhood memories of the Fahivets-85 computer from Ukraine and decided to emulate it. They built a WebAssembly-based emulator that currently runs a simple game called "Rain". The development involved implementing the CPU instruction set, simulating the IO controller, keyboard, and display. AI assistance was used to generate code, and the emulator's functionality was gradually refined until the game successfully ran. While some issues remain, this is an impressive accomplishment.

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(rmazur.io)
Development

VS Naipaul's Brutal, Yet Illuminating, Critique of My First Novel

2025-05-05
VS Naipaul's Brutal, Yet Illuminating, Critique of My First Novel

This piece recounts the author's intense and complicated relationship with Nobel laureate V.S. Naipaul regarding his debut novel. Naipaul delivers a scathing critique, pointing out flaws in the narrative structure and offering suggestions for improvement. Despite the harsh criticism, Naipaul also affirms the author's talent and provides invaluable writing advice. The experience, both painful and enlightening, ultimately teaches the author valuable lessons about writing and reveals the deeper meaning behind Naipaul's rigorous approach.

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(granta.com)
Misc

Unifying Deep Learning Operations: The Generalized Windowed Operation

2025-09-13

This paper introduces the Generalized Windowed Operation (GWO), a theoretical framework unifying deep learning's core operations like matrix multiplication and convolution. GWO decomposes these operations into three orthogonal components: Path (operational locality), Shape (geometric structure and symmetry), and Weight (feature importance). The paper proposes the Principle of Structural Alignment, suggesting optimal generalization occurs when GWO's configuration mirrors the data's intrinsic structure. This principle stems from the Information Bottleneck (IB) principle. An Operational Complexity metric based on Kolmogorov complexity is defined, arguing that the nature of this complexity—adaptive regularization versus brute-force capacity—determines generalization. GWO predicts superior generalization for operations adaptively aligning with data structure. The framework provides a grammar for creating neural operations and a principled path from data properties to generalizable architectures.

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(zenodo.org)
AI

Cuban's Offer: Laid-off Gov't Tech Workers Start Their Own Consulting Firm

2025-03-02
Cuban's Offer: Laid-off Gov't Tech Workers Start Their Own Consulting Firm

Billionaire Mark Cuban offered support to the roughly 70 employees laid off from the government's 18F tech unit, urging them to form a consulting company. The layoffs, orchestrated by Elon Musk's Department of Government Efficiency (DOGE), have sparked controversy. Cuban believes their expertise will be crucial for DOGE in fixing inevitable problems, offering investment and help. This unexpected opportunity allows the laid-off workers to leverage their skills, potentially reshaping civic tech on their own terms and creating a fascinating twist in the administration's efforts to downsize the federal workforce.

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(techcrunch.com)
Tech

The Two Child Problem: Intuition vs. Reality in Probability

2025-08-28
The Two Child Problem: Intuition vs. Reality in Probability

A family has two children, and at least one is a girl. What's the probability both are girls? Intuition might suggest 1/2, but the correct answer is 1/3. This article uses probability trees and sample space to explain the counter-intuitive solution, highlighting the pitfalls of relying on intuition and neglecting problem details. It advocates for computer simulation to verify probability results, emphasizing the importance of precise problem definition, stating assumptions clearly, and avoiding reliance on 'common sense'.

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(blog.engora.com)
Misc conditional probability paradox

Amazon's Secret Vega TV OS is Coming Soon

2025-04-18
Amazon's Secret Vega TV OS is Coming Soon

Amazon is secretly pushing forward with its new Vega TV operating system, planning to release its first non-Android streaming device this year. Vega, a Linux-based OS, may eventually replace Amazon's Fire OS. Despite previous delays to a Vega streaming stick and an update to its Android-based TV OS, leaks and sources confirm that the Vega project is progressing, with the first device imminent.

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(www.lowpass.cc)
Tech Vega OS Streaming Device

Pushing the Limits: Hand-written ARM Cortex-A53 NEON Assembly Kernel

2025-04-21

This post delves into optimizing NEON assembly kernels for the ARM Cortex-A53. Using y[n] = ax[n] + b as an example, the author meticulously explains how to leverage the Cortex-A53's instruction timing characteristics (partial dual-issue capabilities and in-order execution) to overcome the limitations of the 64-bit load data path. Techniques like instruction pipelining and prefetching are employed to maximize performance. The hand-written assembly kernel significantly outperforms LLVM-generated code, highlighting the potential of manual optimization when robust CPU models are lacking.

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(destevez.net)
Development Assembly Optimization

WhoFi: Wi-Fi-Based Biometric Identification Achieves 95.5% Accuracy

2025-07-23
WhoFi: Wi-Fi-Based Biometric Identification Achieves 95.5% Accuracy

Researchers from La Sapienza University of Rome have developed WhoFi, a novel biometric identification system using Wi-Fi signals. By analyzing patterns in Wi-Fi Channel State Information (CSI), WhoFi can accurately re-identify individuals across different locations, unaffected by lighting conditions and able to penetrate obstacles. Achieving up to 95.5% accuracy on the NTU-Fi dataset, WhoFi demonstrates the potential of Wi-Fi signals as a robust and privacy-preserving biometric modality, though privacy concerns remain.

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(www.theregister.com)
AI Biometrics

ChemBench: A Benchmark for LLMs in Chemistry

2025-06-16
ChemBench: A Benchmark for LLMs in Chemistry

ChemBench is a new benchmark dataset designed to evaluate the performance of large language models (LLMs) in chemistry. It features a diverse range of chemistry questions spanning various subfields, categorized by difficulty. Results show leading LLMs outperforming human experts overall, but limitations remain in knowledge-intensive questions and chemical reasoning. ChemBench aims to advance chemical LLMs and provide tools for more robust model evaluation.

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(www.nature.com)
AI Chemistry

Build Your Own Muon Detector for Under $100

2025-02-27
Build Your Own Muon Detector for Under $100

Inspired by Nobel laureate Luis Alvarez's muon-based pyramid exploration, the author built a muon detector for around $100. Using two Geiger counters and an Arduino Nano, the device cleverly distinguishes cosmic-ray muons from lower-energy particles through a coincidence method. Experiments verified its ability to detect muon flux variations with angle and successfully measured rock thickness changes deep within a gold mine, even sensing a vertical shaft. This demonstrates the feasibility of exploring Earth's inner structure with simple equipment.

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(spectrum.ieee.org)
Tech Muon Detection Cosmic Rays DIY Science

Lightweight DataFrame in MicroHs: A Haskell 2010 Adventure

2025-09-11

Starting with a Frege (JVM Haskell) Android project in 2015, the author's functional programming journey led to a quest to decouple their DataFrame library from GHC for MicroHs compatibility. This post details implementing core DataFrame functionality – construction, basic expressions, `filterWhere`, `derive`, and Markdown rendering – in Haskell 2010, without GADTs, type families, or reflection. The experiment demonstrates that while verbose, the core functionality remains viable, offering portability between MicroHs (for tiny CLIs or embedded contexts) and GHC (for speed and ecosystem access). MicroHs binaries are roughly 100x smaller but 5-10x slower; a worthwhile trade-off for many data-wrangling tasks, allowing a GHC backend for heavy lifting.

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(mchav.github.io)
Development

Newark Airport Suffers Second Radar Outage in Weeks, Causing Widespread Delays

2025-05-09
Newark Airport Suffers Second Radar Outage in Weeks, Causing Widespread Delays

Just days after a brief outage crippled radar and communications at Newark Liberty International Airport, a similar incident occurred on Friday morning. A telecommunications outage lasting 90 seconds impacted communications and radar displays at the Philadelphia TRACON, affecting Newark's airspace. The FAA attributes the issue to a July 2022 change consolidating radar and radio communication to a single data feed from New York. The agency plans to replace the copper connection with fiber, add high-bandwidth connections, and hire more controllers. A new backup system is also being deployed. Hundreds of flights were delayed, highlighting the airport's aging control system and staffing shortages. The stress of repeated outages led some controllers to take leave.

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(www.theverge.com)
Tech flight delays

Breakthrough Si-based Anode Material: Sieving-Pore Structure Enables High-Performance Lithium-Ion Batteries

2025-05-30
Breakthrough Si-based Anode Material: Sieving-Pore Structure Enables High-Performance Lithium-Ion Batteries

Researchers have developed a novel silicon-carbon composite anode material (SSC) using a two-step chemical vapor deposition method. The SSC material features a unique sieving-pore structure with sub-nanometer pore entrances that effectively sieve the electrolyte, suppressing the formation of organic-rich SEI and promoting the formation of inorganic-rich SEI. This inorganic-rich SEI not only stabilizes the interface but also provides fast Li+ transport pathways. Simultaneously, the combined effect of the sieving-pore structure and inorganic-rich SEI mechanically confines the volume expansion of Si, inhibiting the formation of c-Li15Si4 and enhancing cycling stability. Experimental results demonstrate that the SSC anode exhibits high reversible capacity, excellent cycling life, and rate capability, showing great potential for high-energy density lithium-ion batteries.

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(www.nature.com)
Tech lithium-ion battery silicon anode sieving-pore structure

The Unsung Heroes Keeping Africa (and the World) Online

2025-09-20
The Unsung Heroes Keeping Africa (and the World) Online

Rest of World profiles the Léon Thévenin, Africa's only permanently stationed undersea cable repair ship. The article highlights the grueling work of its crew, like cable jointer Shuru Arendse, who maintain Africa's internet connectivity. Their demanding jobs, often requiring months away from family, are crucial to global data flow, especially with the rise of AI which relies heavily on high-speed connectivity. The piece details the intricate cable repair process, team dynamics, and the dedication of these individuals in safeguarding global internet access.

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(restofworld.org)
Tech Internet Infrastructure

AI Coding Tools: A Growing Divide Between Leadership and Developers

2025-04-09
AI Coding Tools: A Growing Divide Between Leadership and Developers

A recent survey reveals a rift between C-suite executives and employees regarding the adoption of AI coding tools. While 75% of leaders deem their AI rollout successful, only 45% of employees agree. Developers worry about AI tools introducing errors, inefficiency, and increasing technical debt. Leadership's misguided mandates hinder successful adoption. Although AI tools can boost efficiency, high error rates and poor performance on complex tasks remain. Empowering developers to choose and use tools autonomously, rather than enforcing mandates, is key. ChargeLab's approach of empowering its engineers led to a 40% productivity increase, highlighting the importance of trust and flexibility.

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(leaddev.com)
Development AI coding tools

Conway's Law and the Unexpected Power of Weak Ties

2025-08-28
Conway's Law and the Unexpected Power of Weak Ties

This article explores the unexpected implications of Conway's Law in team organization and project collaboration. The author argues that formal service line architectures often fail to reflect the reality of team collaboration. Many projects are driven by informal, cross-team 'weak ties', sparked by casual conversations, leading to unexpected projects and innovations. These weak ties, as described by Granovetter's 'strength of weak ties' theory, connect different teams and knowledge domains, sparking new ideas, highlighting inefficiencies, and uncovering opportunities hidden within silos. The author contrasts Slack and Microsoft Teams in their ability to foster weak ties, emphasizing the importance of choosing the right collaboration tools, as they shape team communication patterns and ultimately, product design.

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(frederickvanbrabant.com)
Development Weak Ties

Say Goodbye to Expensive Geocoding APIs: A Lightweight JavaScript Library for State/Province Lookup

2025-06-04
Say Goodbye to Expensive Geocoding APIs: A Lightweight JavaScript Library for State/Province Lookup

A startup spent thousands annually on the Google Maps API for reverse geocoding, just to determine users' states. Finding this wasteful, the author built `coord2state`, a lightweight JavaScript library that directly identifies US states from latitude/longitude coordinates. Leveraging US Census Bureau border data and the Douglas-Peucker algorithm for simplification, it achieves 99.9% accuracy at a 0.01° tolerance, weighing in at only 260KB. The library is open-sourced on GitHub and NPM, offering a cost-effective alternative for developers.

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(austinhenley.com)
Development javascript library reverse geocoding

DIY Glow-in-the-Dark Strontium Aluminate: A Homemade Chemistry Challenge

2025-01-19

A blogger attempted to synthesize glow-in-the-dark strontium aluminate (SrAl2O4) at home, a material known for its persistent luminescence. The synthesis involved multiple steps, including the preparation of aluminum nitrate, mixing oxide precursors, and high-temperature calcination. However, due to a lack of appropriate equipment and high-purity reagents, the blogger only achieved short-lived luminescence, falling short of the persistent glow seen in commercial products. This post meticulously details the entire experimental process, including chemical equations, procedures, and challenges encountered, serving as a valuable resource for chemistry enthusiasts.

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(maurycyz.com)
Misc chemical synthesis glow-in-the-dark material strontium aluminate

arXivLabs: Experimenting with Community Collaboration

2025-08-20
arXivLabs: Experimenting with Community Collaboration

arXivLabs is a framework for collaborators to develop and share new arXiv features directly on the site. Individuals and organizations working with arXivLabs embrace our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only partners with those who share them. Got an idea for a project that will benefit the arXiv community? Learn more about arXivLabs.

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(arxiv.org)
Development

Microsoft Favors Anthropic AI Models, Prioritizing Claude Sonnet 4 for GitHub Copilot

2025-09-16
Microsoft Favors Anthropic AI Models, Prioritizing Claude Sonnet 4 for GitHub Copilot

Microsoft is adding automatic AI model selection to Visual Studio Code, prioritizing optimal performance. GitHub Copilot free users will see automatic selection between models like Claude Sonnet 4, GPT-5, and GPT-5 mini, while paid users will primarily use Claude Sonnet 4. Internal documents reveal Microsoft is instructing developers to favor Claude Sonnet 4 and is making significant investments in its own AI model cluster. Furthermore, parts of Microsoft 365 Copilot will leverage Anthropic models. Despite a new deal with OpenAI, Microsoft's preference for Anthropic's AI signals a shift in its AI strategy.

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(www.theverge.com)
Development

AROS OS 2024: A Year of Significant Progress Towards 64-bit

2025-01-02
AROS OS 2024: A Year of Significant Progress Towards 64-bit

2024 was a banner year for the AROS operating system. The core Deadwood system saw major updates to both its 32-bit and 64-bit branches, including a 64-bit emulator for 32-bit compatibility. Major distributions like AROS One and Tiny AROS received updates, boasting improved software and game support. Hardware recommendations expanded, welcoming the A600GS. Software highlights included the updated Odyssey browser with a newer WebKit engine, a new Final Writer release, and ports of classic games such as Wipeout Rewrite and Doom 3. Overall, AROS made significant strides in 2024, setting the stage for a 64-bit future.

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(arosnews.github.io)
Development 64-bit
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