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Undergrad Team Runs Xv6 on a Homebrew CPU

2025-06-28

In 2015, a University of Tokyo undergraduate team tackled an ambitious project: designing, building, and running the Xv6 operating system on a homebrew CPU with a custom RISC ISA. Over four months, they built a C compiler from scratch, overcame numerous challenges in understanding and implementing the necessary CPU features for an OS (interrupts, memory management), and successfully ported Xv6, even adding games like 2048 and Minesweeper. Their final demo ran the required ray-tracing program on top of Xv6, showcasing incredible ingenuity and problem-solving skills. This project serves as a testament to the rewards of reinventing the wheel and the educational value of hands-on learning.

(fuel.edby.coffee)

Development CPU Design

Redis-Powered LLM Acceleration: LMCache Delivers 3-10x Speedup

2025-06-28

Redis-Powered LLM Acceleration: LMCache Delivers 3-10x Speedup

LMCache is an LLM serving engine extension designed to drastically reduce tail latency and boost throughput, particularly in long-context scenarios. By caching reusable text KV pairs across various locations (GPU, CPU DRAM, local disk), LMCache reuses these caches for any reused text (not just prefixes) in any serving instance. This saves valuable GPU cycles and minimizes user response delay. When combined with vLLM, LMCache achieves a 3-10x reduction in latency and GPU cycles across numerous LLM use cases, including multi-round QA and RAG. Try it out with pre-built vLLM Docker images!

(github.com)

AI

How Your Favorite Website Secretly Knows if You're Browsing on Public Transport or in Bed

2025-06-28

How Your Favorite Website Secretly Knows if You're Browsing on Public Transport or in Bed

This article unveils how websites identify bots and real users using various techniques, including checking user agents, IP address reputation, TCP/TLS fingerprinting, JavaScript execution, and behavioral analysis. Websites employ these techniques to combat malicious bots, for example, by analyzing mouse movement patterns, keystroke speed and intervals to determine if a user is a bot. The article also explores headless browsers, CAPTCHAs, and advanced AI-based behavioral analysis, showcasing the ongoing "cat and mouse" game between websites and bots.

(sinja.io)

Tech

A Complete History of Cycling Maps Online

2025-06-28

A Complete History of Cycling Maps Online

A website dedicated to the history of cycling maps has launched, featuring over a hundred carefully restored extracts from major map providers. It's not a blog; instead, it functions as an online 'coffee table' book, offering a curated collection of information for browsing and reference. Content is divided into sections covering an introduction, the development of cycling maps, publishers, sources, dating maps, and a 'Black Museum' showcasing map errors.

(cyclemaps.blogspot.com)

Misc cycling maps website

AI Image Generators Shake Up China's Graphic Design Industry

2025-06-28

AI Image Generators Shake Up China's Graphic Design Industry

AI image generators like DALL-E are significantly impacting China's graphic design landscape. While some designers use AI for cost-effective background creation, it highlights AI's potential to replace parts of the creative process. Clients now expect faster turnaround times and lower prices, leading to increased workload and reduced income for designers. Although AI can quickly replicate styles, it can't replace a designer's core skills in creative strategy and problem-solving. Many view AI as a 'toy' rather than a 'tool', finding its usefulness limited in complex projects. There's hope that AI will become a more effective design assistant in the future.

(www.theverge.com)

Design Creative Industry

US Visa Changes Spark Rise in South Korea's 'Digital Undertaker' Services

2025-06-28

US Visa Changes Spark Rise in South Korea's 'Digital Undertaker' Services

The US Embassy in Seoul has resumed accepting student and exchange visa applications, but with a new requirement: applicants must make all social media accounts public. This has caused anxiety among South Korean students seeking to study in the US, leading many to seek help from 'digital undertaker' services. These services, offered by online reputation management firms, remove potentially damaging posts and photos from social media. The cost ranges from ₩100,000 to millions of won, highlighting the tightening of US visa policies and the impact of social media on personal reputation.

(www.koreaherald.com)

Misc US visa social media scrutiny digital undertakers US Visa Digital Undertaker

Why Senior Developers Are More Crucial Than Ever in the Age of AI Code Generation

2025-06-28

Why Senior Developers Are More Crucial Than Ever in the Age of AI Code Generation

In the era of AI-powered code generation, senior developers are more vital than ever. The article argues that a program is not just code, but a theoretical model built upon a deep understanding of the system. AI-generated code often lacks this theoretical foundation, leading to incoherent codebases and accumulating technical debt. Senior developers build and maintain this theoretical framework, ensuring code aligns with business needs and mentoring junior developers to transform scattered code into coherent programs. Therefore, organizations need to prioritize knowledge sharing and theoretical inheritance to cultivate developers with strong theoretical foundations, ensuring software quality and long-term maintainability.

(cekrem.github.io)

Development senior developers

When the Rule of Law Fails: The Return of Tribalism

2025-06-28

When the Rule of Law Fails: The Return of Tribalism

This article explores the resurgence of tribalism in the Western world as the rule of law weakens. The author argues that when a privileged class rises above the law, older, more brutal tribal rules re-emerge. Tribalism prioritizes power dynamics over morality, aiming for advantage rather than justice. Modern society is presented as a fragile exception, built on a precarious trust in institutions. When the impartiality of these institutions is compromised, tribalism exploits this, using the law itself as a weapon to consolidate power. The author calls for understanding tribalism not to emulate it, but to better protect and preserve the rule of law that underpins modern society.

(sustainableviews.substack.com)

Misc

Real-World Ad Blocker: AR Glasses Filter Out Street Ads

2025-06-28

Real-World Ad Blocker: AR Glasses Filter Out Street Ads

A software engineer has created an augmented reality app for Snap's fifth-generation AR Spectacles that identifies and blocks real-world advertisements, billboards, and product branding. Leveraging Google's Gemini AI, the app detects ads and replaces them with red squares. While still in early stages, it hints at a future where users control the physical content they see, potentially even customizing replacements for blocked ads. Currently, the app is exclusive to Snap Spectacles users.

(www.tomshardware.com)

Tech

The Heritability Gap: Twin Studies vs. Genomics

2025-06-28

The Heritability Gap: Twin Studies vs. Genomics

Since the 1970s, twin studies have suggested high heritability for many behavioral traits, with IQ estimated at around 60% genetic. However, Genome-Wide Association Studies (GWAS) have struggled to find these genes, leading to the "heritability gap." Recent research suggests GWAS predictive power may be inflated due to population stratification, assortative mating, and genetic nurture. New methods like Sib-Regression and RDR offer alternative approaches to estimate heritability, yielding results that differ from twin studies. Debate continues on the true heritability and reasons for discrepancies between methods; some argue twin studies overestimate heritability, while others point to GWAS's neglect of rare variants and gene interactions. Many mysteries remain, demanding further research.

(www.astralcodexten.com)

AI heritability twin studies

Japanese Couple's Three Divorces, Three Marriages: A Tug-of-War Between Law and Love

2025-06-28

Japanese Couple's Three Divorces, Three Marriages: A Tug-of-War Between Law and Love

Yukari Uchiyama and Yukio Koike, a teaching couple from Nagano, Japan, have divorced and remarried three times to circumvent a law requiring spouses to share the same surname. Deeply in love, they've repeatedly separated and reunited, marrying only to register births and then divorcing to maintain their preferred unmarried lifestyle. Their unconventional situation highlights the conflict between Japanese law and individual freedoms.

(www.economist.com)

Misc Japanese law same surname marriage laws

Whitesmiths C Compiler Open Source Initiative: A Legend Returns

2025-06-28

Whitesmiths C Compiler Open Source Initiative: A Legend Returns

The Whitesmiths C compiler, originally released in 1978, supported architectures like DEC PDP-11 and Intel 8080, is poised to become open source! Its creator, P.J. Plauger, has granted permission for non-commercial use. Binaries and some source code for versions including CP/M-80 and an IBM System/36 cross-compiler are now available for download. This historically significant compiler will be a valuable resource for studying the history and development of the C language.

(github.com)

Development

Deleting My Second Brain: A Digital Minimalist's Journey

2025-06-28

Deleting My Second Brain: A Digital Minimalist's Journey

The author spent years building a "second brain" PKM system, only to find it had become a graveyard of information, hindering thought and creativity. He deleted everything, opting for a lighter, experience-focused approach. He realized true knowledge isn't stored in databases but lived and acted upon. This essay explores the pitfalls and reflections of personal knowledge management and the value of returning to authenticity and experience.

(www.joanwestenberg.com)

Misc

Real-World Ad Blocker for Snap Spectacles: Technically Feasible, but Practically Limited

2025-06-28

Real-World Ad Blocker for Snap Spectacles: Technically Feasible, but Practically Limited

A developer built a prototype real-world ad blocker using Snap Spectacles and Google Gemini AI. The prototype utilizes the Depth Module API and cloud vision capabilities to overlay red rectangles on ads. However, due to the semi-transparent nature of AR glasses rendering and their limited field of view, the blocker is currently impractical for completely blocking real-world ads. Nevertheless, this experiment raises interesting questions about the future applications of AR glasses and how we interact with advertising.

(www.uploadvr.com)

Tech

Bare-Metal Nim on Raspberry Pi: A Headless Adventure

2025-06-28

Bare-Metal Nim on Raspberry Pi: A Headless Adventure

This project details a bare-metal environment for Raspberry Pi 1/Zero using the Nim programming language. It features a cooperative scheduler, asynchronous programming model, and direct hardware access without vendor-specific APIs. The project includes memory management, exception handling, and runtime monitoring, along with comprehensive setup instructions. Future plans involve expanding to more target platforms and adding more peripheral drivers.

(github.com)

Development

Generative AI: A Paradigm Shift in Programming

2025-06-28

Large Language Models (LLMs) are revolutionizing software development, a change comparable to the shift from assembly language to high-level programming languages. The author argues that LLMs not only raise the level of abstraction but also introduce non-determinism, fundamentally altering the nature of programming. The evolution from Fortran to Ruby improved efficiency but didn't change the core essence of programming. The non-determinism introduced by LLMs requires programmers to adapt, presenting both challenges and opportunities.

(martinfowler.com)

Development

Multi-Stage Programming with Splice Variables: Safe and Predictable Code Generation

2025-06-28

This paper introduces a novel technique called Multi-Stage Programming (MSP) that allows programs to generate other programs. To ensure safe and predictable code generation, the authors introduce the concept of "splice variables." Splice variables provide fine-grained control over the code generation process and seamlessly scale to advanced features like code pattern matching and rewriting. The type system automatically tracks variable dependencies, ensuring that the generated code is always well-formed, properly scoped, and type-checks correctly. The paper demonstrates the power of splice variables with examples such as generating a power function and showcases features like code pattern matching and rewriting.

(tsung-ju.org)

Development Multi-Stage Programming Splice Variables

Qwen VLo: A Unified Multimodal Model That Understands and Creates Images

2025-06-28

Qwen VLo: A Unified Multimodal Model That Understands and Creates Images

Alibaba DAMO Academy introduces Qwen VLo, a new multimodal model that not only understands image content but also generates high-quality images based on that understanding. Employing a progressive generation method, it builds images gradually from left to right and top to bottom, ensuring a coherent and harmonious final result. Qwen VLo supports multilingual instructions, handles complex tasks like image editing and style transfer, and can even understand the content of its own generated images. While currently in preview, its powerful multimodal capabilities showcase the immense potential of AI in image generation.

(qwenlm.github.io)

AI multimodal model

NLnet Funds 62 Projects to Bolster the Open Internet

2025-06-28

The NLnet Foundation announced 62 new projects funded by its NGI Zero Commons Fund, the largest round yet. These projects span a wide range, from browser-based cellular networking and quantum-safe cryptography to decentralized social media and open-source hardware, all working towards a more open, trustworthy, and resilient internet. Highlights include efforts to develop quantum-resistant cryptography, create a browser-controlled cellular network, and design libre chips with proven Spectre-free designs. This funding round represents a significant investment in building a better, more accessible, and secure digital future.

(nlnet.nl)

Tech digital commons

Android 16's Stingray Defense: A New Layer of Mobile Security

2025-06-28

Android 16's Stingray Defense: A New Layer of Mobile Security

Android 16 introduces a crucial security feature to warn users if their phone connects to a fake or insecure mobile network, often created by a device known as a 'stingray'. This alerts users to unencrypted connections or when the network requests their phone's identifiers, helping detect potential surveillance. However, due to new hardware requirements, this protection will likely be limited to new devices launching with Android 16, such as the upcoming Pixel 10. The feature is implemented through a new 'Mobile Network Security' page in the Safety Center, allowing users to control network notifications and 2G network protection.

(www.androidauthority.com)

Tech

Global Energy Stats: Renewables Surge, But Fossil Fuels Still Dominate

2025-06-28

Global Energy Stats: Renewables Surge, But Fossil Fuels Still Dominate

The 2024 Statistical Review of World Energy reveals a mixed picture. While wind and solar energy expanded by an impressive 16%, global energy demand grew even faster, with fossil fuel use increasing by over 1%. Chinese crude oil demand fell, but Indian coal demand surged. The report highlights that despite rapid renewable growth, it's not enough to offset rising overall demand, leading to another record year for global emissions. This underscores the structural, economic, and geopolitical hurdles to a coordinated global energy transition.

(www.energyinst.org)

Tech

Facebook's Sneaky AI Photo Grab

2025-06-28

Facebook's Sneaky AI Photo Grab

Facebook is testing a new feature that requests access to users' camera rolls to suggest AI-edited photo versions, even those not yet uploaded. This "cloud processing" option allows Facebook to upload photos for analysis, creating collages, recaps, AI stylings, and themes. While Facebook claims these suggestions are only visible to the user and not used for ads, its AI terms allow facial feature and other data analysis. This raises privacy concerns, as Facebook doesn't fully clarify data usage or whether it trains its AI models with this data. Currently testing in the US and Canada, users can disable the feature in settings.

(techcrunch.com)

Tech

Europe's Shift Away From Microsoft: Data Sovereignty Takes Center Stage

2025-06-28

Europe's Shift Away From Microsoft: Data Sovereignty Takes Center Stage

Amidst Microsoft's push to migrate Windows 10 users to Windows 11 and concerns about data security and sovereignty, several European governments and organizations are switching to Linux. The article highlights US government interference with data and the potential influence of political pressure on Microsoft services, driving Europe's pursuit of technological independence. Examples include France's Gendarmerie successfully migrating to Ubuntu Linux and Denmark's plan to abandon Windows and Office. This trend reflects Europe's emphasis on data security and sovereignty, and its concerns about reliance on American tech companies.

(www.theregister.com)

Tech De-Microsoft

Photonic Processor Achieves Breakthrough in AI Acceleration

2025-06-28

Photonic Processor Achieves Breakthrough in AI Acceleration

Lightmatter's groundbreaking research, published in Nature, unveils a revolutionary photonic processor capable of running state-of-the-art AI models like ResNet and BERT with accuracy comparable to traditional 32-bit floating-point systems. Integrating six chips in a single package, this processor delivers 65.5 trillion ABFP operations per second while consuming only 78 watts of electrical power and 1.6 watts of optical power. This breakthrough represents a significant step towards post-transistor computing, offering a viable solution to the exponentially increasing costs of AI computation.

(lightmatter.co)

Tech

Turning Urine into Bone: A Biotech Breakthrough

2025-06-28

Turning Urine into Bone: A Biotech Breakthrough

Researchers from Lawrence Berkeley National Laboratory, UC Irvine, and UIUC have engineered yeast to convert human urine into hydroxyapatite, a valuable mineral used in bone and tooth repair. This cost-effective process not only provides a sustainable source of hydroxyapatite but also offers a solution for reducing wastewater treatment costs and creating fertilizer. The modified yeast, dubbed 'osteoyeast', efficiently extracts minerals from urine, mimicking the natural bone-building process. This 'pee-cycling' approach promises a significant environmental and economic impact.

(newscenter.lbl.gov)

Tech

arXivLabs: Experimental Projects with Community Collaborators

2025-06-28

arXivLabs is a framework enabling collaborators to develop and share new arXiv features directly on our website. 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 adhere to them. Have an idea for a project that will benefit arXiv's community? Learn more about arXivLabs.

(arxiv.org)

Development

A Concise Rust Kernel Driver: The AX88796B Ethernet Controller Example

2025-06-28

This article details the experience of writing a Linux kernel driver for the AX88796B embedded Ethernet controller using Rust. The author contrasts the Rust version with its C counterpart, highlighting differences in syntax, types, and APIs. The Rust version is remarkably concise, at just over 100 lines, leveraging macros to simplify driver registration and using traits and the `#[vtable]` macro for seamless integration with existing C code. The article clearly explains the advantages of Rust in kernel driver development, such as memory safety guarantees through references and simplified error handling using `Result` and the `try` operator, providing valuable insights for Rust kernel driver development.

(lwn.net)

Development Kernel Driver

Secret Ultrasound Communication: Sending Data with Your Phone's Mic and Speaker

2025-06-28

This article details a fun method for transmitting data using ultrasound. The author cleverly encodes data into an ultrasonic signal, enabling short-range communication between devices using a phone's microphone and speaker. While the method has limitations like poor interference resistance and slow speed, it demonstrates the possibility of unconventional communication using everyday devices and sparks thought about its potential in practical applications, such as assisting meeting software in identifying nearby devices.

(halcy.de)

Tech ultrasound communication

Spark: AI-Powered Renewable Energy Infrastructure

2025-06-28

Spark: AI-Powered Renewable Energy Infrastructure

Spark is building the AI engine powering the next generation of renewable energy infrastructure. Their mission is to help renewable energy developers build solar farms, battery storage, and related projects more efficiently. They're already working with industry leaders like Colliers Engineering & Design and Standard Solar, and are backed by top-tier investors including AI Grant and Y Combinator. They're hiring software engineers with 3+ years of experience, full-stack skills, and a passion for AI and clean energy.

(www.ycombinator.com)

Tech

Dubai's Hustle: An Indian Founder's Year of Lessons

2025-06-28

Dubai's Hustle: An Indian Founder's Year of Lessons

A year in Dubai has taught an Indian entrepreneur that the city's business landscape is vastly different from India's. Success hinges on relationship-building, understanding the intricate web of stakeholders, and aligning with local priorities. The author details the challenges of navigating a culture focused on prestige and long-term relationships, emphasizing patience, networking, and exceeding global standards. The article offers valuable insights for Indian founders and investors looking to expand into Dubai, highlighting the need to adapt and elevate their approach beyond a transactional mindset.

(www.dealflowiq.com)

Startup Dubai Business

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