Earth's 60-Year-Old Secret Companion: A New Quasi-Moon Discovered

2025-09-22
Earth's 60-Year-Old Secret Companion: A New Quasi-Moon Discovered

Astronomers have discovered a near-Earth asteroid named 2025 PN7, a quasi-moon that has been orbiting Earth unnoticed for about 60 years. This roughly 30-meter-diameter space rock is smaller than any previously known quasi-moon and its orbit shifts between a near-Earth orbit and a horseshoe orbit. Researchers hypothesize it may originate from the Arjuna asteroid belt, or even be a fragment of the Moon. While in close proximity to Earth, it poses no threat and offers valuable opportunities for solar system research and testing planetary exploration technologies.

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Hubble Confirms First Lone Black Hole

2025-04-21
Hubble Confirms First Lone Black Hole

A team of astronomers, using data from the Hubble Space Telescope and Gaia spacecraft, has confirmed the existence of the first isolated stellar-mass black hole. Initially spotted in 2022, this approximately seven-solar-mass black hole was detected through its gravitational microlensing effect. Unlike previously discovered black holes which all had companion stars, this discovery offers a new window into these mysterious objects and paves the way for future searches using the Nancy Grace Roman Space Telescope.

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Tech

arXivLabs: Experimental Projects with Community Collaborators

2025-02-03
arXivLabs: Experimental Projects with Community Collaborators

arXivLabs is a framework enabling collaborators to develop and share new arXiv features directly on the arXiv website. Individuals and organizations involved with arXivLabs embrace our 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 for a project that will benefit the arXiv community? Learn more about arXivLabs.

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Development

RFK Jr.'s Plan to Make America Healthy: An Apple Watch for Everyone?

2025-06-25
RFK Jr.'s Plan to Make America Healthy: An Apple Watch for Everyone?

Health and Human Services Secretary Robert F. Kennedy Jr. has launched an ambitious initiative to improve Americans' health by promoting widespread wearable device adoption, aiming for every American to wear one within four years. While proponents highlight the potential for early disease detection, concerns remain about privacy and data security risks associated with mass adoption. This, coupled with RFK Jr.'s history of spreading vaccine misinformation and recent controversial changes to the vaccine advisory panel, raises significant doubts about the plan's reliability and efficacy.

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Tech

arXivLabs: Community Collaboration on Experimental Projects

2025-09-23
arXivLabs: Community Collaboration on Experimental Projects

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 share them. Got an idea for a project that benefits the arXiv community? Learn more about arXivLabs.

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Development

Ubuntu 25.10 Drops Xorg Support for GNOME, Embraces Wayland Exclusively

2025-06-10
Ubuntu 25.10 Drops Xorg Support for GNOME, Embraces Wayland Exclusively

Ubuntu 25.10, codenamed "Questing Quokka," is making a significant change: the default GNOME desktop will exclusively use Wayland, dropping support for Xorg. This isn't a sudden decision; GNOME is phasing out Xorg support, and Canonical is proactively adapting. This allows users and developers a full release cycle to adjust before the next LTS, Ubuntu 26.04, arrives next year. The move is driven by Wayland's maturity, improved Nvidia driver support, better touchscreen and high-DPI display handling, and a simplification of development by avoiding maintaining two display servers. While some users rely on Xorg, it won't disappear entirely; it can still be installed and used with other desktop environments. Most X11 applications will continue to function via XWayland.

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Development

North American Ski Resorts Face Existential Threat: Climate Change and Environmental Regulations

2025-01-31
North American Ski Resorts Face Existential Threat: Climate Change and Environmental Regulations

The North American ski industry is facing a crisis. Since the boom of the 1960s and 70s, over half of all ski resorts have closed, driven by climate change, environmental regulations, and shifting consumer demands. The study highlights the unsustainable water and energy consumption of artificial snowmaking, along with negative impacts on vegetation and wildlife. To survive, resorts must adopt sustainable practices, including investing in eco-friendly technologies, diversifying their offerings, implementing multi-resort passes, and exploring innovative ownership models to adapt to the changing climate and environmental pressures while maintaining profitability.

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Tracing Firefox Memory Allocation with eBPF

2025-05-31

The author used eBPF (extended Berkeley Packet Filter) to trace memory allocation in SpiderMonkey, Firefox's JavaScript engine. The initial goal was to pinpoint the source locations of frequent Rooted object creations for memory management optimization. Using the bpftrace tool and user probes (uprobes), the author successfully traced the `registerWithRootLists` function and utilized the ustack function to get call stack information. Ultimately, the author generated reports and filed several bug reports, optimizing memory allocation and reducing tens of millions of calls to `registerWithRootLists`.

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Development

Qwen3: A Multi-Lingual LLM with Switchable Thinking Modes

2025-04-28
Qwen3: A Multi-Lingual LLM with Switchable Thinking Modes

Alibaba DAMO Academy released Qwen3, its latest large language model, offering various model sizes with open-sourced weights. Qwen3 features switchable "thinking" and "non-thinking" modes, letting users control reasoning depth and speed based on task complexity. It supports 119 languages and dialects. Enhanced coding and agentic capabilities are also included, along with diverse deployment and development tools.

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AI

US Research Funding Freeze: Innovation Engine Stalls

2025-05-12
US Research Funding Freeze: Innovation Engine Stalls

The US National Science Foundation (NSF) froze all outgoing funding, abruptly canceling over 1,000 research projects and halting roughly $739 million in research funds. This has caused widespread chaos in academia, forcing labs to shut down, jeopardizing graduate students' degrees, and leaving early-career faculty without grants. The article argues that this threatens the future of the US tech industry, as many tech giants' technologies originated from publicly funded university research. It calls for tech companies to reciprocate and collectively protect the research ecosystem to prevent a talent shortage.

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Property-Based Testing: Why it Trumps Unit Testing for Complex Inputs

2025-05-21
Property-Based Testing: Why it Trumps Unit Testing for Complex Inputs

This article debates the merits of property-based testing (PBT) versus traditional unit testing. The author argues that while unit tests suffice for functions with single inputs, the combinatorial explosion of edge cases in multi-input functions makes PBT, with its randomized input generation, superior at uncovering hidden boundary errors. However, PBT has a learning curve; mastering complex input generation strategies is crucial. Most PBT examples are too simplistic to showcase its true power in handling complex input spaces.

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Nyxt: The Emacs-Inspired Browser for Developers

2025-08-14

Nyxt is an unconventional web browser built on the philosophy of Emacs: highly customizable and keyboard-driven. Written in Common Lisp and licensed under the BSD 3-clause license, it prioritizes Linux users and empowers developers to extend its functionality. While inspired by Emacs, Nyxt runs independently and supports vi and CUA keybindings. The current 3.x series uses WebKitGTK, while the upcoming 4.0 will leverage Electron for improved performance and cross-platform support (macOS and Windows). Nyxt's minimalist interface and extensive customization options appeal to developers seeking ultimate efficiency, but its steep learning curve and limited community resources present a challenge.

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Development

Zero-Downtime Database Migration Verified with PlusCal

2025-03-11

This blog post details how the author used PlusCal, a DSL for TLA+, and formal verification to ensure the correctness of a zero-downtime database migration. A PlusCal model was built simulating user Upsert, Delete, and Get operations on a database, along with a background migration process. By simulating a system without migration and one with migration, and verifying the consistency of Get operation results across all states, the author ensured the correctness of the migration algorithm. Formal verification helped in early detection of flaws, such as improper handling of TOMBSTONES, and highlighted the importance of atomic operations, like the atomicity of checking and inserting data during migration.

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Development

Openlayer: Hiring Backend Engineer to Tackle AI Reliability

2025-02-28
Openlayer: Hiring Backend Engineer to Tackle AI Reliability

Openlayer, a startup tackling the AI reliability problem, is hiring a seasoned backend engineer. The role involves maintaining and expanding their core API, working with large datasets, improving user-facing developer tools, and contributing to security, new features, bug fixes, and product ideation. Ideal candidates will have 5+ years of backend or full-stack experience, proficiency in Python and another language, and a passion for building scalable data engines. Openlayer offers competitive salary, equity, health benefits, and a flexible work environment.

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Penny-1.7B: A 19th-Century Irish Prose Style Language Model

2025-06-02
Penny-1.7B: A 19th-Century Irish Prose Style Language Model

Penny-1.7B is a 1.7 billion parameter causal language model fine-tuned with Group Relative Policy Optimization (GRPO) to mimic the 19th-century prose style of the 1840 Irish Penny Journal. A reward model distinguishes original journal text from modern translations, maximizing authenticity. Ideal for creative writing, educational content, or stylistic pastiche in Victorian-era Irish English, but not recommended for contemporary fact-checking.

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AI

Chip-8 Emulator Intro: Building a Retro Game Console in Code

2025-01-06

This article introduces Chip-8, a simple virtual game console system, and explains how to build its emulator. It clearly explains binary, hexadecimal, and how Chip-8 instructions work, providing the foundational knowledge for building an emulator. The author guides the reader step-by-step, from simple to more complex instructions, explaining the inner workings of Chip-8, making it a great resource for those interested in retro gaming consoles and emulator technology.

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Development

Data Visualization: Beyond Illustration, Towards Elucidation

2025-02-07
Data Visualization: Beyond Illustration, Towards Elucidation

This article praises innovative approaches to visualizing mathematical formulas. Using Daniel Fleisch's book on Maxwell's equations as an example, it argues that formulas in traditional academic papers are often opaque, while good visualizations clarify complex information, achieving 'elucidation' rather than mere 'illustration'. This aligns with Edward Tufte's concept of 'visual explanation', advocating for the power of data visualization to make complex information easily understandable.

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CVE Program Faces Funding Cliff, Threatening Global Cybersecurity

2025-04-16
CVE Program Faces Funding Cliff, Threatening Global Cybersecurity

MITRE's CVE (Common Vulnerabilities and Exposures) program, a cornerstone of global cybersecurity, faces a potential shutdown due to expiring funding from the U.S. Department of Homeland Security. The program assigns standardized identifiers to software vulnerabilities, crucial for communication and coordinated responses. A lapse would severely disrupt vulnerability tracking, patch management, and threat intelligence, impacting governments, businesses, and individuals. While historical CVE data will remain on GitHub, the cessation of new vulnerability assignment would cripple the global cybersecurity community's ability to respond to emerging threats. Experts urge immediate government intervention to prevent catastrophic consequences and advocate for stable, long-term funding to ensure the CVE program's continued operation.

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Tech

Unprecedented Solar Storm Creates Mystery Radiation Belts Around Earth

2025-02-07
Unprecedented Solar Storm Creates Mystery Radiation Belts Around Earth

A massive solar storm in May 2024 impacted Earth profoundly, its effects reaching even the ocean floor. Beyond stunning auroras, the storm created two temporary radiation belts within Earth's magnetic field. Remarkably, one belt contained high-energy protons—a never-before-seen phenomenon. These belts persisted for three months, far longer than typical storm-induced belts. While subsequent storms largely dispersed the particles, some remain, posing a potential hazard to satellites. Further research is crucial to understand the long-term effects and risks.

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US Power Outages: A Tale of Extreme Events and Regional Disparities

2025-04-15
US Power Outages: A Tale of Extreme Events and Regional Disparities

While US electricity service boasts high reliability, large-scale outages caused by extreme weather events (hurricanes, wildfires, winter storms) are becoming more frequent, disproportionately impacting specific regions. Analysis reveals that a small number of extreme events account for the majority of outage minutes, with a strong regional component. While nationwide average outage minutes remain relatively stable, baseline reliability varies drastically across regions, with rural areas significantly lagging behind urban centers. Outages peak during summer and winter months.

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Whistleblower Alleges DOGE Team Exfiltrated Sensitive Labor Data

2025-04-15
Whistleblower Alleges DOGE Team Exfiltrated Sensitive Labor Data

A whistleblower has revealed details of how the DOGE team may have accessed and exfiltrated sensitive labor data from the National Labor Relations Board (NLRB). The whistleblower alleges that after gaining access to NLRB systems, the DOGE team obtained substantial data, including union information, ongoing legal cases, and corporate secrets. They allegedly attempted to cover their tracks by disabling monitoring tools and manually deleting access records. Evidence presented includes a large data exfiltration event, suspicious login attempts from a Russian IP address, and a project named "NxGenBdoorExtract," potentially designed to extract data from the NLRB's internal system. This incident raises serious concerns about data security and privacy, with experts warning of potential harm to unions, employees, and businesses.

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/etc/glob: The Untold Story of Early Unix Shell Globbing

2025-01-13

This article delves into the history and function of `/etc/glob` in early Unix systems. Before the V7 Bourne Shell, Unix shell globbing wasn't handled by the shell itself but delegated to the external program `/etc/glob`. `/etc/glob` received the command and arguments, expanded wildcards, and then executed the command. The article details how `/etc/glob` worked across different Unix versions, including handling escaped characters and the rationale behind using an external program—likely due to resource constraints in early systems.

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Development Unix history Globbing

MLB Tests Automated Ball-Strike System: Robot Umpires on the Horizon?

2025-02-23
MLB Tests Automated Ball-Strike System: Robot Umpires on the Horizon?

Major League Baseball (MLB) is testing an Automated Ball-Strike System (ABS) during spring training exhibition games after four years of minor league trials. The system uses cameras to track pitches and determine if they're in the strike zone, relaying the call to the umpire via earbud, who then signals to players and fans. A challenge system is in place, allowing each team two challenges per game. ABS is installed in 13 spring training ballparks, with roughly 60% of games slated for testing. Hawk-Eye technology is used, but the strike zone is a rectangle as defined by the rulebook, not the oval shape used by human umpires. Tests show slight increases in strikeouts and walks with ABS. MLB plans to refine broadcast displays and gather player feedback via the ProTABS app, aiming for potential integration as early as 2026 to assist, not replace, human umpires.

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Tech baseball

GTA V Remains King of Twitch, Hints at GTA VI's Immense Potential

2025-04-24
GTA V Remains King of Twitch, Hints at GTA VI's Immense Potential

Eleven years after its release, Grand Theft Auto V (GTA V) continues its reign as Twitch's most-watched game, accumulating over 1 billion hours watched last year! This dominance, alongside League of Legends also exceeding 1 billion hours, foreshadows the immense potential of the upcoming GTA VI. Other top performers include Call of Duty, Fortnite, and Valorant. Interestingly, V-Tubers also saw a 10% increase in viewership, reaching over a billion hours. GTA V's staggering numbers strongly suggest that GTA VI's launch later this year will be a monumental event.

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Game GTA V GTA VI

Malicious npm Packages Target React, Vue, and Vite Developers

2025-05-22
Malicious npm Packages Target React, Vue, and Vite Developers

Security researchers have uncovered malicious npm packages targeting the ecosystems of JavaScript developers using React, Vue, and Vite. These packages contained payloads designed to detonate on specific dates in 2023, with some having no termination date, creating a persistent threat. The attacker also uploaded legitimate packages to create a facade of legitimacy. Affected developers should immediately inspect their systems to ensure the malicious packages have been removed.

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The Double-Edged Sword of AI: Efficiency vs. Extinction of Crafts?

2025-06-20
The Double-Edged Sword of AI: Efficiency vs. Extinction of Crafts?

This article explores the impact of generative AI tools on various industries, particularly software development and art creation. Using the historical narrative of weavers and power looms, the author argues that while AI increases efficiency, it risks the extinction of traditional crafts and the pursuit of high quality. Concerns are raised about AI being used to cut costs rather than improve quality, along with its security vulnerabilities and detrimental effects on social equity. The author ultimately calls for a focus on the ethical implications of AI, preventing its misuse, and emphasizing the importance of high quality and human creativity.

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AI

Geocodio's Free Tier: Balancing Abuse Prevention and Legitimate Users

2025-02-24
Geocodio's Free Tier: Balancing Abuse Prevention and Legitimate Users

Geocodio maintains a free tier despite the risk of abuse. Initially, simple IP-based blocking led to poor user experience and wasted support time. They transitioned to a granular risk scoring system, using dozens of factors (browser, IP, email, etc.) to automatically identify and handle high-risk signups. Medium-risk signups might face CAPTCHAs or email verification. This system minimizes manual intervention, balancing security and user experience, ensuring the free tier's sustainability.

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ScanSearch Upgrades: Cloud Storage Integration & Expanded Document Storage

2025-03-16
ScanSearch Upgrades: Cloud Storage Integration & Expanded Document Storage

ScanSearch.com announces two new features: Cloud Storage Integration and Expanded Document Storage. Cloud storage integration lets users perform full-text searches across various cloud platforms like Google Drive, OneDrive, Dropbox, and Box, including scanned and non-searchable PDFs. Expanded storage allows users to upload and store Microsoft Office docs, Google Docs, CAD (DXF) files, and text files directly to ScanSearch, enabling full-text search across all files.

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Magnus Carlsen's Apparent Farewell to Classical Chess: A Turning Point?

2025-06-05
Magnus Carlsen's Apparent Farewell to Classical Chess: A Turning Point?

World Chess Champion Magnus Carlsen recently hinted at a waning passion for classical chess, sparking debate within the chess community. He cited the grueling preparation and intense pressure as contributing factors. The article explores the demanding nature of top-level classical chess, highlighting the hours of preparation, memorization, and lengthy games often ending in draws. The rise of chess engines and readily available databases has also leveled the playing field, diminishing the element of pure skill. However, Carlsen isn't abandoning chess entirely; he remains active in faster time controls and is a proponent of more creative formats like Freestyle Chess. The piece concludes by questioning the future of classical chess and the need for innovation to maintain its relevance and appeal.

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Open Source Software: A Cornerstone of Scientific Research

2025-06-04

This article explores the crucial role of open-source software in scientific research. The author argues that the freedom and reproducibility inherent in open-source software are essential for scientific progress, effectively addressing challenges in data processing, simulation, document preparation, and preservation. In contrast, proprietary software presents numerous risks, including restrictive licensing, software rot, and the inability to reproduce results. The article concludes by recommending several commonly used open-source software packages, such as GCC, GFortran, Julia, Typst, and Pandoc, and emphasizes the significant contribution of open-source software to scientific advancement.

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Tech
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