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The Block Stacking Problem

news.ycombinator.com Unknown 2025-11-10 02:01:44

The Block Stacking Problem John D. Norton Department of History and Philosophy of Science University of Pittsburgh https://sites.pitt.edu/~jdnorton/jdnorton.html February 21, 2025 1. Introduction In the block stacking problem, a collection of blocks are to be stacked at a table edge. If we stack the blocks so that they protrude past the edge of the table, how far can they go horizontally? The curious and then surprizing result is that we can extend the stack horizontally arbitrarily far.

Topics: block blocks edge mass stack

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Without the futex, it's futile

news.ycombinator.com Unknown 2025-11-12 21:53:42

Phil Eaton’s book club is starting The Art of Multiprocessor Programming, 2nd Edition , which is a very well regarded textbook, and pretty recently updated (2021). I’ve even heard of a couple of authors. I’ve done a lot of concurrent programming, and have always felt like I’ve still got plenty to learn, so I was excited for the topic. So far, what I’ve learned is that I would never recommend this book, despite any merits. Academia certainly struggles to find the right balance between teaching

Topics: futex lock mutex return thread

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A renovation project in Turkey led to the discovery of a lost city (2023)

news.ycombinator.com April White 2025-11-13 23:34:55

We live cheek by jowl with undiscovered worlds. Sometimes the barriers that separate us are thick, sometimes they’re thin, and sometimes they’re breached. That’s when a wardrobe turns into a portal to Narnia, a rabbit hole leads to Wonderland, and a Raquel Welch poster is all that separates a prison cell from the tunnel to freedom. A Fateful Swing of the Hammer Those are all fictional examples. But in 1963, that barrier was breached for real. Taking a sledgehammer to a wall in his basement, a

Topics: city derinkuyu local turkish underground

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Without the Futex, It's Futile

news.ycombinator.com Unknown 2025-11-14 21:53:42

Phil Eaton’s book club is starting The Art of Multiprocessor Programming, 2nd Edition , which is a very well regarded textbook, and pretty recently updated (2021). I’ve even heard of a couple of authors. I’ve done a lot of concurrent programming, and have always felt like I’ve still got plenty to learn, so I was excited for the topic. So far, what I’ve learned is that I would never recommend this book, despite any merits. Academia certainly struggles to find the right balance between teaching

Topics: futex lock mutex return thread

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T-Mobile claimed selling location data without consent is legal—judges disagree

arstechnica.com Unknown 2025-11-14 05:07:52

A federal appeals court rejected T-Mobile's attempt to overturn $92 million in fines for selling customer location information to third-party firms. The Federal Communications Commission last year fined T-Mobile, AT&T, and Verizon, saying the carriers illegally shared access to customers' location information without consent and did not take reasonable measures to protect that sensitive data against unauthorized disclosure. The fines relate to sharing of real-time location data that was reveale

Topics: customer information location mobile time

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Another Crypto IPO Hits the Market and Most People Still Have No Idea What Crypto Is

gizmodo.com Riley Gutiérrez Mcdermid 2025-11-15 16:50:36

Blockchain-based lender Figure Technology Solutions has officially filed for an initial public offering, marking another move by crypto-related firms seeking a slice of the trillion-dollar machine of public markets. Both crypto bros and the banks that love them are already celebrating the move to go public, which they say marks a significant milestone in the evolving intersection of cryptocurrencies, blockchain technology, and mainstream finance. Analysts posit that this signals a broader shif

Topics: blockchain company crypto figure public

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Show HN: I built an app to block Shorts and Reels

news.ycombinator.com Unknown 2025-11-15 08:01:38

Block Reels & Shorts on Instagram, Facebook, Reddit, YouTube. Set scrolling limits on any app with antiscroll mode. No Ads, No Reels, No Shorts, No Distractions. iOS has some limitations,so it’s not technically possible to block Reels and Shorts the same way as on Android. Although it can't be done the same way, I’m building an iPhone app with a different approach to help cut down on scrolling addiction. Drop your email and I’ll let you know when is launched!

Topics: app block reels scrolling shorts

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iOS 26 tweaks iPhone Always On Display in a way you might not like

9to5mac.com Zac Hall 2025-11-17 20:52:32

Apple’s Always On Display has been fairly consistent since it debuted on iPhone 14 Pro. With iOS 26, Apple has quietly changed how it works in a way that may not be obvious. Always On Display modes Instead of simply dimming your Lock Screen wallpaper, the system now blurs it by default. The tweak makes the clock and widgets stand out more, but it also defeats the purpose of displaying a photo if that’s what you like about the feature. Luckily, there’s also a toggle to bring back the original b

Topics: display ios like lock screen

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Faster Index I/O with NVMe SSDs

news.ycombinator.com Unknown 2025-11-17 23:17:20

The Marginalia Search index has been partially rewritten to perform much better, using new data structures designed to make better use of modern hardware. This post will cover the new design, and will also touch upon some of the unexpected and unintuitive performance characteristics of NVMe SSDs when it comes to read sizes. The index is already fairly large, but can sometimes feel smaller than it is, and paradoxically, query performance is a big part of why. If each query has a budget of 100-25

Topics: block data kb read reads

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Pebblebee Is Getting Serious About Personal Safety Tracking

wired.com Sophie Charara 2025-11-17 22:00:00

Think of Bluetooth trackers and safety in the past few years and your first thought might be the misuse of Apple AirTags and similar devices against women in domestic abuse and stalking cases. Alongside collaborative initiatives to counter and shut down these malicious uses (such as the IETF’s Detection of Unwanted Location Trackers, or DULT, standard), tracker makers themselves are flipping the script, turning tech that has been used to monitor women against their will into tech that protects

Topics: alert clip location pebblebee safety

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Security Bite: Mac.c is shaking up the macOS infostealer market, rivaling AMOS

9to5mac.com Arin Waichulis 2025-11-17 15:30:48

9to5Mac Security Bite is exclusively brought to you by Mosyle, the only Apple Unified Platform. Making Apple devices work-ready and enterprise-safe is all we do. Our unique integrated approach to management and security combines state-of-the-art Apple-specific security solutions for fully automated Hardening & Compliance, Next Generation EDR, AI-powered Zero Trust, and exclusive Privilege Management with the most powerful and modern Apple MDM on the market. The result is a totally automated Appl

Topics: apple mac macos malware moonlock

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How to use (or turn off) your Instagram Map

engadget.com Unknown 2025-11-17 14:00:35

Instagram Map, the new Instagram feature copying Snapchat's Snap Map, makes it simple to share your location with friends. So simple you might not understand who you're sharing it without digging into your settings. That's naturally led to confusion from some Instagram users as to how the feature works. If you already spend a lot of time on Instagram and are looking for a way to see where your friends have been, it's worth familiarizing yourself with how Instagram Map works. And if you're worri

Topics: friends instagram location map sharing

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TCL D2 Pro Review: This Fast Palm-Scanning Smart Lock Is No Jedi Mind Trick

gizmodo.com Wes Davis 2025-11-17 15:00:08

I love and hate smart locks. On one hand, it’s an undeniable treat to be able to get into my house even when I’ve forgotten my keys or make sure things are locked up when I’m away. But on the other, dead batteries, buggy software, and finicky wireless connections can evaporate that convenience, leaving me stuck on my porch, impotently stabbing my finger at a dead fingerprint sensor or waving my phone over a smart lock whose NFC reader just won’t respond. The palm-scanning, Wi-Fi-connected TCL D2

Topics: d2 lock pro smart tcl

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Model intelligence is no longer the constraint for automation

news.ycombinator.com Unknown 2025-11-17 15:44:49

The perception is that model improvement seems to be stagnating. GPT-5 wasn’t the step change that people were expecting. Yet, models continue to improve on reasoning benchmarks. Recently, both OpenAI and Google models were on par with gold medallists in the International Mathematical Olympiad 2025 (IMO). At the same time it’s still difficult to make AI agents work for relatively simple enterprise use cases. Why is there such a disparity in model performance between problem domains? Why are mode

Topics: context local model models task

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dbrand’s Joy-Con grip nightmare is coming to an end as it starts shipping replacements

androidauthority.com Unknown 2025-11-18 10:16:50

Oliver Cragg / Android Authority TL;DR Accessory maker dbrand has officially started shipping its Joy-Lock Grips. The replacement grips are designed so that Joy-Cons won’t detach from the Switch 2, even when 87% of the console’s weight is put on the magnetic hinge. The replacement kit also includes a set of Dock Adapter Friction Pads. Accessory maker dbrand is well-known for its high-quality products. However, the company recently found itself embroiled in controversy shortly after releasing

Topics: dbrand grips joy lock replacement

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Your ESR power bank could be a fire hazard - check it now

zdnet.com Artie Beaty 2025-11-19 00:24:00

Anna Efetova/Moment via Getty ZDNET's key takeaways ESR is recalling the HaloLock power bank over fire concerns. Affected power banks were sold on Amazon and other retailers. You can email ESR a photo of your device for a refund. Get more in-depth ZDNET tech coverage: Add us as a preferred Google source on Chrome and Chromium browsers. If you have an ESR HaloLock wireless power bank, you should stop using it immediately and contact the company for a refund. In a post Thursday, the United

Topics: bank com esr halolock power

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Velocity Micro Raptor Z95A Gaming PC Review: What Leaving It to the Pros Looks Like

cnet.com See Full Bio 2025-11-18 23:00:00

Velocity Micro Raptor Z95A Buy at Velocity Micro Pros Excellent gaming performance Tidy interior Ample upgrade options Cons Considerably more expensive than DIY So-so front connections If you want an extreme gaming PC without bloatware or the tedious work of configuring and building it yourself, the Velocity Micro SX3 Raptor Z95A stands out as a compelling option. It's pricey, but the folks at custom builder Velocity Micro put together a tidy system using almost exclusively standardized part

Topics: micro raptor tower velocity z95a

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Velocity Raptor Z95A Gaming PC Review: What Leaving It to the Pros Looks Like

cnet.com See Full Bio 2025-11-19 05:00:00

Velocity Micro Raptor Z95A Buy at Velocity Micro Pros Excellent gaming performance Tidy interior Ample upgrade options Cons Considerably more expensive than DIY So-so front connections If you want an extreme gaming PC without bloatware or the tedious work of configuring and building it yourself, the Velocity Micro SX3 Raptor Z95A stands out as a compelling option. It's pricey, but the folks at custom builder Velocity Micro put together a tidy system using almost exclusively standardized part

Topics: micro raptor tower velocity z95a

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Find Hub is working on a new way to quickly check your friends’ location (APK teardown)

androidauthority.com Unknown 2025-11-20 09:30:34

AssembleDebug / Android Authority TL;DR Google appears to be working on a home screen shortcut for users who are sharing their location with you in Find Hub. Right now, Google Maps already offers similar functionality. Bringing the option to the Find Hub reflects Google’s consolidation of tracking tools. Big things are in the works right now for the Find Hub on Android. Already this year we’ve seen it pick up this new name and add support for tracking people, and just over the past couple da

Topics: google hub location make right

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Velocity Raptor Z95A Gaming PC Shows What Leaving It to the Pros Looks Like

cnet.com See Full Bio 2025-11-20 11:00:11

Velocity Micro Raptor Z95A Buy at Velocity Micro Pros Excellent gaming performance Tidy interior Ample upgrade options Cons Considerably more expensive than DIY So-so front connections If you want an extreme gaming PC without bloatware or the tedious work of configuring and building it yourself, the Velocity Micro SX3 Raptor Z95A stands out as a compelling option. It's pricey, but the folks at custom builder Velocity Micro put together a tidy system using almost exclusively standardized part

Topics: micro raptor tower velocity z95a

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ESR issues recall for power bank due to fire risk - here's what you need to know and do ASAP

zdnet.com Artie Beaty 2025-11-21 00:41:20

Anna Efetova/Moment via Getty ZDNET's key takeaways ESR is recalling the HaloLock power bank over fire concerns. Affected power banks were sold on Amazon and other retailers. You can email ESR a photo of your device for a refund. Get more in-depth ZDNET tech coverage: Add us as a preferred Google source on Chrome and Chromium browsers. If you have an ESR HaloLock wireless power bank, you should stop using it immediately and contact the company for a refund. In a post Thursday, the United

Topics: bank com esr halolock power

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Over $300 million in cybercrime crypto seized in anti-fraud effort

bleepingcomputer.com Unknown 2025-11-21 05:15:34

More than $300 million worth of cryptocurrency linked to cybercrime and fraud schemes has been frozen due to two separate initiatives involving law enforcement and private companies. One initiative is the T3+ Global Collaborator Program launched by the T3 Financial Crime Unit (T3 FCU), a joint effort deployed almost a year ago by intelligence firm TRM Labs, TRON, and Tether, with Binance joining as the first official member - all major forces in the blockchain space. According to intelligence

Topics: blockchain chainalysis fraud million t3

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Cadillac’s Elevated Velocity concept could foreshadow the brand’s future in off-roading

theverge.com Andrew J. Hawkins 2025-11-22 15:00:00

is transportation editor with 10+ years of experience who covers EVs, public transportation, and aviation. His work has appeared in The New York Daily News and City & State. Posts from this author will be added to your daily email digest and your homepage feed. On the surface, Cadillac’s new Elevated Velocity looks like your typical concept car: gull-wing doors; a plush red interior; a retractable steering wheel for fully autonomous driving; and futuristic lighting scheme. But the real attenti

Topics: cadillac concept new performance velocity

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Changing these 6 settings on my iPad improved the battery life by hours

zdnet.com Maria Diaz 2025-11-23 05:00:14

Adam Breeden/ZDNET As an avid iPad user, I'm all too familiar with the internal struggles that course through me when the battery is about to die. I love using either the iPad 11 or iPad Air to write and work, but I also use it to stream content, play games, and browse the internet after work. This makes me appreciate the iPad's long battery life, yet my anxiety grows when I start getting 'low battery' alerts without a charger nearby. Also: How you're charging your tablet is slowly killing it

Topics: battery ipad lock turn use

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Google will help you pester your friends into turning location sharing on (APK teardown)

androidauthority.com Unknown 2025-11-24 09:52:53

TL;DR Google’s Find Hub combines resources for tracking devices and sharing location with friends and family. Users need to positively consent first before their location is shared with anyone. The app is working to build an easy way for you to request your friends grant that access. Smartphones are picking up new features and abilities all the time, and while some of those are pushed out to us enabled by default, others are going to require us to make the intentional choice to opt in. And wh

Topics: google hub like location sharing

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I found the easiest way to send files between my Android phone and desktop - and it's free

zdnet.com Jack Wallen 2025-11-24 20:28:58

Jack Wallen/ZDNET ZDNET's key takeaways Localsend makes sharing files on Android a breeze. You can share and receive files. Localsend works with Android, Linux, MacOS, and Windows. Android is my mobile OS of choice. As far as the desktop is concerned, I switch back and forth between Linux and MacOS (depending on what I'm doing). Often, I need to transfer files between Android and my two desktop operating systems, but finding the easiest method of doing so has been a bit of a chore. Until I

Topics: android desktop file files localsend

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Here’s how Google Find Hub satellite location sharing is going to work (APK teardown)

androidauthority.com Unknown 2025-11-25 05:26:52

TL;DR Google announced back in May that the newly renamed Find Hub would be adding support for satellite-based location sharing. That’s still not here yet, but a recent app update reveals text strings that hint at how things will work. Users will be able to share their location once every 15 minutes, with a daily limit on maximum shares. Satellite support is changing the rules of the game when it comes to mobile connectivity, and we are still right now only in the early days of its evolution.

Topics: location satellite string support update

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This palm-recognizing smart lock left me wondering how I lived so long without it

zdnet.com Maria Diaz 2025-11-26 00:30:17

TCL D1 Pro ZDNET's key takeaways The TCL D1 Pro smart lock is available for $170. This smart lock features some of the most reliable and fastest palm recognition technology I've tested, and it has a rechargeable battery instead of the standard replaceable batteries. The TCL D1 Pro's biggest downfall is the app, which is not user-friendly for customizing settings and feels outdated. $125.98 at Amazon Palm vein recognition is becoming quite popular among smart lock manufacturers, and the TCL D1

Topics: d1 lock palm smart tcl

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Pebblebee’s AirTag alternative can now share your real-time location in an emergency

theverge.com Andrew Liszewski 2025-11-27 20:00:00

is a senior reporter who’s been covering and reviewing the latest gadgets and tech since 2006, but has loved all things electronic since he was a kid. Posts from this author will be added to your daily email digest and your homepage feed. In July, Pebblebee announced a new safety feature for its Clip location tracker. Called Alert, it turns the Apple AirTag alternative into a panic alarm. Rapidly pressing the Clip’s button activates a flashing light and loud 97-decibel siren while also trigger

Topics: alert alive clip location pebblebee

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Saint Paul cyberattack linked to Interlock ransomware gang

bleepingcomputer.com Unknown 2025-11-28 21:03:24

The mayor of Saint Paul, Minnesota's capital city, has confirmed that the Interlock ransomware gang is responsible for a cyberattack that disrupted many of the city's systems and services in July. On July 29th, Minnesota Governor Tim Walz activated the National Guard in response to the crippling cyberattack that had affected St. Paul's digital services and critical systems. The city requested Minnesota National Guard's cyber protection support due to the cyberattack's impact exceeding St. Paul

Topics: city gang interlock paul ransomware

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Latest Tech News

The Block Stacking Problem

Without the futex, it's futile

A renovation project in Turkey led to the discovery of a lost city (2023)

Without the Futex, It's Futile

T-Mobile claimed selling location data without consent is legal—judges disagree

Another Crypto IPO Hits the Market and Most People Still Have No Idea What Crypto Is

Show HN: I built an app to block Shorts and Reels

iOS 26 tweaks iPhone Always On Display in a way you might not like

Faster Index I/O with NVMe SSDs

Pebblebee Is Getting Serious About Personal Safety Tracking

Security Bite: Mac.c is shaking up the macOS infostealer market, rivaling AMOS

How to use (or turn off) your Instagram Map

TCL D2 Pro Review: This Fast Palm-Scanning Smart Lock Is No Jedi Mind Trick

Model intelligence is no longer the constraint for automation

dbrand’s Joy-Con grip nightmare is coming to an end as it starts shipping replacements

Your ESR power bank could be a fire hazard - check it now

Velocity Micro Raptor Z95A Gaming PC Review: What Leaving It to the Pros Looks Like

Velocity Raptor Z95A Gaming PC Review: What Leaving It to the Pros Looks Like

Find Hub is working on a new way to quickly check your friends’ location (APK teardown)

Velocity Raptor Z95A Gaming PC Shows What Leaving It to the Pros Looks Like

ESR issues recall for power bank due to fire risk - here's what you need to know and do ASAP

Over $300 million in cybercrime crypto seized in anti-fraud effort

Cadillac’s Elevated Velocity concept could foreshadow the brand’s future in off-roading

Changing these 6 settings on my iPad improved the battery life by hours

Google will help you pester your friends into turning location sharing on (APK teardown)

I found the easiest way to send files between my Android phone and desktop - and it's free

Here’s how Google Find Hub satellite location sharing is going to work (APK teardown)

This palm-recognizing smart lock left me wondering how I lived so long without it

Pebblebee’s AirTag alternative can now share your real-time location in an emergency

Saint Paul cyberattack linked to Interlock ransomware gang

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