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A fast 3D collision detection algorithm

news.ycombinator.com Cairn O 2026-02-03 11:12:16

This article will assume some familiarity with narrow phase collision detection methods and associated geometric concepts such as the Minkowski sum. A few years ago I was watching Dirk’s great presentation, The Separating Axis Test between Convex Polyhedra (video, slides). Around the 18 minute mark (slide 29) he starts talking about overlaying Gauss maps of convex polyhedra to find the faces of their Minkowski difference. Figure 1: A gauss map for two convex hulls The upshot is that all faces

Topics: face function normals support vertex

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Tree Borrows

news.ycombinator.com Unknown 2026-02-03 11:40:24

The Rust programming language is well known for its ownership-based type system, which offers strong guarantees like memory safety and data race freedom. However, Rust also provides unsafe escape hatches, for which safety is not guaranteed automatically and must instead be manually upheld by the programmer. This creates a tension. On the one hand, compilers would like to exploit the strong guarantees of the type system—particularly those pertaining to aliasing of pointers—in order to unlock powe

Topics: borrows optimizations rust stacked tree

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Prime Day Turns This HP USB-C Dock Into a Practically Free Grab, Now 58% Off and stock Is Moving Fast

gizmodo.com Joe Tilleli 2026-02-03 11:25:41

You can get a lot done using just a laptop, but there is an upper limit when compared to a desktop PC. Laptop screens are much smaller than a standard desktop monitor. A 17-inch laptop is pretty large when stacked up against other laptop screens, but monitors tend to be almost twice that size or in some cases, even larger. Monitors be ultra-wide, display up to 4K, and showcase a larger field of view. And with monitors, you can add in more than one for even more workspace. Plus, you can get more

Topics: just laptop monitors station usb

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Apple AirPods Max Have Never Been This Cheap, Even Compared to Black Friday, Thanks to Prime Day

gizmodo.com Brittany Vincent 2026-02-03 11:50:49

There’s a certain kind of listening experience that sticks with you. It’s the moment a favorite song sounds clearer, fuller, more alive than it ever has before. You know you’re listening to a tune or album that you’ve heard before, but something about it hits much, much harder than usual. That kind of moment is what the AirPods Max were built for. And if you’re looking to try a pair, now’s a good time to buy them now that they’re on sale for Prime Day. ‘ Run to Amazon Prime deal now to get the

Topics: airpods cancellation feel listening max

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PR is your scaling power: Learn from Insight Partners’ Nikki Parker at TechCrunch All Stage

techcrunch.com Techcrunch Events 2026-02-03 11:15:00

PR and marketing are more than just press releases — they’re powerful tools for attracting investors, customers, and top talent. At TechCrunch All Stage on July 15, Nikki Parker, EVP of Marketing and Communications at global software investor Insight Partners, will break down the essential PR and marketing strategies every startup needs. From crafting compelling narratives and positioning your company for growth and fundraising to building a brand that stands out in a crowded market, this round

Topics: communications marketing parker pr stage

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Anker’s 12-in-1 Dock and Monitor Stand Combo Gets a Prime Day Cut as Amazon Clears Out Stock

gizmodo.com Joe Tilleli 2026-02-03 16:25:14

Prime Day is a go and Amazon right now is firing off on all cylinders. You can save a ton on a load of different products across every category. This is a great time to browse through some deals and find a cool thing you never thought you needed until you saw it. That for me is this Anker USB-C docking station. Now a docking station isn’t all that special or crazy, but what grabbed my eyes about Anker’s 675 is its shape. This docking station doubles as a monitor stand. Right now, it’s going for

Topics: docking inches right station usb

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Apple Didn’t Approve, but Amazon Clears Out AirPods Pro 2 at a Record Low for Prime Day

gizmodo.com Gizmodo Deals 2026-02-03 16:41:07

AirPods Pro 2 are in stores just a year but already they set the benchmark by which other wireless earbuds with active noise cancellation are judged. On the subject of sound quality, nothing else comes close to holding a candle right now. Normally these earbuds cost $249, but Amazon is offering them over 40% off during Prime Day, reducing the price to as low as $149. This deal is for everyone (and not just Prime members) and it is a rarity for an Apple device. Remember, Apple never really offer

Topics: active apple cancellation earbuds noise

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Federal ‘click to cancel subscriptions’ rule struck down in court [U]

9to5mac.com Ben Lovejoy 2026-02-03 21:54:53

A “click to cancel” law was last month passed in California, and now the FTC has ratified a federal rule designed to achieve the same goal. The idea of both is to force companies to make it as easy to cancel an online or app subscription as it is to sign up in the first place. Update: Following a court challenge, the US Eighth Circuit Court of Appeals has vacated the rule. See update at the end … Both laws were introduced in response to sketchy practices by companies designed to make it as dif

Topics: cancel companies make rule subscription

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Orb Is the Internet Speed Test Your Wi-Fi Has Been Waiting For

cnet.com See Full Bio 2026-02-03 20:00:00

Internet speed tests aren't just for people who obsess over their internet connection. When my friends or parents are experiencing an inevitable home internet slowdown, my first recommendation is always to start with a speed test. In fact, I’ve tested and used dozens of internet speed tests -- the market is pretty saturated with them. Ideally, the best internet speed test is one that diagnoses your bandwidth blues as simply as possible -- no ads, no extra features you can’t make sense of, and no

Topics: connection internet orb speed test

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Critical CitrixBleed 2 vulnerability has been under active exploit for weeks

arstechnica.com Unknown 2026-02-03 20:20:24

A critical vulnerability allowing hackers to bypass multifactor authentication in network management devices made by Citrix has been actively exploited for more than a month, researchers said. The finding is at odds with advisories from the vendor saying there is no evidence of in-the-wild exploitation. Tracked as CVE-2025-5777, the vulnerability shares similarities with CVE-2023-4966, a security flaw nicknamed CitrixBleed, which led to the compromise of 20,000 Citrix devices two years ago. The

Topics: citrix citrixbleed cve exploitation said

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BNY Mellon will have custody of Ripple's new stablecoin as institutional interest in crypto swells

cnbc.com Tanaya Macheel 2026-02-04 08:41:45

Bank of New York Mellon will be the primary custodian for the Ripple's U.S. dollar-pegged stablecoin reserves going forward, the two companies said Wednesday. The partnership should enhance regulatory compliance for Ripple, the issuer of ripple USD (RLUSD), and boost institutional credibility for the company as well as the fast growing stablecoin industry. BNY is the nation's oldest bank and primarily serves institutions and corporations. It also adds to the growing number of traditional insti

Topics: bny companies institutions ripple stablecoin

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5 surprise products Samsung could unveil at Unpacked today - including smart glasses

zdnet.com Cesar Cadenas 2026-02-04 05:00:17

Kerry Wan/ZDNET It's hard to believe that we're already halfway through 2025, and Samsung is kicking off the second half with force. The tech giant will hold its next Unpacked event today. Officially, we know very little about what will be shown on the big day, but that isn't to say that teaser information doesn't exist. Ever since the last Unpacked event back in January, several leaks and rumors have cropped up online, providing a view into what could be shown off on July 9. Also: What to ex

Topics: device event galaxy information samsung

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Show HN: Dev atrophy test – Can you still code without AI?

news.ycombinator.com Unknown 2026-02-04 04:00:32

Hey HN, I'm Per from Scrimba (YC S20), the code-learning platform. There's been a lot of talk lately about whether AI tools are causing skill atrophy amongst developers. We get a front-row seat to this, and we see more and more students struggle with basic concepts, and building apps on their own. This is almost always a consequence of relying too much on ChatGPT and vibe coding tools. So we built a small side project: https://devatrophy.com It's a test of your core web dev knowledge — no ha

Topics: ai atrophy coding dev questions

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iPod Linux (2017)

news.ycombinator.com Unknown 2026-02-03 21:27:39

Welcome to the home of the ! iPodLinux is an open source venture into porting Linux onto the iPod (https://www.apple.com/ipod/). So far, we have successfully ported a customized uClinux (http://www.uclinux.org) kernel to the iPod, and written a simple user interface for it dubbed podzilla. Additional applications and modules have been written, adding many capabilities not found in Apple's firmware. iPodLinux is currently safe to install on 1st, 2nd, and 3rd generation iPods. Software Developmen

Topics: apple currently generation ipod ipodlinux

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Is the doc bot docs, or not?

news.ycombinator.com Unknown 2026-02-04 03:38:29

July 8, 2025 Upgrading my Shopify email notification templates this morning, I asked Shopify’s LLM-powered developer documentation bot this question: What’s the syntax, in Liquid, to detect whether an order in an email notification contains items that will be fulfilled through Shopify Collective? I’d done a few traditional searches, but couldn’t find an answer, so I thought, okay, let’s try the doc bot! The reply came, quick and clean: {% if order.tags contains 'Shopify Coll

Topics: bot doc order shopify tion

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You’ll Regret It If You Already Have One: Kindle Paperwhite Hits a New Record Low This Prime Day

gizmodo.com Gizmodo Deals 2026-02-04 08:35:44

Every summer season, Kindle sales are the highest because people organize vacations and do not want to lug around stacks of books. The Kindle is the perfect travel companion: it occupies virtually no space, is as close to reading a real book as can be, and can hold thousands of books. For Prime Day, Amazon is providing Prime members with an unbeatable value on the Kindle Paperwhite Signature Edition (32GB), now priced at a new all-time low. It is currently marked down to $149, which is a massiv

Topics: amazon edition kindle paperwhite signature

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Wildfires are challenging air quality monitoring infrastructure

arstechnica.com Unknown 2026-02-04 08:30:07

Ten years ago, Tracey Holloway, an atmospheric scientist at the University of Wisconsin–Madison, would have said that air pollution in the United States was a huge success story. “Our air had been getting cleaner and cleaner almost everywhere, for almost every pollutant,” she said. But in June 2023, as wildfire smoke from Canada spread, the air quality dropped to historically low levels in her home state of Wisconsin. Just last month, the region’s air quality dipped once more to unhealthy level

Topics: air pollution quality said smoke

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Springer Nature book on machine learning is full of made-up citations

news.ycombinator.com Fernando Pessoa 2026-02-04 09:02:33

Would you pay $169 for an introductory ebook on machine learning with citations that appear to be made up? If not, you might want to pass on purchasing Mastering Machine Learning: From Basics to Advanced, published by Springer Nature in April. Based on a tip from a reader, we checked 18 of the 46 citations in the book. Two-thirds of them either did not exist or had substantial errors. And three researchers cited in the book confirmed the works they supposedly authored were fake or the citation

Topics: ai book citations cited use

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iPod Linux – Linux for Your iPod

news.ycombinator.com Unknown 2026-02-04 03:27:39

Welcome to the home of the ! iPodLinux is an open source venture into porting Linux onto the iPod (https://www.apple.com/ipod/). So far, we have successfully ported a customized uClinux (http://www.uclinux.org) kernel to the iPod, and written a simple user interface for it dubbed podzilla. Additional applications and modules have been written, adding many capabilities not found in Apple's firmware. iPodLinux is currently safe to install on 1st, 2nd, and 3rd generation iPods. Software Developmen

Topics: apple currently generation ipod ipodlinux

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Comparing the Climate and Productivity Impacts of a Shrinking Population

news.ycombinator.com Mark Budolfson 2026-02-04 05:39:44

All authors are affiliates of the Population Wellbeing Initiative at UT Austin. This paper subsumes the working paper “Population Decline: Too Small and Too Slow to Influence Climate Change” by the same authors. We thank Jared Bernstein, Maya Eden, Frank Errickson, Jim Feyrer, Chad Jones, Peter Kruse-Andersen, Kyle Meng, Marta Prato, John Podesta, Noah Scovronick, Robert Socolow, Phil Trammell, Sam Trejo, David Weil, Anson Zhou, Stéphane Zuber, Valeria Zurla and participants at the NBER’s confer

Topics: austin foundation paper research university

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Grow a Garden Calculator

news.ycombinator.com Unknown 2026-02-04 09:26:09

What is Grow a Garden Calculator? The Grow a Garden Calculator is a comprehensive tool designed specifically for Roblox's popular game "Grow a Garden". This advanced calculator helps players accurately determine plant values based on various game mechanics including weight, mutations, friend bonuses, and other multipliers. Our Grow a Garden Calculator serves as an essential resource for players who want to maximize their profits and make informed decisions about their garden investments. As the

Topics: calculations calculator garden grow plant

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How to get free Windows 10 security updates through October 2026: Two ways

zdnet.com Ed Bott 2026-02-04 08:50:00

MicroStockHub/Getty Images With just a few months remaining until the Windows 10 end-of-support date, Microsoft seems to have belatedly realized that owners of tens of millions of consumer PCs running Windows 10 aren't ready to replace their old computers, and they're also not about to fork over $30 for a one-year Extended Security Updates (ESU) subscription. So, at the end of June, just days before the end of its fiscal year, the company waved the white flag and announced new "free enrollment

Topics: 10 free microsoft options windows

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At the frontier between two lives–the evolutionary origins of pregnancy

news.ycombinator.com University Of Vienna 2026-02-01 11:17:47

This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Single-cell transcriptomic atlases of six mammalian species spanning the diversification of viviparity. Credit: Nature Ecology & Evolution (2025). DOI: 10.1038/s41559-025-02748-x An international research team led by scientists from the University of Vienna has uncovered new insights into how specialized cell types

Topics: cell cells evolution fetus maternal

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US court strikes down 'click-to-cancel' rule designed to make unsubscribing easy

news.ycombinator.com Joseph Gedeon 2026-02-04 08:59:31

A federal rule designed to make canceling subscriptions as easy as signing up for them has been struck down by a US federal appeals court just days before it was scheduled to take effect. The US court of appeals for the eighth circuit vacated the Federal Trade Commission’s “click-to-cancel” rule, which would have required companies to allow consumers to cancel subscriptions using the same method they used to sign up, after finding that the commission behind it failed to follow required procedur

Topics: commission complaints ftc rule subscriptions

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The Hidden Cost of OpenAI’s Genius

gizmodo.com Luc Olinga 2026-02-04 08:55:27

OpenAI is the undisputed poster child of the AI revolution, the company that forced the world to pay attention with the launch of ChatGPT. But behind the scenes, a desperate and wildly expensive battle is raging, and the cost of keeping the company’s geniuses in-house is becoming astronomical. According to a recent report from The Information, OpenAI revealed to investors that its stock-based compensation for employees surged more than fivefold last year to an astonishing $4.4 billion. That fig

Topics: company compensation openai revenue stock

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Breaking Git with a carriage return and cloning RCE

news.ycombinator.com David Leadbeater 2026-02-04 04:48:29

tl;dr: On Unix-like platforms, if you use git clone --recursive on an untrusted repo, it could achieve remote code execution. Update to a fixed version of git and other software that embeds Git (including GitHub Desktop). If you've ever used an old mechanical typewriter, you know that when you get to the end of the line there's a physical action to to get back to the start of the line. Sometimes this was done through an actual lever on the typewriter, later models had a button. Because this act

Topics: configuration git line return value

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The Earth's Rotation Is About to Spin Up So Much That Tomorrow Will Be Much Shorter Than Today

futurism.com Unknown 2026-02-04 16:17:57

The Earth's Rotation Is About to Spin Up So Much That Tomorrow Will Be Much Shorter Than Today I Want to Get Off Mr. Bones' Wild Ride "The cause of this acceleration is not explained." Spin Cycle The Earth's rotation is about to accelerate significantly. According to scientists, July 9, July 22, and August 5 of this year will be some of the shortest days in recent memory as a result, slicing well over a millisecond off the usual 24 hours, Timeanddate.com reports. That's despite the Earth's

Topics: acceleration days earth rotation scientists

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This tiny 2-in-1 charger solved my biggest problem with traveling - and it's on sale

zdnet.com Jada Jones 2026-02-04 21:33:00

ZDNET's key takeaways The Twelve South ButterFly SE is available for $100 in Midnight Plum, Iridescent, White, Black, and Pink. This charging station is highly compact, making it ideal for travelers and habitual end-of-night nightstand charging folks. You can only charge two devices at the same time, which may not be enough power for some. View now at Amazon The Twelve South ButterFly SE 2-in-1 Wireless Qi2 Charger is on sale during Amazon Prime Day, listing for just $70 ($30 off). Also: The

Topics: apple butterfly charging se station

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Product of Additive Inverses

news.ycombinator.com Unknown 2026-01-31 15:50:38

Product of Additive Inverses By Susam Pal on 29 May 2025 A negative number multiplied by another negative number results in a positive number. Most of us learnt this rule during our primary or secondary school years. 'Negative times negative equals positive' was a phrase drummed into us during mathematics lessons. In this article, we will prove this rule, not just for numbers but for any algebraic structure that, in a general sense, behaves somewhat like numbers. Contents Illustration Let u

Topics: additive cdot multiplication ring times

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Amazon Moves Fast, Roborock Qrevo S5V Is 40% Off Barely a Week After Hitting the Market

gizmodo.com Gizmodo Deals 2026-02-04 21:40:22

Roborock has become the most premium brand out there in the robot vacuum market with premium models like the Saros Series that fetch over $1,500. The company also does a great job of offering edge-of-the-time technology at a more affordable price for the masses: That’s exactly what you’ll experience with the new Qrevo S5V which just landed in stores and is available today in an incredible Prime Day bargain. Just a week after its release, Amazon is marking down this model 40% for Prime shoppers,

Topics: avoid qrevo s5v suction time

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Latest Tech News

A fast 3D collision detection algorithm

Tree Borrows

Prime Day Turns This HP USB-C Dock Into a Practically Free Grab, Now 58% Off and stock Is Moving Fast

Apple AirPods Max Have Never Been This Cheap, Even Compared to Black Friday, Thanks to Prime Day

PR is your scaling power: Learn from Insight Partners’ Nikki Parker at TechCrunch All Stage

Anker’s 12-in-1 Dock and Monitor Stand Combo Gets a Prime Day Cut as Amazon Clears Out Stock

Apple Didn’t Approve, but Amazon Clears Out AirPods Pro 2 at a Record Low for Prime Day

Federal ‘click to cancel subscriptions’ rule struck down in court [U]

Orb Is the Internet Speed Test Your Wi-Fi Has Been Waiting For

Critical CitrixBleed 2 vulnerability has been under active exploit for weeks

BNY Mellon will have custody of Ripple's new stablecoin as institutional interest in crypto swells

5 surprise products Samsung could unveil at Unpacked today - including smart glasses

Show HN: Dev atrophy test – Can you still code without AI?

iPod Linux (2017)

Is the doc bot docs, or not?

You’ll Regret It If You Already Have One: Kindle Paperwhite Hits a New Record Low This Prime Day

Wildfires are challenging air quality monitoring infrastructure

Springer Nature book on machine learning is full of made-up citations

iPod Linux – Linux for Your iPod

Comparing the Climate and Productivity Impacts of a Shrinking Population

Grow a Garden Calculator

How to get free Windows 10 security updates through October 2026: Two ways

At the frontier between two lives–the evolutionary origins of pregnancy

US court strikes down 'click-to-cancel' rule designed to make unsubscribing easy

The Hidden Cost of OpenAI’s Genius

Breaking Git with a carriage return and cloning RCE

The Earth's Rotation Is About to Spin Up So Much That Tomorrow Will Be Much Shorter Than Today

This tiny 2-in-1 charger solved my biggest problem with traveling - and it's on sale

Product of Additive Inverses

Amazon Moves Fast, Roborock Qrevo S5V Is 40% Off Barely a Week After Hitting the Market

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