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AI has mastered chess, so humans are changing the rules of the game

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The chess program Stockfish can crush Norwegian chess grandmaster Magnus Carlsen, who is largely considered the greatest player in history. However, it cannot replace him. These super-strong platforms have reshaped elite play and preparation, so top humans now use a combination of engines, surprise, and psychology to keep classical chess…
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Evan Monsma Turns a Broadcast Camera Viewfinder Into a Sharp Little Standalone TV

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Old Camera Viewfinder to TV Mod
Evan Monsma started with a viewfinder built for a professional broadcast camera. Inside sat a small monochrome CRT, the kind camera operators once relied on for precise framing during live shoots. He wanted that same screen to work on its own, showing ordinary video signals without the rest of the camera attached.



The original equipment came with an eight-pin connection that not only provided power but also transported video and control signals back and forth between the viewfinder and camera body. There wasn’t a publicly available pinout, so Monsma decided to get his hands dirty and open it up to see what was inside. He used a multimeter to map out each and every wire, and voilà! He discovered that a yellow conductor supplied around 12 volts of power, the black and red wires served as ground, and the video signal was transmitted via a grey line, and it turned out that just three connections were sufficient to operate the tube.


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He cut the factory wire and built a simple adapter, allowing the viewfinder to be powered by a wall power supply or a suitable battery via a regular DC barrel socket. He also installed an RCA jack to accept composite video; both connectors are now mounted on the rear of the enclosure, securely fastened using sticky adhesive and heat-shrink tubing to prevent them from coming away during regular operation. He cleaned up the old harness by attaching heat-shrink coverings to the unwanted wires and storing them out of sight.

Old Camera Viewfinder to TV Mod
The focus-peaking switch still works flawlessly, and you can adjust the brightness and contrast to achieve the ideal image. Monsmas also tested the side panel using an HDMI-to-composite converter and was pleased to note that even with the contrast turned down, text remained visible, and the dark part of the movie had more information than you’d see on many laptops under similar settings.

A wooden base is what gives the finished piece its proper shape. Monsma carved several channels into scrap wood to hide the cables underneath, painted the screw locations, and then secured the metal viewfinder body to the board with little machine screws. A application of Danish oil on the base and a fresh coat of white paint on the housing transformed it from a Frankenstein’s monster to something that looked like it belonged there.

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Old Camera Viewfinder to TV Mod
The original sunshade now flips over to provide a flat surface on top of which you can place another small gadget. You can have the viewfinder up and running in seconds; when the tube warms up, the image appears and remains solid. Monsma ran games via it and watched a variety of video clips; the analog approach produced none of the scaling artifacts commonly seen on low-cost contemporary displays.

The finished product takes up very little desk space while delivering a respectable image. Its analog input is compatible with antique cameras, game consoles, and any device that can output composite video, and a cheap converter makes it simple to connect to current sources. The hardwood mount keeps everything organized and the unit rock sturdy. The controls continue to respond as expected.
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Apple TV, HomePod mini updates are waiting for Siri’s upgrade

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Apple’s home hardware is about to get a shake-up this fall. While the Apple TV gets a bit of a performance boost, the HomePod mini will get a bunch more Siri functionality.

Apple has long been rumored to be working on a new HomeHub, but other household tech will get updates soon. That includes the Apple TV and the HomePod mini.

According to Mark Gurman’s “Power On” newsletter for Bloomberg on Sunday, Apple has sat on new hardware for the two models for months. Indeed, they’re already being actively used by Apple employees at Apple Park.

The refreshed hardware has been held back from launch because of software. Apple apparently wants to ship them alongside the long-awaited revamp of Siri and new Apple Intelligence features, making them destined for a fall launch.

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That said, the HomePod mini is suffering from limited availability, both online and at retail.

As for what’s changing, the Apple TV won’t get much of an update. A chip upgrade is almost certain, possibly with a slightly improved remote, but the Apple TV enclosure won’t change.

The HomePod mini, meanwhile, will go through a similar internally-facing glow-up. Outside, it will look pretty identical to the current spherical model, but the S5 chip will be updated to something much newer.

While they will chiefly be spec-bump updates, the changes should also allow the models to work with new Apple Intelligence and Siri features.

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One of our favourite Ninja air fryers just hit its lowest price yet

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Being able to cook a main and a side at the same time in one appliance – and have them both hit the table together, without one going cold while the other catches up – feels like an obvious idea, but most kitchens still can’t pull it off.

Well, the Ninja Foodi FlexDrawer looks to change that, and it’s currently down from £269.99 to £196.99 at Amazon, a saving of £73 that makes it the cheapest it has been since launch.

Ninja Foodi Flexdrawer on a pastel backgroundNinja Foodi Flexdrawer on a pastel background

A bestselling Ninja Foodi air fryer has crashed to its lowest price yet, despite Prime Day being weeks away

At just £196.99, this Ninja Foodi FlexDrawer deal brings a very clever air fryer down to a genuinely fantastic price.

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The FlexDrawer’s central idea is a single 10.4-litre drawer that a removable divider splits into two independent 5.2-litre cooking zones, each running a different temperature and function simultaneously, both finishing at the same time.

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Remove the divider entirely and that same drawer becomes a MegaZone capable of fitting a 2kg chicken or a full traybake, which makes it practical for households cooking for eight or more people rather than just couples doing mid-week meals.

Seven cooking functions cover Air Fry, Max Crisp, Roast, Bake, Reheat, Dehydrate, and Prove, giving it a range that goes considerably beyond the standard air fryer brief and into territory that would otherwise require multiple appliances on the worktop.

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Ninja’s own testing puts cooking speed at up to 65% faster than a fan oven, and energy use at up to 45% less. These figures are based on specific test conditions, but it should translate into genuinely shorter cook times and lower running costs over regular use.

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The drawer and crisper plates are dishwasher safe, the exterior is BPA-free, and the unit ships with silicone tongs and a chef-created recipe guide, so there’s no additional spending required to start cooking straight out of the box.

£196.99 is a strong price for a dual-zone air fryer with this much capacity and flexibility, and given this is already at its lowest price ahead of Prime Day, there’s no obvious reason to wait for the sale.

The Ninja Foodi FlexDrawer holds the award for the best large air fryer in our Best Air Fryer 2026 guide, where our experts have rated and reviewed the top options across all sizes and budgets.

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Someone Built A Manual Transmission Pen With A Working Clutch And Gear Shift

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A commonplace pen is one of the most unspectacular tools imaginable. Take the classic Bic Cristal, for instance: As of 2025, Bic has sold more than 120 billion of them. We’re used to grabbing pens without a second thought about them, but some pens have special mechanics behind them. This particular one, for instance, isn’t your standard color-switching option. 

Pens with working gear shifts and manual transmissions may seem like a silly idea, but they can actually be functional, and even rather practical. Roulton proudly declares that it offers “the world’s first manual transmission pen,” which switches between ink colors by means of a tiny working gear shift. Though it’s a novelty, for sure, the model, the engineering that YouTube’s Maker B put into making it work, and the practical advantages that the unique setup can offer is impressive. Here’s what went into building this unique writing implement.

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Making a manual transmission pen



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It can be difficult to resist a great fidget gadget. It’s common to find one that doubles as a pen, and because of the smooth and satisfying action of a stick shift (even a tiny one), this is exactly what this pen offers.

In April 2024, YouTube’s Maker B posted the video, which demonstrates their meticulous process for crafting the pen. The maker begins their work with precise machine-cutting of copper tubing, including the thread cutting that’s so crucial to the ‘twist’ motion of the components. Careful thread tapering and cutting, as well as the steady layer-by-layer crafting of the clutch pedal, is astonishing to watch, as each delicate component from the shifter to the housing of the push rods is custom made.

One commenter on the video declared that they’d spend a lot on this pen, and several others were soon jokingly competing to out-bid them. The demand was clearly there. As a result, Roulton ultimately began stocking the item, in two varieties. The Manual Transmission Pen is available in three different colors: Blue, Black, and Olive. They’re priced at $38.50, and there’s also a version of the standard pen that has been further customized with a stainless steel Shift Knob and Clutch Button. This particular version will cost $52.50, the so-called Manual Transmission Pen Pro. For further customization, replacement clutch buttons in either black, white, or red are $3.50 each. 

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How the Manual Transmission Pen works

There are a lot of veteran drivers who aren’t confident with working a manual transmission, which is also called a “stick shift”. Fortunately, as far as this pen’s concerned, Roulton‘s FAQs will get you up to speed quickly.

Simply shift gear and press the clutch button simultaneously to select the right position for operation, then let go of the clutch to write in the chosen color (purple, orange, green, blue, red, or black). Another press of the clutch button will return the pen to its ‘open’ position, allowing you to select another option. 

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Being a mechanical device, there may be times when the pen doesn’t operate correctly. Maker B has acknowledged that one potential issue is the gear shift not returning to the correct position to be re-used. Should this happen, the suggested answer is to extend the gear lever and move it between the positions carefully but forcefully, while keeping the button held down. 

This should resolve the issue, with the designer reporting that a tell-tale click should be heard to demonstrate this. That click is characteristic of the kind of feedback that a good manual gearshift provides (albeit in miniature), and part of what makes the whole idea so satisfying and tactile. Though this is not the first pen ever made with such a gear shift, the care and attention that Maker B puts into their creation is exquisite.

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Hackaday Links: May 31, 2026

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If you’re located in the Northeast United States and thought you heard an explosion yesterday afternoon, it wasn’t just your imagination — multiple sources have now confirmed that a 1 meter (3 foot) meteor entered the Earth’s atmosphere and broke up in the air off the coast of Massachusetts, releasing the energy equivalent of 300 tons of TNT.

Well, maybe. The latest update from NASA says it might actually qualify as a meteorite, with radar data indicating that debris from the space rock may have fallen into Cape Cod Bay. For those unfamiliar, the difference between a meteor and a meteorite is whether or not any of the object survived its encounter with the atmosphere and made it down to the surface.

There’s an argument to be made that a larger asteroid would have likely set off some alarm bells as it approached the planet, but the fact that this deep space interloper showed up unannounced is a sobering reminder that our ability to detect incoming threats isn’t nearly as robust as we’d like. Fortunately, it looks like the event didn’t result in any serious damage or injury.

Magnet fishers in Cape Cod are stoked.

Speaking of mid-air threats, here’s a reminder of what not to do on an airliner: on Saturday a flight departing Newark airport for Spain had to turn around when it was discovered a Bluetooth device bearing the name “BOMB” was onboard. There was no actual explosive device found on the plane when it was searched upon its return, and reports are that the whole incident was the result of an Ill-conceived device name on a portable speaker.

The details on this one are interesting, as a first-hand account posted to Reddit would seem to indicate that both the flight crew and teams back at United Airlines headquarters in Chicago were able to see the Bluetooth devices on the plane in real-time. The passengers were actually given several chances to turn off their devices before the order was given to turn the plane around, and at one point the crew claimed they were even able to see the number of Bluetooth devices that were still active.

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Admittedly, it could have been as simple as one of the crew members using an app on their phone to see how many discoverable Bluetooth devices they could pick up and reporting their findings back to the home office. But in the modern security climate, it’s not hard to imagine that the aircraft has some form of integrated Wireless Intrusion Detection System (WIDS). Something to keep in mind the next time they ask you to put your gadgets into airplane mode during takeoff.

It seems like every week we’ve been reporting on some service going dark, and today is no different. As pointed out by OMG Ubuntu, Canonical will be shutting down the Ubuntu Pastebin service in June. In fact, originally it was supposed to go offline today, but they’ve pushed the date back by a month due to the response from the community. Turns out giving your users just a few days to pack up their belongings before kicking them to the digital curb isn’t popular. Who knew?

Now granted Hackaday is geared more towards hardware than software, but a search through the database would seem to indicate we’ve never once run a post that linked to Ubuntu Pastebin in the 18 years the service has been available. Conversely, we had pages of results when searching our back catalog for instances of the classic pastebin.com. So we’re actually curious about this one and would love to hear from the readers: how many of you were actually using this service regularly, and will you miss it?

Finally, those in the market may be interested to hear that Wells Fargo will start offering mortgages for 3D printed homes produced by the Texas-based ICON Technologies. They’ve even got a special incentive program lined up for the extruded domiciles, offering a lender credit that can offset some of the closing costs.

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This might not sound like that big of a deal, but apparently most banks have been understandably skeptical of the technology and the long-term market for 3D printed homes up to this point. After all, it was just a few years ago that a recently completed 3D printed home in Iowa had to be demolished after the structure fell short of safety standards. As pointed out by CNBC, previous communities produced with ICON’s concrete printing technology had to be financed through the developer.

We’re still not sure that 3D printed homes make a whole lot of sense, but making the technology more accessible is surely a net positive. Even if the current state of the art in house squirting isn’t quite there, you know how the old saying goes: a journey of a thousand miles begins with a single layer.


See something interesting that you think would be a good fit for our weekly Links column? Drop us a line, we’d love to hear about it.

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Garmin’s Epix Pro Gen 2 is a huge 50% off, but you need to be fast

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Most smartwatches make you pick a side: style or substance. Garmin’s Epix Pro Gen 2 Sapphire Edition doesn’t.

It looks like a premium everyday watch, but underneath the titanium bezel, you’re getting one of the most capable multisport GPS tools around, which makes this huge price drop all the more tempting.

The Garmin Epix Pro Gen 2 Sapphire Edition is down from $999.99 to $499.99, a $500 saving that puts one of the most capable multisport GPS watches on the market at exactly half its original asking price.

Garmin Epix Pro on a sky blue backgroundGarmin Epix Pro on a sky blue background

Garmin’s Epix Pro Gen 2 Sapphire Edition has dropped to half price, though the offer won’t be around for long

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This Garmin Epix Pro deal makes a compelling case for anyone training across multiple disciplines to invest in some genuinely capable tech.

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The sapphire lens and carbon grey DLC titanium case aren’t cosmetic decisions dressed up as premium features — they exist because this is a watch built for people who train hard enough to genuinely need scratch resistance and structural durability on their wrist.

Underneath that build quality, the 1.3-inch always-on AMOLED display runs at 390 x 390 resolution, which is sharp enough that preloaded TopoActive maps, ski resort SkiView data, and golf course overlays are actually legible in direct sunlight without squinting.

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The Epix Pro Gen 2‘s Battery life reaches up to 16 days in smartwatch mode or 30 hours with GPS active, and SatIQ technology manages that balance automatically by switching between multi-band and standard GPS based on signal conditions, preserving runtime without sacrificing positional accuracy.

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The training metrics go considerably deeper than HRV and sleep tracking: Hill Score evaluates running strength on steep ascents using VO2 max and training history, while Endurance Score pulls data across all athletic disciplines to show how cumulative training load is actually affecting your fitness over time.

PacePro technology generates a GPS-based pacing strategy for a selected course or distance on race day, and the Visual Race Predictor uses your training data to estimate realistic finish times across 5K, 10K, half-marathon, and marathon distances before you’ve even toed the start line.

The built-in LED flashlight with variable intensities and strobe mode is a practical addition for anyone doing early-morning or late-evening sessions, and the safety and tracking feature automatically sends your live location if the watch detects an incident during a solo run or ride.

Half price is a significant discount for a watch built to this specification, and $499.99 makes a compelling case for anyone training seriously across multiple disciplines who has been waiting for the right moment to invest in something genuinely capable.

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Dear Craig, WWDC needs these

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Dear Craig: Your operating systems need some help, and we all know it. Hopefully, WWDC won’t just be a massive AI push.

I know it’s a bit weird writing to you, as you’d expect I’d be appealing to Tim Cook. He’s in a bit of a transition period right now, probably telling John Ternus where the keys to the executive volleyball court are kept and other important matters.

At the same time, you are the most appropriate person to write to about WWDC. It’s practically your event, since it deals primarily with big software changes that everyone will be able to use later in the year.

Then there’s your comedy shenanigans, adding humor to a keynote that would in any other company be a dry affair. That, and it regularly turns you into a meme that lasts long beyond the week’s end.

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Face it: you are WWDC Santa.

Anyway, as you and your software engineering “elves” prepare for the keynote and the tsunami of complaints that ensues, I do have some wishes for what you end up presenting to the world.

Siri desperately needs its revamp.

The first and obvious thing is AI. I know the rumors have talked about things like more editing options in Photos, but the big one is the Siri revamp.

This is a thing that we were told was on the way two long years ago. Instead, we were given reports of delays, including an overhaul of the workforce and how Siri was managed.

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I can appreciate you having an increased workload from that debacle.

Close-up of an iPhone screen showing camera modes including Siri, and a search bar with a dropdown menu offering Ask, Siri, and ChatGPT options

Mockup showing what’s expected to be the new design of Siri – image credit: Sam Hall, Bloomberg

We are all waiting for the smarter Siri, that can somehow determine who my mother is and what flight she’s on from my emails and messages with her. Followed by looking up when the flight is landing at an airport, when I should leave to pick her up, and whether or not to bring an umbrella.

You know, Siri that’s like the BBC interpretation of Sherlock Homes, or the main character from High Potential.

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As it stands, Siri and all of the underlying functionality works, but really, it just “works.”

We are still having to ask simpler questions to Siri, training ourselves to limit the queries to things it has a chance to answer, without going any further. Really, the training should be the other way around.

In comparison to the rest of the AI industry, Siri has to catch up to a massive degree. After using ChatGPT for a while and having a background of conversations, it can come up with fantastic responses tailored to my particular needs, based on that history.

If Siri can do the work to just half that level, it will be massive progress for Apple. At this stage, as Apple’s effective frontman for its AI effort, it desperately needs to get there.

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Also, as an aside, could you please fix which Siri gets activated if there are multiple Apple devices in a room? I have had successive Siri queries answered by a HomePod mini, an iPhone, and an iPad, without moving my head.

It’s quite disorienting at times.

(A)I have had enough

Of course, Apple isn’t going to just say that Siri has been updated. The rumors all point to it being a big song and dance about artificial intelligence in general.

Yes, the aforementioned Photos changes will be an item on the list. Visual Intelligence in the Camera app too.

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But really, there’s not much that’s been talked about for Apple-specific AI projects that could set the world on fire. Siri revamp aside.

Sure, you’ve got lots to shout about with the whole Google Gemini deal thing to bring Apple Foundation Models into shape. You’re also expected by the rumor mill to be embracing third-party AIs a lot more in your operating systems, too.

But, apart from Siri’s revamp, there’s not really that much to get excited about for AI, from a consumer perspective.

Middleaged man with gray hair leans close to an open MacBook in a dim room, face lit by the screen's glow, appearing focused and thoughtful

Craig Federighi peeking at way too much AI stuff ahead of WWDC – Image Credit: Apple

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AI is the future, we all get that, but beyond what we already have and an improved Siri, we don’t have any other tangible reason for using it fully on our devices.

What I want is for Apple to give me a reason to actually care about AI on my iPhone.

OpenClaw dominated the AI headlines with its whole “bringing AI locally to a Mac and agentic processing” thing. That was all manageable remotely, by AI enthusiasts whispering tenderly into their iPhones, using speech transcription to send commands over the Internet to their home server.

That is inspiring stuff. But I want it all done on the iPhone.

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There’s enough smarts to do onboard processing, or at least to process enough to issue commands to agents elsewhere to do the real work. Why can’t we have that?

I want to yell at Siri to find a photo of someone from my iCloud, perform edits using Adobe Express or whatever software, and send that in an email to someone. All from one command.

Seriously. This would be a massive use of AI that would be astounding for Apple.

It’s doubtful that your fantastic hair memes will be joined by something like that this year. But please, at the very least, make me really care about iPhone-based AI.

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Breaking it down for the family

The last thing I ask for you to include in WWDC is quite simple. I want at least one big feature reveal that isn’t AI-specific.

This sounds deceptively simple, and really, it is.

So far, the impressions from the rumor mill has you shepherding an operating system update that is chiefly about AI, but also about stability. Less about features, more about making what already exists work harder, better, faster, and somehow stronger.

Middleaged man in a light blue shirt dramatically running his hand through his hair while walking toward the camera inside a large, futuristic, silver and white circular room

Federighi memes are not discussable product features. – Image Credit: Apple

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That’s a perfectly fine thing to do, Craig. You did a lot with the whole Liquid Glass thing last year, so taking a moment to steady the ship and shore things up makes sense.

Indeed, with the whole MacBook Neo thing and a strain on memory pricing that will impact upgrades going on, this could be a good thing. Making the software work better without necessarily requiring a hardware update would be great from a consumer standpoint.

Though at the same time, it puts me in a bind.

Aside from our readers, I have to inevitably explain to my mother and other family members about what’s new. So far, that breakdown consists of Siri’s changes, nebulous AI stuff that probably won’t matter, and that’s really it.

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Seriously, the whole conversation is about AI, which the public has a love-hate relationship with, and is chiefly dominated by New Siri.

Just throw me a bone here and include something, anything that makes this operating system update a thing I can talk about.

I mean it. If the main talking points are just Siri and AI in general with everything else being minimal, I will have little choice but to make up an entertaining lie for her.

“Halfway through the presentation, that software chief with the hair had an impromptu paintball game, and Cook declared that no one would take him down,” I said.

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Give me something to talk about, Craig. Please.

Sincerely, Malcolm. Not aged 9.

Last week’s Sunday Reboot covered Apple’s iPhone-recorded MLS match, Epic Games’ confusing messaging, and Plex’s expensive decision.

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NYT Strands hints and answers for Monday, June 1 (game #820)

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Looking for a different day?

A new NYT Strands puzzle appears at midnight each day for your time zone – which means that some people are always playing ‘today’s game’ while others are playing ‘yesterday’s’. If you’re looking for Sunday’s puzzle instead then click here: NYT Strands hints and answers for Sunday, May 31 (game #819).

Strands is the NYT’s latest word game after the likes of Wordle, Spelling Bee and Connections – and it’s great fun. It can be difficult, though, so read on for my Strands hints.

Want more word-based fun? Then check out my NYT Connections today and Quordle today pages for hints and answers for those games, and Marc’s Wordle today page for the original viral word game.

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Nvidia leak spoils multiple variants of its upcoming N1-series processors

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NVIDIA’s upcoming N1-series processors may have been officially scheduled for a reveal, but a fresh leak appears to have spoiled the party a day early. New specifications shared by VideoCardz’s insider outline not only the flagship N1X chip but also several additional variants, suggesting Nvidia is preparing a much broader push into PC processors than previously expected.

The headline-grabber is the N1X, which reportedly mirrors the configuration of Nvidia’s GB10 chip used in the DGX Spark AI system. But it’s the smaller, more affordable N1 models that could have the biggest impact if Nvidia intends to bring Arm-based processors to mainstream laptops.

The N1X looks every bit like a flagship

According to the leaked specifications, the top-end N1X packs a 20-core CPU setup split between Cortex-X925 and Cortex-A725 cores. On the graphics side, it reportedly scales up to 48 Streaming Multiprocessors, translating to 6,144 CUDA cores. A slightly cut-down version is said to feature 40 SMs and 5,120 CUDA cores. Both chips operate within a 45W to 80W power envelope, putting them in territory normally occupied by premium gaming laptop processors.

Memory support is equally ambitious. The N1X is rumored to support up to 128GB of LPDDR5X memory and provide enough PCIe connectivity for multiple high-speed storage devices. On paper, it looks like a serious workstation-class platform.

The standard N1 could be the real story

While flagship silicon always attracts attention, the standard N1 may be the processor that matters most. Leaked configurations point to 12-core and 10-core variants paired with significantly smaller GPU blocks, ranging from 2,048 to 2,560 CUDA cores. These chips are reportedly designed for an 18W to 45W power range, placing them squarely in the thin-and-light laptop category. Think of the kind of machines where battery life, AI features, and portability matter more than squeezing out every last frame in a game.

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That positioning could make the N1 Nvidia’s answer to the growing wave of Arm-powered PCs currently being championed by companies such as Qualcomm. One particularly interesting detail is that at least one of the leaked presentation slides reportedly dates back to 2024, suggesting Nvidia has been quietly developing these processors for quite some time. The company is expected to lift the curtain on the N1 family soon, and while not every leaked variant may make it to market, the roadmap paints a clear picture: Nvidia’s PC ambitions appear much bigger than a single flagship chip.

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XTAR AA 1.5V 3960 Rechargeable Li-ion Battery Review

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Verdict

A clever set of Li-ion batteries, the touch-to-check LED system lets you know if the XTAR AA 1.5V 3960 Rechargeable Li-ion Battery cells are ready to go or not. With long life and high capacity, these can be a good replacement for alkaline batteries in most cases, particularly high drain uses, such as torches and toys. There’s no built-in charging, so you’ll need to account for a Li-ion charger if you don’t have one, but that’s the only real potential downside.

  • High capacity

  • Integrated battery charge status

  • Holds charge well

  • Will most likely require a new battery charger

Key Features

Introduction

Rechargeable AA Li-ion batteries are becoming more popular. Capable of a constant 1.5V output and maintaining their charge, they’re a lot closer to alkaline batteries than standard rechargeables. However, the XTAR AA 1.5V 3960 Rechargeable Li-ion Battery is the first I’ve seen not to include a USB-C port for charging.

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It means you need a Li-ion-compatible charger, but the total capacity is higher than that of its rivals, making these a good choice in most situations, particularly where you need high capacity.

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Design and Charging

  • Charge indicator onboard
  • Long life (1500 charge cycles)
  • Needs a Li-ion charger

The first set of Li-ion AA batteries that I saw were the Paleblue AA USB-C Rechargeable Batteries, which have a USB-C port onboard for direct charging. Here, things are different, and the XTAR AA 1.5V 3960 Rechargeable Li-ion Battery looks much like a regular rechargeable battery, with nothing distinguishing it from the outside.

XTAR AA 1.5V 3960 Rechargeable Li-ion Battery close-upXTAR AA 1.5V 3960 Rechargeable Li-ion Battery close-up
Image Credit (Trusted Reviews)

That means you need a charger compatible with Li-ion batteries. Use a regular battery charger and you can destroy these batteries. I was sent an XTAR L8 charger, which can take eight batteries (AA or AAA via the included adaptors). This charger senses the battery type (Li-ion or NiMH) and then charges them correctly.

XTAR AA 1.5V 3960 Rechargeable Li-ion Battery charger with adaptors for AAAXTAR AA 1.5V 3960 Rechargeable Li-ion Battery charger with adaptors for AAA
Image Credit (Trusted Reviews)

Press and hold the positive terminal on top (I found that it needs a bit of pressure and, sometimes, pressing and holding for a few seconds), and a green light turns on to show that these batteries are different: one flash means 0% to 20% charge; two flashes for 20% to 50% charge; three for 50% to 80% charge; and four for 80% to 100%. It’s a handy indicator of whether the batteries are ready to go or not.

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Each battery has a capacity of 2500mAh, which is 1000mAh higher than the Paleblue ones. At this capacity, the XTAR AA 1.5V 3960 Rechargeable Li-ion Battery is similar to many NiMH batteries.

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XTAR says that these batteries can last for 1500+ charge cycles, which is also similar to a lot of NiMH batteries. That means that you can charge and discharge these batteries 1500 times, so each one effectively replaces 1500 alkaline batteries.

Li-ion batteries, such as these, have two main advantages over NiMH: they discharge at a higher rate (1.5V vs 1.2V) and hold their charge for longer.

Performance

  • High capacity
  • Can replace alkaline batteries in some circumstances

To test these batteries I used an XTAR VX4, which is designed for NiMH and Li-ion batteries, testing capacity with a 300mA current. On average, across the four XTAR AA 1.5V 3960 Rechargeable Li-ion Battery cells that I had, the total capacity was a high 2583mAh – that’s only slightly behind the Ansmann Digital AA HR6 2850mAh.

That makes these batteries ideal for high-drain devices, such as torches and toys. I also fitted them to my Yale Linus smart lock. When fitted with NiMH batteries, this lock complains that the batteries are low; with the XTAR AA 1.5V 3960 Rechargeable Li-ion Battery the lock worked correctly.

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There may be some devices that these batteries don’t work with, but in many cases you can replace alkaline batteries with these.

Should you buy it?

You need high-capacity alternatives to alkaline batteries

With a high tested capacity, these batteries can replace standard alkaline batteries in a lot of cases.

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You want something cheaper

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If you’ve got devices that are less fussy, then you can buy high capacity NiMH batteries for less.

Final Thoughts

It all depends on what you want to use the batteries for. If you want to replace alkaline batteries with a greener alternative, the XTAR AA 1.5V 3960 batteries work out as good value over their lifetime, and they cost a similar amount to the lower-capacity Paleblue AA batteries; however, you do need to account for buying a Li-ion battery charger.

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If you have devices that will work with NiMH batteries and just need high-capacity, powerful cells, then you’ll find something cheaper on my list of the best rechargeable batteries.

How We Test

We test every rechargeable battery we review thoroughly over an extended period of time. We use standard tests to compare features properly. We’ll always tell you what we find. We never, ever, accept money to review a product.

Find out more about how we test in our ethics policy.

  • Capacity and voltage tested with an XTAR VX4.
  • Used in real-life appliances to check compatibility.

FAQs

How do you charge the XTAR AA 1.5V 3960 Rechargeable Li-ion Battery?

You need a battery charger that’s compatible with Li-ion batteries – do not use a standard battery charger.

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Test Data

  XTAR AA 1.5V 3960 Rechargeable Li-ion Battery
Battery tested capacity 2583 mAh

Full Specs

  XTAR AA 1.5V 3960 Rechargeable Li-ion Battery Review
Manufacturer
Battery 2500 mAh
Size (Dimensions) x x INCHES
Release Date 2026
First Reviewed Date 28/04/2026
Model Number XTAR AA 1.5V 3960 Rechargeable Li-ion Battery
Battery type Rechargeable
Battery technology Lithium-ion
Battery size AA

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