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Graphical Linear Algebra

Applications are open for the ACT Applied Category Theory Research School 2018! And because arithmetic science and geometric science are connected, and support one another, the full knowledge of numbers cannot be presented without encountering some geometry, or without seeing that operating in this way on numbers is close to geometry; the method is full of many proofs and demonstrations that are made with geometric figures. Fibonacci, preface to Liber Abaci (first published 1202, 1228 manuscrip

The Absolute Worst Deals of July 2025’s Excessively Long Prime Day

At this point, Amazon’s July Prime Day should be called “Prime Week.” This latest manufactured shopping holiday is supposed to last for four days through Friday, July 11, exhausting our collective eyeballs with big red percentage stickers. If you weren’t tired of the number of tiring deals posts crowding the internet, Amazon’s extra-long shop-a-thon has already dealt us a fair share of discounted products that stretch what any sane person would consider a good buy. Same as it ever was. Already,

James Gunn's 'Superman' Isn't a Comic Book Movie. It's a Punk Rock Victory Lap

CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise. David Corenswet as the titular Kryptonian in James Gunn's Superman. Screenshot by Aaron Pruner/CNET There's a small, somewhat throwaway line spoken halfway into Superman by Rachel Brosnahan's whip-smart Lois Lane to David Corenswet's titular Kryptonian that is the key to what's really going on in DC's highly anticipated blockbuster. I'd go so far as to say

Samsung Plans to Launch a Trifold Phone This Year, Says Executive

While Samsung has been showing off mobile display concepts with three screens at trade events like CES for several years, it looks like it's finally bringing one to market. The new phone model failed to debut at Samsung's Unpacked event this week in New York. But in a press conference following the launch of its latest foldable phones, Roh Tae-moon, the acting head of Samsung Electronics' Device Experience Division reportedly confirmed that the company plans to launch a trifold phone by the end

10 Best Prime Day Mattress Deals Plus Top Bedding Sales (2025)

As you may have noticed, mattress shopping holidays aren't limited to just Memorial Day, Labor Day, or even the Fourth of July anymore. Now that Amazon Prime Day is nearly a week long, it's become something of a holiday in and of itself, so it makes sense that mattresses (plus other bedding!) will be on sale too, both on Amazon and beyond. We've listed our favorite Prime Day mattress deals that someone on our staff has tested themselves and personally vouched for. If you want to know more about

Here are 57 Prime Day deals you can nab for $50 or less

Theis also discounted to around $47 ($32 off) at Amazon and Best Buy , which is the lowest price we’ve seen on the compact Bluetooth speaker. Currently, it’s the smallest offered by Ultimate Ears, yet it doesn’t skip on features. It delivers a robust 12 hours of continuous playback, along with an IP67 rating for dust and water resistance. It’s small enough to throw in a hip bag, too, and can be clipped to everything from your shower head and backpack to the handlebars on your bicycle, allowing f

Topics: 12 99 best buy ultimate

Amazon warehouse workers lose jobs after Trump's immigration crackdown: 'We have done everything legally'

In this article AMZN Follow your favorite stocks CREATE FREE ACCOUNT A worker prepares orders at an Amazon.com Inc. fulfillment center. Jason Alden | Bloomberg | Getty Images Daphnee Poteau, a Haitian who came to the U.S in 2023, began working for Amazon last year at a returns center in Indianapolis. While packing up boxes, she met her husband Kristopher Vincent, who's been at the site, known as IND8, since 2013. Last month, Poteau was contacted by the Department of Homeland Security, after th

The Game Boy of my dreams is finally back in stock for good

ModRetro Chromatic The ModRetro Chromatic is the ultimate Game Boy, with an enhanced but authentic screen and exquisite build quality. If you can stomach the price tag, it's the best way to play original GB and GBC carts. The Game Boy was my very first gaming device, and it has always held a special place in my heart. My parents actually bought two classic DMG Game Boys (one for me and one for my older sister), but they both ended up in my collection once she developed a social life and I retre

Apple Maps in iOS 26 gains the proactive feature I’ve long needed

Apple Maps gets new features nearly every year, and iOS 26 is no exception. One brand new addition in iOS 26 could make Apple Maps vital for your daily commute, even if you don’t use it for navigation: proactive commute notifications. Commute notifications are coming to Apple Maps in iOS 26 Regular commutes are one of those occasions when using a maps app might seem unnecessary. If you travel to a place often enough—including, of course, your regular work or school drives—there’s little reaso

Topics: 26 apple commute ios maps

Palmer Luckey's ModRetro Chromatic portable console is now a thing you can actually buy

There's a new (ish) retro console on the block. The ModRetro Chromatic had a soft launch last year but is now "permanently in stock" for consumers. This is another machine that runs Game Boy and Game Boy Color cartridges, like the beloved Analogue Pocket and others. The Chromatic features a magnesium alloy build, so it should take a licking. It also features a backlit screen — something the original Game Boy lacked. As a matter of fact, Nintendo didn't fully embrace backlighting technology unti

The best Prime Day speaker deals are still up to 47 percent off on JBL, Bose, Sonos and others

Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products . It's not too late to grab the best Amazon Prime Day deals on bluetooth speakers, smart speakers and soundbars. For the first time ever, the July Amazon Prime Day sale is running for four straight days, so you've still got a chance to at enjoying sharp discounts on some of the best spe

Amazon Prime Day deals on Kindles and ereaders are still up to 36 percent off

Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products . Even the most affordable Kindle usually has a $110 MSRP, so holding out for the best Prime Day Kindle deals Amazon offers makes a lot of sense. Now that day three of the four-day sale is here, nearly every Kindle Amazon sells is seeing a discount — and a few have hit the best prices we

The Webb Telescope captures a mesmerizing view of the Cat's Paw nebula

Feast your eyes on the most mesmerizing feline foot known to humankind. The James Webb Space Telescope (JWST) captured this image of the Cat's Paw nebula. The European Space Agency (ESA) shared the picture to honor the telescope's three years of service. The Cat's Paw nebula is part of the Scorpio constellation. (You know, the one that looks like a scorpion?) It floats about 4,000 light years away from us. That translates to 23.5 quintillion miles. Put another way, that's a billion miles times

Topics: cat esa image paw years

The best Prime Day 3 deals 2025: Our favorite 125+ sales live now

Tharon Green/ZDNET When is Amazon Prime Day? Amazon Prime Day runs from Tuesday, July 8, to Friday, July 11, 2025. The annual two-day sale was extended to four days in 2025. How long will Prime Day last? Amazon Prime Day will last four days, running from July 8-11, 2025. That's two days longer than the years prior. Where will Prime Day take place? Amazon announced that its July Prime Day event will return in over 20 countries, including Ireland for the first time. Prime Day 2025 will retur

Superman Movies, Ranked

It took about 40 years from Superman first gracing the pages of a comic book to finally getting his own, full-fledged live-action blockbuster. In the 40 years since that, the Man of Steel has appeared on the big screen nine times, if you include this week’s latest iteration by James Gunn. By that math, we may be in for many, many more Superman movies over the next few decades. So, before that does or doesn’t happen, we thought it would be time to put them up against each other. Below, we have o

Inside Brembo’s brake factory, where technology is making better brakes

Brembo provided flights from Austin to Paris and accommodation so Ars could attend Le Mans and visit the Brembo factory. Ars does not accept paid editorial content. LE MANS, FRANCE—It's 2 am at the Circuit de la Sarthe, just a few hours from Paris, France. The 24 Hours of Le Mans race is nearly halfway through, and fans are late-night snacking, snoozing in their sleeping bags, or pressed up against the fence to watch the cars zip by. The sound is thunderous as a batch of hypercars pass, each br

The Best Prime Day MacBook Deal Is Not the One You Think

We've been hawking the M4 MacBook Air deal all week as we hunt for the best Prime Day deals, and for good reason, as $850 for the 13-inch M4 MacBook Air is a great price on what is clearly the best laptop you can currently buy. But now a MacBook deal has dropped that just might top it. Over at Walmart, you can now buy the M1 MacBook Air for just $599, bringing that laptop to an unprecedented low. That's $50 off the price it's been for the past year and $400 off the price it was when it launched

This Prime Day Eufy robot vacuum deal is still in stock and saves you 50 percent

Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products . One of our favorite robot vacuums from Eufy, the 11S Max, has dropped to $140 thanks to Amazon Prime Day deals. That's half off its regular price and one of the best discounts we've seen — and even better, it's still in stock as of right now on day three. This model earned a top spot

Google's Gemini app can now generate videos from static images

Starting today, Google is bringing image-to-video generation to the Gemini app. The feature comes courtesy of the company's Veo 3 model, which Google began rolling out more broadly to AI Pro users last week after it was initially only available to AI Ultra subscribers. Google To start using Gemini's image-to-video generation, click the "tools" option in the prompt bar and then select "video." Google is currently limiting Veo 3 to producing eight-second clips at 720p. Gemini will output your re

Amazon Prime Day 2025: The deals that the Engadget team spent our hard-earned money on

Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products . You didn't think we were going to cover all these deals and not buy some discounted goods ourselves did you? Amazon's Prime Day is in full swing, and now that two full days have passed, some of us have gotten past our decision paralysis and checked out our online shopping carts. It's

Forget the subscription: this fitness band has everything I need to track my progress

ZDNET's key takeaways The Amazfit Helio Strap is available now for $99. As a smartwatch alternative, the strap offers virtually all the same health tracking features via the robust Zepp app, with over a week of battery life. The fabric strap isn't made of exceedingly high quality materials, but luckily can be easily replaced. View now at Amazon Amazfit, makers of such smartwatches as the Bip 5 and the new Balance 2, just released its new Helio Strap, a fitness tracker that has all the core fu

The MacBook Air M4 brought me back to Apple (and at this price, I have no regrets)

MacBook Air M4 in Sky Blue Kyle Kucharski/ZDNET The MacBook Air M4 (15-inch) is on sale at Amazon during Prime Day, starting at $1,049 for the 16GB version. When Apple announced the MacBook Air M4 earlier this year, it was clear that the laptop would be an incremental upgrade from last year's model, with the latest in Apple silicon and a host of software and AI-powered features. The fact that the 13-inch version was $100 less was a pleasant surprise, however, positioning it as a competitive ch

Phoenix Joins Marvel Rivals on Friday: Here's What We Know About Season 3 So Far

Marvel Rivals season 3 is almost upon us, bringing with it the blessing of the Phoenix Force. Jean Grey, original member of the X-Men and sometimes terror of the cosmos, is joining the roster as a new duelist. As usual, we're also getting a new map, some balance changes and several quality of life changes when it comes to cosmetics. And hang in there, Daywalker devotees -- Blade is coming in Season 3.5 next month. Phoenix's abilities in Marvel Rivals Phoenix joins as yet another duelist -- an

Mazda reveals next-gen CX-5 details, including a hybrid, due in 2027

A new version of Mazda's popular CX-5 SUV is on the way. Earlier today, the Japanese automaker revealed details about the third-generation CX-5, which goes on sale in Europe later this year before coming here in 2026. The current CX-5, first introduced in 2017, marked Mazda's move upmarket, with a renewed focus on elegant interiors and keen handling without luxury automaker prices. Mazda remains committed to its core principle of "Jinba Ittai"—the horse and rider being at one—and the cars remai

Why Brembo uses endurance racing as a test bench for brake development

Brembo provided flights from Austin to Paris and accommodation so Ars could attend Le Mans and visit the Brembo factory. Ars does not accept paid editorial content. LE MANS, FRANCE—It's 2 am at the Circuit de la Sarthe, just a few hours from Paris, France. The 24 Hours of Le Mans race is nearly halfway through, and fans are late-night snacking, snoozing in their sleeping bags, or pressed up against the fence to watch the cars zip by. The sound is thunderous as a batch of hypercars pass, each br

The ModRetro Chromatic Game Boy is now permanently back in stock

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. After selling out all of its limited stock of First Edition handhelds last year, ModRetro has announced that its Chromatic Game Boy is now permanently back in stock. The company is also introducing a new white-and-purple cloud color option, new game cartridges, and a collection of accessories that includes a rechargeable battery. The Chromatic i

Prime deal brings first price drop on the Amazfit Active 2 fitness trackers

Ryan Haines / Android Authority Summer is the time to work on your fitness goals, and Prime Day has thrown up a great chance to save on a motivational companion to your journey. The Amazfit Active 2 Premium is currently available for just $99.99, down from its regular price of $129.99. That’s a 23% discount relative to its retail price, making it its first-ever price drop. Amazfit Active 2 Premium for $99.99 (23% off) If you’re more allured by the Amazfit Active 2 Sport, it’s also subject to a

Prime Day deal: The Google TV Streamer 4K drops to $84

Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products . Our top favorite streaming device is on sale for Prime Day and still in stock today. The Google TV Streamer 4K has dropped to $84 for the shopping event, which is a much better price than its normal $100 price tag. That's nearly an all-time low for the wedge-shaped gizmo. The Google T

I can't recommend this rugged power station enough to drone users (and it's at the lowest price ever)

The DJI Power 1000 power station in action. Adrian Kingsley-Hughes/ZDNET For Amazon Prime Day, the DJI Power 1000 is now down to $417, the lowest price we've seen and an excellent discount on a 1,000Wh power bank, making this a must-have for drone enthusiasts. Also: The best Prime Day deals we've found ZDNET's key takeaways The DJI Power 1000 power station It's a powerful, premium quality power station that's built to satisfy the needs of professional drone pilots. Unfortunately, there

Topics: 1000 ac max output power

Microsoft Outlook goes down around the world - here's what we know

NurPhoto / Contributor/Getty If you're having trouble logging in to your email this morning, you're (probably) not fired. A massive outage is affecting Microsoft's Outlook service, leaving many people unable to access their email accounts. Also: How passkeys work: The complete guide to your inevitable passwordless future Reports of problems started shortly before 10 p.m. ET Wednesday, but surged just before 7 a.m. ET. As of 9 a.m., reports were still on the rise, indicating there was no resol