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Writing a Truth Oracle in Lisp

This post assumes some familiarity with typed functional programming, Lisp, and formal logic. Today we will attempt to write a truth oracle in Lisp. By "truth oracle," I mean a program that can determine whether arbitrary mathematical statements are true or false. This might sound impossible, due to first-order logic being undecidable, but let's try anyway. Before that, though, we need to go over some required concepts. Extracting information from proofs First, sometimes, we can extract info

Sonos speakers and soundbars are on sale for record-low prices

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 . Sonos is selling a bunch of its speakers at a discount on its own site and Amazon. This includes the well-regarded Era 300 smart speaker, which is down to just $359. That's 20 percent off and notable because this particular speaker rarely goes on sale. It's a Sonos miracle! The deal a

Shaping Light – Volumetric Lighting

As I became more familiar with post-processing over the past few months, I was curious to push those newly learned techniques beyond pure stylization to achieve something more functional. I wanted to find new ways to enrich my 3D work which wouldn't be possible without leveraging effects and passes alongside custom shaders. As it turns out, post-processing is great entrypoint to enhance a 3D scene with atmospheric and lighting effects, allowing for more realistic and dramatic visuals. Because t

The best Chromebooks for students in 2025: Expert tested and reviewed

Let's face it: having a laptop for school is a necessity. But toting around a bulky, slow computer from five years ago is not the vibe. Opting for a Chromebook is a solid choice for students: they're lightweight, fast, and typically cost far less than Windows PCs or Apple MacBooks. Chromebooks run on ChromeOS, a streamlined operating system that integrates with Google Drive, making it easy to navigate to apps like Google Docs, Google Drive, and Gmail so you can stay on task and in touch with te

iOS 26 is official, Liquid Glass redesign, and our full WWDC 2025 reactions

Benjamin and Chance are back with another bumper WWDC installment, featuring our thoughts on everything Apple announced during its 2025 keynote. From new features in iOS 26 to the sweeping redesign of Liquid Glass, we give our first reactions of all the changes in the new operating systems. And in Happy Hour Plus, Chance talks more about his experience on the ground at Apple Park. Subscribe at 9to5mac.com/join. Hosts Chance Miller Benjamin Mayo Subscribe, Rate, and Review 9to5Mac Happy Hou

Apple announces global in-person sessions to dive deeper into WWDC25 updates

Apple is taking WWDC25 on the road. Following the close of its week-long developer conference, the company has scheduled a worldwide series of in-person events and online appointments to give developers, designers, and product managers a closer look at what’s new. Here’s how you can register. Branded as “Explore the biggest updates from WWDC25”, (via MacMagazine) these sessions aim to highlight key technologies unveiled during the conference, including updates to Apple Intelligence, visionOS, d

Get a free Amazon gift card when you sign up for a discounted NordVPN plan

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 . While it didn’t quite make the cut in our guide to the best virtual private networks (VPNs), NordVPN remains one of the more popular providers out there for a reason, and right now you can save up to 76 percent on its two-year plans, with an Amazon gift card thrown in as a sweetener. W

We May Be a Step Closer to Seeing the Original ‘Star Wars’ Again

Fans can argue day and night about Lucasfilm president Kathleen Kennedy but there’s no denying she pulled an awesome move earlier this week. As previously reported, the British Film Institute had been advertising that it would be screening a very rare print of George Lucas’ Star Wars from its original theatrical run. It’s the version of the film you can basically never see anymore, at least not officially, so Kennedy showed up at the event to change that. “I’m here to make sure you don’t think

Play FBC: Firebreak, Deus Ex and More on PlayStation Plus Soon

Remedy Entertainment released the mind-bending action game Control in 2019. And on June 17, PlayStation Plus Extra and Premium subscribers can return to the Federal Bureau of Control in the wacky, first-person co-op shooter FBC: Firebreak. PlayStation Plus is Sony's version of Xbox Game Pass, and it offers subscribers a large and constantly expanding library of games. There are three PlayStation Plus tiers -- Essential ($10 a month), Extra ($15 a month) and Premium ($18 a month) -- and each giv

This stylish Beats speaker is one of my summer must-haves, and it's on sale right now

ZDNET's key takeaways Beats' latest Pill speaker is available for $150 in five colorways: Statement Red, Matte Black, Champagne Gold, Navy Blue, and Blush Pink. An impressive battery life and a subtle, clean design set the Beats Pill apart from its competitors. However, Beats' overemphasized, bass-forward sound can mask the other aspects of a song. $99.99 at B&H Photo-Video The Beats Pill (2024) is currently on sale for $100, $50 off its original price. Beats recently released two new Pill co

Luxe Game Engine

luxe A lovingly crafted cross platform game engine About luxe is a cross platform, rapid development game engine to make games for Mac, Linux, Windows, and Web, with console support in development. luxe is an easy to learn game engine for making 2D or 3D games. As an engine it prioritizes design and workflow for rapidly expressing ideas. Designed as a 2D first engine, luxe aims to provide a strong 2D toolset ready to make games. This applies whether it's a one hour or one+ year project.

Beyond Bluesky: These are the apps building social experiences on the AT Protocol

A year ago, Bluesky was opening up to the public and was known as one of the many X competitors that emerged after Elon Musk acquired the network formerly known as Twitter. Today, Bluesky’s social network has grown to over 36.5 million users, while the technology it’s built upon — the AT Protocol (or ATProto for short) — is being used to develop dozens more applications designed to work together as part of an open social web. The developers behind many of these apps attended the first conferenc

Senator’s RISE Act would require AI developers to list training data, evaluation methods in exchange for ‘safe harbor’ from lawsuits

Join the event trusted by enterprise leaders for nearly two decades. VB Transform brings together the people building real enterprise AI strategy. Learn more Amid an increasingly tense and destabilizing week for international news, it should not escape any technical decision-makers’ notice that some lawmakers in the U.S. Congress are still moving forward with new proposed AI regulations that could reshape the industry in powerful ways — and seek to steady it moving forward. Case in point, yest

Topics: ai lummis new public rise

I found a Linux distro that combines the best parts of other operating systems (and it works)

Jack Wallen/ZDNET There are so many Linux distributions on the market, and they range from the command line only all the way to functioning works of art. The majority of distros fall somewhere in the middle, of course, and that's perfectly fine because most users prefer a blend of aesthetics and functionality. That's why the likes of Linux Mint, ZorinOS, elementaryOS, and Ubuntu are so popular. But every once in a while, a team releases an update to its distribution that reminds you that Linux

Gamefam brings FIFA Club World Cup 2025 to Roblox

Roblox game studio Gamefam announced today it is collaborating with FIFA to bring the FIFA Club World Cup 2025 to its game Super League Soccer. The two are holding a major event within the game leading up to the Club World Cup to raise the tournament’s profile with Roblox’s Gen Z and Alpha-aged audience. All 13 of the participating football clubs are playable in Roblox for the first time, with the event set to kick off on June 14 and running through July 13 alongside the real Club World Cup. Ac

What Is Cellular Internet And Is It A Reliable Broadband Connection?

The latest report from the American Customer Satisfaction Index highlights that for the first time ever, a non-fiber internet provider, T-Mobile 5G Home Internet, matched in score with AT&T Fiber. In other words, customers are just as happy with a cellular internet service over a wired one through fiber. Cellular internet doesn't deliver fast speeds in comparison to fiber. However, it could still be a lifeline for disconnected communities in rural areas. According to the latest Pew Research Cent

Cloudflare: Outage not caused by security incident, data is safe

Cloudflare has confirmed that the massive service outage yesterday was not caused by a security incident and no data has been lost. The issue has been largely mitigated. It started 17:52 UTC yesterday when the Workers KV (Key-Value) system went completely offline, causing widespread service losses across multiple edge computing and AI services. Workers KV is a globally distributed, consistent key-value store used by Cloudflare Workers, the company’s serverless computing platform. It is a funda

Today's NYT Mini Crossword Answers for Friday, June 13

Looking for the most recent Mini Crossword answer? Click here for today's Mini Crossword hints, as well as our daily answers and hints for The New York Times Wordle, Strands, Connections and Connections: Sports Edition puzzles. So, there's kind of a dad joke in today's NYT Mini Crossword. 4-Across is "dessert wine," and 6-Across is "desert whine." You can almost hear the rimshot from here. Thankfully, today's puzzle is no joke; it's pretty simple. But you could still get stumped. Need some help

Best Internet Providers in Columbus, Ohio

What is the best internet provider in Columbus? CNET's broadband experts recommend AT&T Fiber as the best internet service provider in Columbus, Ohio. It's not hard to see why: the ISP has reasonable pricing, ranging from $55 to $245, as well as the fastest speeds in the area with 2 and 5 gigabits, respectively. However, its biggest pitfall is that its geographic reach isn't 100% -- so those not in the region will need to look elsewhere. But there are plenty of great alternatives, such as Spect

BlueAnt Soundblade under-monitor speaker drops to a record-low price!

Are you looking for some PC speakers? I came across this one at CES, a couple of years ago, and let me tell you, it’s what I would buy if I needed good desktop audio. The thing is, I wasn’t a big fan of the $199.99 retail price. The BlueAnt Soundblade is currently available at just $94.99, which happens to be its record-low price. It’s looking much more enticing now! Buy the BlueAnt Soundblade for just $94.99 ($105 off) This offer is available from Amazon. The discount applies to all color vers

Bluesky backlash misses the point

Bluesky is missing an opportunity to explain to people that its network is more than just its own Bluesky social app. In recent weeks, a number of headlines and posts have surfaced questioning whether Bluesky’s growth is declining, if the network has become too much of a left-leaning echo chamber, or if its users lack a sense of humor, among other charges. Investor Mark Cuban, who even financially backed Skylight, a video app built on Bluesky’s underlying protocol, AT Proto, complained this we

‘Andor’ Wanted Its Massacre to Do More Than Just Fill a ‘Star Wars’ Lore Gap

The most impactful thing about the Ghorman Massacre in Andor season two is how it paints a true picture of what rebellion stood for by putting the audience in the shoes of the people assembled to defend their planet. In a grim yet hopeful episode, the Empire’s control of the narrative begins to fall apart, showcasing the brutal violence meted out by Imperial forces against those who resist Palpatine’s rule. Series creator Tony Gilroy and star Diego Luna gave more context about expounding on a k

Pinterest is adding third-party influencer content to its feeds

is platforms and communities reporter with five years of experience covering the companies that shape technology and the people who use their tools. Influencers on affiliate shopping platform LTK may soon get access to a huge new audience: Pinterest users. Under a new partnership announced today, high-performing image posts on LTK will automatically be cross-posted to Pinterest; the pilot program is expected to expand in the coming months to more creators and content formats. LTK is a huge par

Anduril CEO Palmer Luckey says the defense tech company will 'definitely' go public

Defense tech startup Anduril Industries will go public, founder and CEO Palmer Luckey said Tuesday. "We are definitely going to be a publicly traded company," he told CNBC's "Closing Bell: Overtime." "We are running this company to be the shape of a publicly traded company." He added that there isn't "really a path" for a company like Anduril to win significant trillion-dollar defense contracts without going public. Luckey did not detail an IPO timeline. Since its founding, Anduril has risen

I tested an AI-powered glucose monitor against a traditional monitor for two weeks. Here's my verdict

ZDNET's key takeaways The Stelo by Dexcom is an over-the-counter continuous glucose monitor that uses sensors to track glucose levels and export data to your smartphone. The app utilizes generative AI to provide lifestyle recommendations and share data with your healthcare provider. However, it needs needs additional features in future iterations to offer a more comprehensive experience. $99 at Amazon I was diagnosed as prediabetic and insulin resistant during middle school, and ever since, I

These Are the Best TV Shows on Apple TV Plus That'll Scratch Your Sci-Fi Itch

You'd be mistaken if you think Severance is the only must-watch sci-fi TV show on Apple TV Plus. Apple's original entertainment platform has steadily churned out top-notch genre titles for years. Finally, audiences are discovering what you and I have known for a while. The problem with Apple TV Plus is that its library is packed with high-quality programs, and it can be confusing to determine which one to click play on first. But that won't discourage you. How do I know? You could've gone to Ne

Topics: apple plus sci series tv

The Sonos Era 300 is $90 off in this home speaker sale

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 . A number of Sonos speakers are on sale right now at Sonos direct and Amazon. his includes the well-regarded Era 300 smart speaker, which is on sale for $359. This particular model is one of Sonos' newest, and it has rarely gone on sale in the past. We enjoyed the Era 300 enough to giv

Bose’s New Bluetooth Speaker Looks Like a Solid Way to Annoy Everybody at the Beach

The only thing I love more than foisting my music on other people at the park is doing it with a speaker that delivers solid or above-average sound quality. While I haven’t had a chance to use Bose’s new portable Bluetooth speaker, it seems like it could be a great option for doing just that. Bose’s SoundLink Plus is a midrange Bluetooth speaker that is very clearly designed for outdoor excursions since it can float and has an IP67 rating that makes it damn near waterproof and dustproof. Per Bo

Snapchat’s latest subscription tier will get you ‘hundreds’ of lenses

is a news writer who covers the streaming wars, consumer tech, crypto, social media, and much more. Previously, she was a writer and editor at MUO. Snapchat has launched a new subscription tier that offers access to a wider selection of lenses and augmented-reality experiences. The Lens Plus subscription costs $8.99 per month and will include lenses made by Snapchat and “select” creators to start, such as an exclusive AI-powered video lens and a Bitmoji game lens. Along with access to “hundred

The best Chromebook you can buy in 2025

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 . Whether you’re shopping for a budget-friendly laptop for school or a sleek machine for everyday productivity, the best Chromebooks can offer surprising functionality for the price. Chromebooks have come a long way from their early days as web-only devices. Now, many Chromebook models f