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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

Anker 5-in-1 USB-C Hub Just Dropped to Almost Free, Limited Stock Available on Amazon

If you’ve ever found yourself flipping your laptop over and over looking for a USB port that just doesn’t exist anymore, you’re not alone. Laptops keep getting thinner, and ports keep disappearing. But that doesn’t mean you won’t be able to use them at all anymore. You just need to get smarter about it. And luckily, there are products out there meant to help you do this so you can take full advantage of all the connections your laptop or Chromebook can support. And there’s a deal on one right no

Topics: hub just laptop right usb

Got a Nintendo Switch 2? Here's the Right Way to Move Your Games and Data

A system transfer from the original Switch to the Switch 2 is supposed to be easy, and it is. However, there are a few tricks in the process that some Switch 2 owners have tripped over since buying the new portable console. If you have both an original Switch and a Switch 2, Nintendo added a System Transfer tool that moves over your profiles, purchased games, save data and other settings. This option shows up when starting up the Switch 2 for the first time, but if certain instructions aren't f

Tesla Drivers Sue Elon Musk for Turning Their Cars Into "Extreme" Right-Wing Symbols

"Tesla branded vehicles have become strong political symbols and now appear to be veritable extreme-right 'totems.'" The Implications Tesla drivers in France are suing Elon Musk's EV maker for turning their vehicles into what they characterize as "extreme-right" symbols. As news agency France 24 reports, the owners are demanding that their lease contracts be terminated and reimbursed for the accrued legal costs. "Because of Elon Musk's actions... Tesla branded vehicles have become strong pol

Engineer creates first custom motherboard for 1990s PlayStation console

Last week, electronics engineer Lorentio Brodesco announced the completion of a mock-up for nsOne, reportedly the first custom PlayStation 1 motherboard created outside of Sony in the console's 30-year history. The fully functional board accepts original PlayStation 1 chips and fits directly into the original console case, marking a milestone in reverse-engineering for the classic console released in 1994. Brodesco's motherboard isn't an emulator or FPGA-based re-creation—it's a genuine circuit

Apple Execs Get Seriously Flustered Trying to Explain the Company's Dismal AI Failure

Apple is facing some intense scrutiny after yet again flubbing its AI tech. During the company's Worldwide Developers Conference on Tuesday, the company showed off its latest vision for "Apple Intelligence," a suite of tools that use machine learning to scan images for objects or smush emojis together to form custom Franken-reacts — cutesy ideas that fall vastly short of the ambition of competitors in the space like OpenAI. The Wall Street Journal's Joanna Stern sat down with Apple's software

Switch 2 size comparison: Nintendo’s latest up next to a whole lot of consoles

is a reviewer covering laptops and the occasional gadget. He spent over 15 years in the photography industry before joining The Verge as a deals writer in 2021. Nintendo’s Switch 2 is faster, more powerful, and all around better than its predecessor in just about every way. It’s also bigger than the OG Switch. But, like, how much bigger? Okay, sure, we can check the specs and see that the Switch 2 is half an inch (12.7mm) taller and 1.2 inches (30.48mm) wider than the original — and it’s 0.22

Nintendo Switch 2 Blows Past Records to Sell 3.5 Million Consoles in Just 4 Days

We knew it was highly anticipated, but Nintendo on Wednesday confirmed that its new Switch 2 handheld game console has sold more than 3.5 million units worldwide within the first four days of release. This makes it the fastest-selling Nintendo device ever, flying past other releases like the original Switch, which by comparison sold 2.74 million units in its first month. The Nintendo Switch 2 launched at a price of $450 for the standard America version of the console, which has yet to be affect

Pixel phones may finally get native flashlight brightness controls, years after Samsung and Apple

Mishaal Rahman / Android Authority TL;DR Google may add native flashlight brightness controls to Pixel phones in the next quarterly release of Android 16. While the hardware has long supported it, Pixel users currently need to use an app to adjust the flashlight’s intensity. The new feature, discovered in the latest beta, will likely make the Quick Settings flashlight tile expandable. Nearly every smartphone has an LED flash on the rear that you can use as a flashlight in a pinch, but most d

Inexpensive AI Agents Threaten Entry-Level Coding Jobs

In 2007, Luke Arrigoni, an AI entrepreneur, earned $63,000 at his first job as a junior software developer. Today, he says AI tools that write better code than he did back then cost just $120 annually. The numbers don’t sit right with him. Arrigoni, who runs Loti AI, a company that helps Hollywood stars find unauthorized deepfakes, worries that underpriced AI tools encourage companies to eliminate entry-level roles. He wants to flip the incentive structure so people’s careers don’t end before t

Craig Federighi explains why it took so long to make the iPad more Mac-like

iPadOS 26 arguably brings the biggest update to the iPad ever seen, turning it into something much more Mac-like in both UI and capabilities. But since iPads have been using the same chips as Macs since 2021, why did it take so long? That’s the question Apple’s software head Craig Federighi sets out to answer in a new interview … iPadOS 26 is so ground-breaking that I argued Apple has finally turned the device into something worthy of the term ‘computer.’ The biggest change by far is proper w

AI Agents Are Too Cheap for Our Own Good

In 2007, Luke Arrigoni, an AI entrepreneur, earned $63,000 at his first job as a junior software developer. Today, he says AI tools that write better code than he did back then cost just $120 annually. The numbers don’t sit right with him. Arrigoni, who runs Loti AI, a company that helps Hollywood stars find unauthorized deepfakes, worries that underpriced AI tools encourage companies to eliminate entry-level roles. He wants to flip the incentive structure so people’s careers don’t end before t

Disney and Universal sue AI image company Midjourney for unlicensed use of Star Wars, The Simpsons and more

The Walt Disney logo is displayed on screen during the Walt Disney Studios presentation at The Colosseum at Caesars Palace at CinemaCon 2025 in Las Vegas, Nevada, on April 3, 2025. Disney and Universal joined forces in a lawsuit against artificial intelligence image creator Midjourney, alleging copyright infringement. It is the first AI copyright lawsuit from Hollywood giants. The lawsuit claims that the company used and distributed AI-generated characters from the movie studios like Star War

"Piracy Is Piracy": Disney Sues Midjourney for Massive Copyright Violation

Disney and NBCUniversal — a pair of media behemoths behind franchises ranging from "Star Wars" and "Toy Story" to "Minions" and "Shrek" — are suing AI company Midjourney, accusing it of enabling copyright infringement on a massive scale through its AI image generator tech. In the lawsuit, which was filed in a California district court today, the two Hollywood juggernauts accused the firm of ignoring its previous requests to stop violating their intellectual property rights. "Midjourney is the

Apple explains Siri delays, teases more new features are coming

During its WWDC keynote, Apple addressed one big elephant in the room: Siri’s delayed features that were announced last year but never shipped. And now in a new interview, Siri’s recently-appointed boss Craig Federighi has explained more of the reasoning behind the delay, and teased even more new features are coming. Craig Federighi promises Apple will ship every Siri feature previously announced ‘and more’ Craig Federighi is Apple’s software chief, and as such tends to get a lot of PR time du

Disney and Universal Studios file suit against Midjourney for copyright infringement

Disney and NBCUniversal have filed a joint suit against AI company Midjourney alleging copyright infringement on their various properties. The complaint, filed in federal district court in Los Angeles, includes images created by Midjourney that feature a wide variety of protected characters from each company’s various properties, including Star Wars, Shrek, The Simpsons, Despicable Me and others. The 110-page suit alleges that the AI company “helped itself to countless” copyrighted works when tr

Apple made a haptic trailer for the F1 movie that only works on iPhones

It 'lets you feel the action of the film right in your hands.' The long-anticipated F1 film comes to theaters on June 27 . To celebrate the pending release, Apple has developed a haptic trailer exclusively for iPhones. This leverages the smartphone's Taptic Engine to let people "feel the action" right in the palm of their hands. Apple promises that viewers will "experience the power of the engines, the rumble of the curbs, and the intensity of every gear shift like never before with responsive

Topics: apple f1 film hands right

Best Outdoor Projector for 2025: Tested by Our Experts

CNET staff -- not advertisers, partners or business interests -- determine how we review products and services. If you buy through our links, we may earn a commission. The best outdoor projectors can create the ultimate backyard movie night. You can watch movies on Netflix, Disney Plus, Amazon Prime Video or videos on YouTube while camping in the wild or behind your house. All you need is one of these projectors and a flat -- or flat-ish -- surface for an instant movie theater. Portable, batter

Hollywood studios target AI image generator in copyright lawsuit

On Wednesday, Disney and NBCUniversal filed a lawsuit against AI image-synthesis company Midjourney, accusing the company of copyright infringement for allowing users to create images of characters like Darth Vader and Shrek, reports The Hollywood Reporter. The complaint, filed in US District Court in Los Angeles, marks the first major legal action by Hollywood studios against a generative AI company. Midjourney is a subscription image-synthesis service and community that allows its users to su

Apple’s Craig Federighi on the long road to the iPad’s Mac-like multitasking

CUPERTINO, Calif.—When Apple Senior Vice President of Software Engineering Craig Federighi introduced the new multitasking UI in iPadOS 26 at the company's Worldwide Developers Conference this week, he did it the same way he introduced the Calculator app for the iPad last year, or timers in the iPad's Clock app the year before—with a hint of sarcasm. "Wow," Federighi enthuses in a lightly exaggerated tone about an hour and 19 minutes into a 90-minute presentation. "More windows, a pointier poin

Google Chrome disables uBlock Origin for some in Manifest v3 rollout

Google continues its rollout of gradually disabling uBlock Origin and other Manifest V2-based extensions in the Chrome web browser as part of its efforts to push users to Manifest V3-based extensions. For those unaware, Manifest V3 is Chrome's latest extension specification and is designed to limit extension access to user network requests, block developers from utilizing remote content, and improve overall performance. While Manifest V3 is supposed to benefit end users, it comes at the cost o

Richard Feynman's blackboard at the time of his death (1988)

These digitized collections are accessible for purposes of education and research. Due to the nature of archival collections, archivists at the Caltech Archives and Special Collections are not always able to identify copyright and rights of privacy, publicity, or trademark. We are eager to hear from any rights holders, so that we may obtain accurate information. Upon request, we’ll remove material from public view while we address a rights issue.

All the news about EV charging in the US

The state of electric vehicle charging in North America is shaping up like the smartphone charging wars — but focused on much more expensive hardware. Right now, like USB-C and Android phones, the Combined Charging System (CCS, Type 1) plug is on a greater variety of cars. Meanwhile, Tesla’s plug was long compared to Apple and Lightning. But while Apple eventually adopted USB-C, Tesla is opening up its connector, renaming it the North American Charging Standard (NACS), and trying to shove CCS o

Three reasons every founder and VC should be at TechCrunch All Stage 2025

From idea to IPO — where are you on your startup journey? Are you a pre-seed founder seeking your next VC investment? A late-stage startup preparing to go public? Still in the idea phase and looking for insights to bring your vision to life? Or are you a VC eager to back the next breakthrough innovation? If any of that sounds like you — or if you’re in between stages and ready to level up — TechCrunch All Stage 2025 (formerly Early Stage) is the place to be. Join 1,200 founders to exchange

Apple emerges as likely buyer for UFO disclosure film from ‘Top Gun’ producer

If aliens exist, Apple may be about to tell the origin story of how we found out… Deadline exclusively reports that Apple Original Films is the likely suitor for an upcoming movie centered around UFO disclosure. The untitled sci-fi (fiction, debatable) film is expected to focus on events in recent years around the U.S. government’s disclosure of previously classified footage of what is now called a UAP (unidentified aerial phenomena or unidentified anomalous phenomena). For years, the stigma su

Lenovo Legion Go S review (Windows version): Not so fast

Lenovo has already teased the second-gen version of its flagship gaming handheld. But that won’t be out until much later this year, so in the meantime, it’s come out with the Legion Go S, a slightly sturdier and more portable way to frag while you’re out and about. Now the tricky thing about this device is that it will be available in a bunch of different configurations including one that comes pre-installed with SteamOS — a first for any portable PC not made by Valve. Frankly, that’s the versio

Study of TikTok, X ‘For You’ feeds in Germany finds far-right political bias ahead of federal elections

Recommendation algorithms operated by social media giants TikTok and X have shown evidence of substantial far-right political bias in Germany ahead of a federal election that takes place Sunday, according to new research carried out by Global Witness. The non-government organization (NGO) undertook an analysis of social media content displayed to new users via algorithmically sorted “For You” feeds — finding both platforms skewed heavily toward amplifying content that favors the far-right AfD p