
A claim by OpenAI to have discovered a mathematically faster Fast Fourier Transform is far less impressive than it seems, a mathematician explains. CC-licensed photo by fotodiagramas on Flickr.
You can sign up to receive each day’s Start Up post by email. You’ll need to click a confirmation link, so no spam.
A selection of 9 links for you. Summed up. I’m @charlesarthur on Twitter. On Threads: charles_arthur. On Mastodon: https://newsie.social/@charlesarthur. On Bluesky: @charlesarthur.bsky.social. Observations and links welcome.
They war-gamed dimming the Sun. It went even worse than you think • WIRED via Ars Technica
Karl Mathiesen:
»
When it comes to deciding the fate of the planet, Colleen Golja always thought science and reason would have a seat at the table. That was until one morning last September in London, when the climate researcher took part in the first in a series of war games. The goal: to prevent an uncontrolled global race to develop a technology aimed at cooling the planet but that comes with vast, unknown risks that could reshape life on Earth.
“I thought that would be such an easy thing. Like, we can all agree to do ethical research and make sure it’s for the better of all humans,” she told WIRED. “And boy, was I wrong.”
The simulation, titled Exploring Geopolitical Tipping Points and Climate Cooling Strategies, saw a couple dozen foreign-relations experts, scientists, military personnel, and former government officials from across the world convene in a meeting room at Queen Mary University of London. After making introductions over coffee and little yogurts, they sat at tables arranged in a square with the name of the country or organization each person was playing: national governments, climate NGOs and nonprofits, indigenous groups, and tech companies. Golja was assigned to provide technical advice to help participants make scientifically literate decisions.
…As in real life, no one knew all the facts, and players had to respond to events that were bringing the world closer to a full-scale attempt at deploying solar geoengineering tech, even when they may not have a full picture of what had truly occurred—or what any of the others were up to.
The first session set the tone. Distrust and disinformation dominated. As participants discussed rules governing outdoor experiments in an attempt to agree an international deal, players representing both the US and China told the group they could not sign a deal that constrained their pursuit of research considered to be in their “national interest.” Nor could they accept a deal that would see their superpower rival taking the lead technologically. Speaking to WIRED, Jeffrey Nielsen, a major in the US Army who played the role of a US national security attaché, summarized the position as “worse than no deal at all is any deal that favors China.”
Tensions escalated when the team running the simulation handed the Russian delegates an “intelligence report” indicating they had found a plane near the Bering Strait believed to be involved in a US geoengineering research program. The US team—which was indeed flying research missions—accused Russia of disinformation.
Meanwhile, the US became convinced China was also conducting research and developing its own program. Beijing’s representatives had tried to insert language into a mooted deal that would ensure no retroactive punishment for past experiments. Then, China approached a player representing SpaceX to float the idea of a technology-sharing program. In a private discussion away from the group, the SpaceX player immediately reported the Chinese approach to the US team. The US demanded an international investigation. The finger-pointing continued, and countries abandoned the talks.
«
Fascinating read about how national tensions and mutual suspicions would derail attempts to do the right thing.
unique link to this extract
I tried out Apple’s HomeView smart display • The Verge
Jennifer Pattison Tuohy:
»
The first thing that struck me about the HomeView was its size. It’s much smaller than I expected, and the screen almost entirely hides the small aluminum base that acts as a speaker. The Liquid Retina display is bright and responsive to touch, and it displays photos and the HomeView “faces” brilliantly.
You can swipe to change faces easily and choose from dozens of options, most of which resemble Apple Watch faces. The display feels like a giant Apple Watch paired with the functionality of an iPhone and the room to breathe of an iPad.
Apple offers both a wall-mounted and tabletop version of the HomeView, and the wall-mounted model looks like it will make a great smart home controller.
A dedicated Home Widget face pulls devices from the Apple Home app; I could walk up and tap to control a thermostat and door lock and activate a scene, or I could swipe right to get a live view of HomeKit Secure Video cameras and tap into one to access nearby accessories, such as opening the garage door. When I tried to unlock a door, it stopped me, asking me to authenticate with my face or iPhone.
The Home Widget is a skin of the Home app, so it offers all the controls you have with that app on your iPhone, just on a bigger screen designed for walk-up-and-tap interaction.
There’s a lot of swiping on the HomeView. Swipe left to get to new home faces, tap widgets to access deeper controls in apps, then swipe right for more features. You swipe up to return to the main screen, then up again to access the onboard apps, which automatically populate from your phone. Swiping down from the top of the screen brings up a control center, just like on an iPhone. You can even enable the 12MP camera from here, giving you a de facto mirror.
«
Basically this $299 (£299 in the UK!) device is a big Apple Watch: it does very little on its own. Mostly it’s handing off from the phone (so an Apple Watch isn’t enough to unlock it). It can’t natively play Apple TV content (and anyway that would look weird on the 4:3 display). It needs a USB-C power source (no batteries), so good luck not tangling with the power cord in your kitchen.
Honestly, a great product for 2016. Today? Multiple companies have tried home products with screens, and they’ve all got nowhere.
Also released on Tuesday: an Apple TV – the set-top box – for $300. You can buy a proper TV for that amount in the US.
unique link to this extract
How many shots are in the average movie today? • Stephen Follows
Stephen Follows:
»
Last night I had the absolute pleasure of watching American Graffiti (1973) at the ActOne Cinema in Acton, and then listening to Mark Kermode quiz Walter Murch about how he built its sound.
Murch edited Apocalypse Now and The English Patient, and he wrote In the Blink of an Eye, which is probably the best book there is on film editing. (On American Graffiti he did the sound, and the picture was cut by Verna Fields and Marcia Lucas).
After the session, the three of us chatted, and as Mark had read an advance copy of my article below, he asked Walter to guess how many shots were in American Graffiti. Walter’s guess was 952. Was he right?
Let’s go down the rabbit hole of editing and find out!
“How many shots are there in the average movie?” is a very common question I get asked. So today I’m sharing the results of my studies into the shot counts of 8,770 feature films released between 1930 and 2025. By the way, some people might say ‘shots’ others may say ‘cuts’. It’s the same thing, in that a sequence with six shots has five cuts between them. Everyone seems to (in some cases strongly) prefer one over another, but whatever we call them, we’re describing the same thing.
How many shots does a typical film have now?
The most commonly quoted industry rule of thumb comes from editor Vashi Nedomansky, who says the average film has around 1,250 shots, and blockbusters often have more than 3,000. His 1,250 is actually a little low for today’s releases, but his 3,000 is about right for the biggest of them.
The typical film released between 2017 and 2025 has 1,535 shots. That’s the median (i.e., the film in the middle of the pack), whereas the mean is slightly higher (1,603) because a handful of films with very high shot counts pull up the average.
At a typical length of 111 minutes, that works out to roughly one new shot every four seconds once we take the end credits off.
There’s a wide spread around that, as a tenth of recent films have fewer than 770 shots and a tenth have more than 2,460. Put another way, four in five recent films have more than 1,000 shots, and one in four has more than 2,000.
«
No doubt one of the films that pulls the number higher is Taken 3, which famously uses 14 cuts in six seconds for Liam Neeson looping over a wire fence.
unique link to this extract
Revolut data breach exposes customers’ passport copies and full transaction histories to hackers • Cyber Security News
Guru Baran:
»
Revolut has disclosed a data-security incident in which sensitive customer information was released after the financial technology company received a fraudulent request that appeared to originate from a legitimate government agency. Here is the detailed breach report.
The incident reportedly exposed highly sensitive Know Your Customer (KYC) documentation and detailed financial records belonging to a limited number of users, including passport or driver’s license copies, identity-verification selfies, account statements, and complete transaction histories that included Bitcoin-related activity.
According to Revolut’s explanation, the disclosure did not result from a compromise of its core systems, mobile application, or customer accounts. Instead, the company said it was targeted through a sophisticated impersonation operation involving an unauthorized email account operating under an official government agency’s email domain.
Because the message carried valid domain-authentication credentials, Revolut believed it was handling an authentic legal or government information request and fulfilled it.
The response provided extensive information. It included customers’ full names, dates of birth, occupations, postal addresses, email addresses, and telephone numbers.
The exposed document and verification data reportedly included copies of identity documents, such as passports and driving licenses, along with facial-verification images submitted during onboarding.
«
This happened in September. Today on X there was a post from someone who said they had been attacked in their home and had their crypto stolen (via the “beat him up until he gives up his password” method of cracking passwords). He says $800,000 worth of crypto stolen. Big if true. And a warning to anyone who was with Revolut.
unique link to this extract
OpenAI employee arrested after recording device found in office • The Guardian
Maya Yang:
»
OpenAI said it has found a hidden recording device in one of its offices and has referred the matter to the FBI. One of its employees has been arrested.
In a statement on Tuesday, the San Francisco-based AI company said it discovered the “sophisticated recording device” and used one of its “models to understand the device and where it had come from”.
The company has identified “that a specific employee had planted it a few days earlier”, adding: “At this time, we have no indications of this individual inappropriately accessing or exfiltrating model weights, source code, or customer data. The employee was terminated.”
The employee in question has been arrested, according to the company. OpenAI did not disclose details on how its models were used to identify the employee or which office the device was discovered in.
OpenAI said that it is “grateful to the agents and prosecutors who moved quickly to make an arrest” and the investigation is continuing.
The company added: “We take protecting our technology, data, and people seriously, and as a matter of national importance. Our security program is designed to protect against a wide range of threat actors, from insider risks to cybercriminals to nation states, and this case is an example of how AI can help address these sophisticated security threats.”
«
Well of course it used its software to figure out what the device was. (Even if it didn’t.) What’s very weird here is the motive, which we have to hope will come out in the fullness of time.
unique link to this extract
AI coding agents generate more code, but not more software • Ars Technica
Kyle Orland:
»
Anyone who has even tangentially associated with computer programming knows that modern AI coding assistants and agents can be incredibly efficient at generating huge amounts of functional code. But coders making use of those tools also know better than to trust the accuracy of that code, meaning substantial effort needs to be spent reviewing any AI-generated output.
A recent study of actual coding practices across hundreds of firms finds that human code review forms a significant “bottleneck” for the overall efficiency of AI coding tools, resulting in “little evidence that firms increase software output or reduce employment” by using them. Any efficiency increased during the actual coding phase, the study authors find, is “absorbed by downstream constraints in the production process”; as “the code review process significantly increases in length, pull requests are more likely to require revisions, and reviewers leave more comments.”
To come to these conclusions, Harvard University researchers Fiona Chen and James Stratton made use of aggregated analytics data from Jellyfish, which measures the granular output of engineering teams. That data encompasses 300 million individual “work events” (e.g., commits and pull requests) and issue management software data across more than 700,000 employees at over 700 relevant software development firms from 2021 through March of 2026.
«
Not surprising; there’s a general principle that more code means more bugs, and it’s not certain that coding agents aren’t as vulnerable as humans to errors, given that they’re trained on code written by humans.
unique link to this extract
Apple has far-reaching plans to block hundreds of programmatic data companies from iOS • AdExchanger
James Hercher:
»
At the end of September, AdExchanger reported that Apple’s iOS 27 update [then two weeks ago] quietly blocked a handful of programmatic data players – including The Trade Desk and its Unified ID 2.0 initiative, LiveRamp, ID5, Permutive and Audigent – from collecting data or serving ads on Safari. (They were also blocked on other mobile browsers [on iOS], since browsers must use WebKit to launch on Apple devices.)
Now, according to two sources with direct knowledge of the WebKit updates, the initial list has been scrapped in favour of an expansive library of hundreds of CDPs, ad tech and mar tech companies, data sellers and ID graph operators.
These companies will exist in a purgatorial state of potential exclusion from advertising to or accessing people on Apple phones and computers, according to the sources. And only Apple seems to know what will get an ad tech vendor blocked or unblocked.
The full list of potentially blocked companies exists in a private GitHub repo, so it cannot be observed without access. One person with access to the full list did briefly allow AdExchanger to observe the list and read names off of it, but would not share it or allow it to be documented.
…The sources who spoke to AdExchanger said Apple’s original list of blocked ad tech and data vendors is now moot, having been replaced by a longer list of companies that can be dynamically blocked by Apple.
The new dynamic process that WebKit uses to identify and block vendors relies on a remote list that Apple devices regularly call upon. Previously, Apple would need to roll out a new version of iOS to add or remove vendors from its list of blocked companies; now, it can just happen on the fly.
And vendors may not even be aware that they have been added to the list, or whether they have graduated from the intermediary “potentially blocked” list to being actively blocked.
«
Interesting if true; the problem is that nobody is confirming it.
unique link to this extract
Faster Fourier Transforms • arg min
Ben Recht:
»
Since the invention of the Fast Fourier Transform (FFT) [in 1965], people have looked for even faster Fourier transforms. One question is just how fast you can go. It seems like you probably need at least n operations to compute the FFT, as it takes n steps just to write it down. The FFT is 5*log2(n) times slower than that reasonable speed limit, and that 5*log2(n) factor can be big. It’s 200 when n is a trillion. Can you do something clever to reduce that prefactor of 200?
Well, lo and behold, in the massive paper dump OpenAI took on the mathematics world last week, they claim to have a faster Fourier transform. The main claim from their discriminatively named “main.pdf” is:
We give a deterministic algorithm that computes the discrete Fourier transform at every length n in O(n(log n)^1-10^-13) operations. The model uses exact complex arithmetic, unrestricted coefficients, specified Fourier roots, and unit-cost logarithmic-size indexing; scalar preparation and array organization are included.I was intrigued about what was going on here. The log(n) term, in theory, was a teeny tiny bit smaller than in the standard FFT.
Did I read this paper? Of course not. No one at OpenAI read this paper either, so why should I? I did what every other mathematician in the world does with AI slop mathematics: I fed it back into the slop machine and ran an information retrieval session with a chatbot interface to extract salient facts. Anthropomorphically speaking: I asked ChatGPT what it thinks about its own output. This is how we do mathematical research now. What a world.
Unfortunately, I did not find a faster Fourier transform. Instead,l I found the rot that develops inside applied mathematical theory when formalism becomes so detached from reality that a “breakthrough” is nothing more than an artifact of mathematicians not being able to properly specify the rules of their games in natural language.
«
Basically: it’s only useful if your computer can store arbitrarily large numbers with unerring accuracy, and even then it’s only going to be faster than the standard FFT if you’re working on colossally large amounts of data.
unique link to this extract
Character.AI files for bankruptcy, to sell some assets to Disney for $20m • Reuters
Anzar Mehraj and Rhea Rose Abraham:
»
Chatbot platform Character.AI said on Monday it has filed for bankruptcy in the US and has agreed to sell some assets for $20m to Walt Disney.
The generative AI platform has faced mounting legal challenges over its chatbots. Earlier this year, Character.AI and Alphabet’s Google settled a lawsuit by the mother of a 14-year-old Florida boy who killed himself after the startup’s chatbot allegedly encouraged him to do so.
Kentucky has sued the company, saying its chatbots encouraged users to cut, starve or kill themselves, while Pennsylvania filed a lawsuit alleging its chatbots posed as doctors.
According to Character.AI’s proposal, Disney will be a “stalking-horse” bidder — an initial prospective buyer — for a non-exclusive perpetual license to some intellectual property. Other bidders can top Disney’s offer.
Character.AI expects to close the sale of all its assets by late November or early December. Character Technologies, its US-based owner, listed estimated assets and liabilities of between $50m and $100m, according to a court filing.
Disney will help the platform in the transition, using staff it has hired from Character.AI. The platform’s services would continue meanwhile, but would be shut down if it can’t find a buyer, the company said.
Two former Google employees founded Character.AI in 2021. In 2024, Google licensed its technology and rehired the founders.
«
An early sign of the bubble popping, or just roadkill?
unique link to this extract
| • Why do social networks drive us a little mad? • Why does angry content seem to dominate what we see? • How much of a role do algorithms play in affecting what we see and do online? • What can we do about it? • Did Facebook have any inkling of what was coming in Myanmar in 2016? Read Social Warming, my latest book, and find answers – and more. |
Errata, corrigenda and ai no corrida: none notified








