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Mathematical Illustrations: A Manual of Geometry and PostScript

This manual has been available on this site since about 1996, with improvements taking place frequently. The current version has been published as a book of about 350 pages by Cambridge University Press. By agreement with the Press, however, it will remain posted on this web site. Many improvements in the current version over previous ones are due to the (anonymous) referees of the Press, whom I wish to thank heartily. I also wish to thank Lauren Cowles, of the New York office of the Press, for

Benzene at 200

In 1825, Michael Faraday discovered one of the most fascinating compounds in chemistry: benzene. While isolating the components of oily residues of illuminating gas, Faraday identified a mysterious liquid, with a peculiar aromatic smell, which would go on to transform the landscape of chemistry. Within the pages of the Philosophical Transactions of the Royal Society of London, Faraday described this seemingly simple yet profoundly unique molecule. What set benzene apart, even in its earliest di

AMD unveils 2nm Epyc Venice with 256 cores for next-gen AI and cloud workloads

What just happened? AMD is preparing to shake up the data center landscape with its forthcoming Epyc Venice processor, a chip that promises to set new standards for performance and scalability in server computing. Announced at the company's recent Advancing AI event, the Venice CPU is built on AMD's next-generation Zen 6 architecture and is slated for release in 2026, targeting the ever-increasing demands of artificial intelligence, cloud computing, and high-performance analytics. Venice makes

German government moves closer to ditching Microsoft: "We're done with Teams!"

Serving tech enthusiasts for over 25 years.TechSpot means tech analysis and advice you can trust In brief: The long-running battle of Germany's northernmost state, Schleswig-Holstein, to make a complete switch from Microsoft software to open-source alternatives looks close to an end. Many government operatives will permanently wave goodbye to the likes of Teams, Word, Excel, and Outlook in the next three months in a move to ensure independence, sustainability, and security. Plans to go open-so

From Hello Barbie to ChatGPT: Mattel is bringing OpenAI's tech to children's toys

Not the Children: Life in plastic may be fantastic, but a touch of AI and chatbots can make even a child's toy better in today's market. Mattel seems convinced it can bring language models to a wider – and younger – audience, though its previous attempts with AI ended in an absolute privacy and security disaster. Mattel recently announced a new partnership with OpenAI, anticipating a major infusion of AI and chatbot services into its upcoming products. The world's second-largest toy maker (afte

The JBL Xtreme 3 Portable Speaker Hits New Low Price of the Year, Even Beats Black Friday

Is it BBQ season or party season? We reckon that likely comes down to how old you are, but we also reckon it can be both at the same time. There’s space for all manner of outdoor gatherings here, so why not make the most of them? If you’re looking for a way to make them feel a little more special though, then we recommend getting this JBL Xtreme 3 portable Bluetooth speaker. See at Amazon While this impressive speaker would normally set you back $330, thanks to a limited-time deal on Amazon, i

AMD unveils Epyc Venice with 256 cores and 2nm process for next-gen AI and cloud workloads

What just happened? AMD is preparing to shake up the data center landscape with its forthcoming Epyc Venice processor, a chip that promises to set new standards for performance and scalability in server computing. Announced at the company's recent Advancing AI event, the Venice CPU is built on AMD's next-generation Zen 6 architecture and is slated for release in 2026, targeting the ever-increasing demands of artificial intelligence, cloud computing, and high-performance analytics. Venice makes

Musk's Daring Gambit Has Managed to Do Something Remarkable: Alienate Democrats AND Republicans

It appears that Elon Musk has seriously overestimated his sustained popularity among his right-wing fans. In another masterful display of cunning, the world's richest man turned coat and viciously lashed out at his former best-friend-in-chief Donald Trump this month. It was a very public affair, as both parties traded blows over social media — and Trump at his many press conferences — but it was Musk who came out looking worse for wear, unable to equal the president's threats, squirming at the

iOS 26 SDK offers strongest hint yet at a foldable iPhone

Apple’s WWDC sessions usually offer a mix of developer guidance and subtle hardware tea leaves. And last week, one passing comment during the explanation of an SDK change caught attention for what it might suggest about a particular future device. In a session called “Make your UIKit app more flexible,” Apple confirmed that starting with the iOS 26 SDK, apps will no longer be automatically letterboxed or scaled on new screen sizes when running on future hardware. Historically, when Apple intro

How the BIC Cristal ballpoint pen became ubiquitous

If you want to see a tour de force of mod­ern tech­nol­o­gy and design, there’s no need to vis­it a Sil­i­con Val­ley show­room. Just feel around your desk for a few moments, and soon­er or lat­er you’ll lay a hand on it: the BIC Cristal ball­point pen, which is described in the Pri­mal Space video above as “pos­si­bly the most suc­cess­ful prod­uct ever made.” Not long after its intro­duc­tion in 1950, the Cristal became ubiq­ui­tous around the world, so ide­al­ly did it suit human needs at a p

Topics: ed er ing ly pen

Acefast Acefit Air Review: Sleek Style, Solid Substance

In the swelling tide of open earbuds, it can be easy to overlook an underdog. When Acefast’s Acefit Air first came to my attention, they seemed like any other pair of budget ear hooks, the baseline design for buds that let you listen to tunes while keeping your ears open to the world. I was delightfully surprised once I got them out of the box, starting with their spyware-thin charging case harboring stylishly slim buds with a touch of metallic flair. The Acefit Air’s daily performance is simil

Trying out Nvidia’s RTX 50 Series GPU on a Falcon Northwest gaming PC | review

Kelt Reeves has been creating custom gaming PCs since 1992. Before he got out of college, Reeves started Falcon Northwest in Medford, Oregon, and it’s cranking out gaming PCs with the polish of a small company. I have interviewed Reeves over the years and used a number of his machines. I saw him again on a sad occasion at the memorial service for Gordon Mah Ung, one of the original and finest gaming hardware reviewers. I tried out a Falcon Northwest machine back in 2019, and I used the Falcon

ChatGPT Plus Review: A Feature-Rich AI Chatbot That's Great for Research

CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise. 9.0 / 10 SCORE ChatGPT Plus Review Pros Very accurate Powerful reasoning models that are great for research Voice mode for long chats Long-term memory Robust image generation Document and image analysis Custom GPT creation Suite of tools for more niche tasks Cons Can still hallucinate ChatGPT has completely changed how I do my job. Over the past ye

This Historian Has Seen the Future of Trans Health Care

Jules Gill-Peterson is speaking to me from the future. She’s 11 hours ahead of me when I reach her over Zoom. While I’m sniffling and congested on a rainy Wednesday evening on my side of the screen in Brooklyn, Jules is welcoming the sun on a beautiful Thursday morning, the bright blue sky of Bangkok peeking in from the window behind her. The Baltimore-based trans studies scholar is known for her work on the history of medical transition, specifically the history of how trans kids have attempte

I tried replacing Google Search with Perplexity. It didn’t go well

Joe Maring / Android Authority It’s no secret that Google Search is in a weird place right now. The regular search experience has seen better days, with ads and unhelpful results making the search engine feel far less helpful than it was a few years ago. Meanwhile, artificial intelligence features like AI Overviews and AI Mode aren’t where they need to be. Despite its imperfections, Google Search has remained my go-to search engine. But why should it when there are so many other options out th

Yet another European government is ditching Microsoft for Linux - here's why

querbeet/Getty Images "We're done with Teams!" declared Digitalisation Minister Dirk Schrödter, speaking via an open-source video platform, in his announcement that the German state of Schleswig-Holstein will phase out all Microsoft software from government workplaces. The goal is to fully transition from Microsoft programs to Linux and open-source programs within the next three months. Also: I found a Linux distro that combines the best parts of other operating systems (and it works) The dec

I replaced my Kindle and iPad within hours of testing this tablet - and didn't regret it

ZDNET's key takeaways The TCL Tab 10 Nxtpaper 5G is a full-color, color paper, and ink paper tablet available at Verizon for $239. It's a great entertainment tablet for daily use that also functions very well as an e-reader. Although the screen is versatile, don't expect the graphics to compare to those on an iPad or other high-end tablets. View now at Verizon For a limited time, Verizon is running an offer for the TCL Tab 10 Nxtpaper 5G that nets you $100 off the tablet when you purchase it

Hyperspectral scans of historical pigments and painting reconstructions

Painting Tools and Dataset Processed paint samples, using the Kubelka-Munk model to compute reflection and the painting_tools package to display the RGB values. See the corresponding notebook to understand how these parameters were estimated. This repository contains code and links to data for painting analysis using hyperspectral data. This data can be used in technical art history and computer graphics applications, for example for pigment mapping and spectral upsampling. Code and data for t

Today's NYT Mini Crossword Answers for Monday, June 16

Gael Cooper CNET editor Gael Fashingbauer Cooper, a journalist and pop-culture junkie, is co-author of "Whatever Happened to Pudding Pops? The Lost Toys, Tastes and Trends of the '70s and '80s," as well as "The Totally Sweet '90s." She's been a journalist since 1989, working at Mpls.St.Paul Magazine, Twin Cities Sidewalk, the Minneapolis Star Tribune, and NBC News Digital. She's Gen X in birthdate, word and deed. If Marathon candy bars ever come back, she'll be first in line.

Best Wi-Fi Extenders of 2025

Editor's Note: We think you should be aware that TP-Link routers are under investigation by the US government over security concerns and could be banned in the US this year, according to multiple news reports. The TP-Link Archer RE605X was previously named our best overall choice for Wi-Fi extenders. While our evaluation of the hardware hasn't changed, out of extreme caution for our readers, we decided to pause it as our top recommendation until we learn more. Read CNET's reporting for more info

A New Obesity Pill May Burn Fat Without Suppressing Appetite

An experimental obesity pill that works in a different way from the wildly popular Ozempic may help people lose weight, according to results from a small, preliminary human trial. Ozempic and other GLP-1 drugs reduce food intake by stimulating a feeling of fullness. They act on the brain to promote satiety and on the gut to slow the movement of food through the stomach, helping people feel full longer. As a result, people on the drugs lose weight because they eat less. But a new drug may be ab

Social Media Replaced Zines. Now Zines Are Taking the Power Back

One sunny afternoon in May, a century-old power plant in Brooklyn was buzzing—not with electricity, but with hundreds of creatives congregating at the Black Zine Fair. Handmade booklets piled up on table after table, forming vast paper topographies of politics and activism and culture. Marginalized groups in skating! Fictional characters “that probably made me queer”! Someone else presented zines dedicated to all the TV shows they had recorded onto VHS. Still more tables hosted zine assembly. Ev

How to Out-Troll the Trolls, as Told by the Internet’s Foremost Posters

Between the Reply Guys playing devil’s advocate and the shitposters spamming disinformation for fun, today’s trolls play in a completely different league from the keyboard warriors of yesteryear. And they don’t just troll randomly for lolz. They latch on to their targets, hoping to get a rise by spreading their brand of hate—whether racist, sexist, homophobic, or all of the above—relentlessly and more organized than ever before. Fortunately, a new generation of online avengers has emerged to pu

The Online Tools That Fueled ‘No Kings’ and the Trump Resistance

Jack and Fiona wanted to do something, but they didn’t know where to start. For months, the couple had watched as President Donald Trump and Elon Musk, then spearheading the so-called Department of Government Efficiency (DOGE), had turned the US into what they thought was “a fascist hellscape.” But they live in a deeply red county in a deeply red state in the South, and were worried that speaking out publicly could mean putting them and their children in danger. Jack, who requested WIRED use a

iPad Air vs reMarkable Paper Pro: Which tablet is best for note taking? [Updated]

Over the past few months, I’ve had the pleasure of testing out the reMarkable Paper Pro. You can read my full review here, but in short, it gets everything right about the note taking experience. Despite being an e-ink tablet, it does get quite pricey. However, there are certainly some fantastic parts of the experience that make it worth comparing to an iPad Air, depending on what you’re looking for in a note taking device for school, work, or whatever else. Updated June 15th to reflect reMark

Meta's Llama 3.1 can recall 42 percent of the first Harry Potter book

In recent years, numerous plaintiffs—including publishers of books, newspapers, computer code, and photographs—have sued AI companies for training models using copyrighted material. A key question in all of these lawsuits has been how easily AI models produce verbatim excerpts from the plaintiffs’ copyrighted content. For example, in its December 2023 lawsuit against OpenAI, the New York Times Company produced dozens of examples where GPT-4 exactly reproduced significant passages from Times sto

Chemical knowledge and reasoning of large language models vs. chemist expertise

Benchmark corpus To compile our benchmark corpus, we utilized a broad list of sources (Methods), ranging from completely novel, manually crafted questions over university exams to semi-automatically generated questions based on curated subsets of data in chemical databases. For quality assurance, all questions have been reviewed by at least two scientists in addition to the original curator and automated checks. Importantly, our large pool of questions encompasses a wide range of topics and que

David Attenborough at 99: 'I will not see how the story ends'

My earliest memory of the ocean is of a tropical lagoon. Ammonites rose and fell in the warm water column, occasionally propelling themselves forwards, their curled ram’s horn shells surprisingly streamlined in the water. This tropical lagoon was in fact in my imagination, fired as I explored the old limestone quarry near my childhood home in Leicester, some 60 miles from the coast. For a small boy in the 1930s this was a marvellous place for adventures, and the knowledge that millions of year

Telephone Exchanges in the UK

For more than a century the telephone exchange has formed the backbone of our telecommunications system. A vast array of more than 5,500 mostly nondescript buildings sit unnoticed on city, town or village streets, and quietly link up more than 254 million kilometres of cables and wires – keeping people in the UK connected to each other and the rest of the world. Since the first telephone exchange was established in London in 1879 with just eight subscribers, these anonymous looking buildings ha