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YC News

From new batch announcements to alumni raising major rounds, Y Combinator remains a bellwether for early-stage tech. This section collects news involving the accelerator, the startups that pass through it, and the ideas and trends its community is betting on.

Stories here range from changes to the program itself, its deal terms, batch sizes, and leadership, to the successes and stumbles of companies it funded years ago. Batch composition gets particular attention, since the categories founders cluster around tend to foreshadow broader trends.

For anyone working in or around startups, following this accelerator is an efficient habit: it condenses signals about talent, ideas, and capital into one observable community. Founders weighing an application also use this coverage to understand what the program has become.

Brussels launched an age checking app. Hackers took 2 minutes to break it
2026-04-20

The European Commission recently launched a new age verification app, claiming the technology was fully prepared for deployment, but cybersecurity experts quickly identified critical flaws. Hackers successfully breached the application in just two minutes, exposing significant security vulnerabilities in the EU digital initiative.

M 7.4 earthquake – 100 km ENE of Miyako, Japan
2026-04-20

A magnitude 7.4 earthquake has struck 100 kilometers east-northeast of Miyako, Japan. The significant seismic event was detected off the northeastern coast of the country.

Turtle WoW classic server announces shutdown after Blizzard wins injunction
2026-04-20

The popular fan-run Turtle WoW private server for World of Warcraft is shutting down after Blizzard Entertainment successfully secured a legal injunction against the project. The beloved community server will cease operations following the court order, bringing an end to its unique run of custom classic content.

Kimi K2.6: Advancing open-source coding
2026-04-20

Kimi K2.6 advances open-source coding by introducing innovative features such as long-horizon coding and coding-driven design. The release also enhances collaborative AI capabilities through proactive agents, agent swarms, and the newly introduced Claw Groups research preview.

Sauna effect on heart rate
2026-04-20

A new study analyzed over 59,000 wearable data records from 256 sauna users to quantify the precise physiological effects of heat therapy. By applying statistical tests to same-day heart rate metrics, researchers provided concrete data on how sauna sessions impact cardiovascular strain.

Quantum Computers Are Not a Threat to 128-Bit Symmetric Keys
2026-04-20

Security experts confirm that quantum computers do not pose a threat to current 128-bit symmetric encryption keys. This consensus is based on the specific scaling details of Grover's algorithm. Consequently, organizations do not need to increase their symmetric key sizes during the transition to post-quantum cryptography.

Deezer says 44% of songs uploaded to its platform daily are AI-generated
2026-04-20

Music streaming service Deezer reports that 44% of daily song uploads are now AI-generated. Despite this high volume of new tracks, actual listener consumption of AI music remains low, accounting for only 1% to 3% of total streams. Furthermore, the company detects and demonetizes 85% of these AI streams, identifying them as fraudulent activity.

Stop trying to engineer your way out of listening to people
2026-04-20

Tech teams often attempt to solve workplace communication breakdowns with engineering solutions instead of addressing the root issues of poor dialogue. The author argues that failing to listen and talk to one another is the primary driver of these software development problems. Ultimately, designers and product leaders must prioritize genuine human conversation over technical workarounds to improve collaboration.

10 years ago, someone wrote a test for Servo that included an expiry in 2026
2026-04-20

A decade ago, a developer added a unit test to the Servo project with a hardcoded cookie expiry date of April 2026. The project's continuous integration pipeline is currently broken and will remain unresolved until another maintainer merges a pull request to address the issue.

A Brief History of Fish Sauce
2026-04-20

This article explores the rich history of fish sauce, tracing its origins from ancient Asian recipes to its widespread use during the Roman Empire. It details how this pungent condiment evolved over the centuries to become a beloved staple in modern global cuisine, highlighting its many delicious contemporary uses.

NSA is using Anthropic's Mythos despite blacklist
2026-04-20

The NSA is adopting Anthropic's Mythos AI model, reversing a previous Pentagon decision to blacklist the company as a supply chain risk. This integration marks a major shift in government procurement after officials initially attempted to penalize the firm.

Modern Rendering Culling Techniques
2026-04-20

Modern rendering culling techniques optimize graphics performance by identifying and excluding unseen objects, such as obscured trees or buildings, from the rendering pipeline. This process prevents GPUs from wasting computational resources on drawing invisible geometry that falls outside the camera's field of view. Implementing these advanced culling methods is essential for maintaining high frame rates and ensuring smooth visual experiences in complex 3D environments.

Jujutsu megamerges for fun and profit
2026-04-20

A new practical guide details how to implement and maintain efficient megamerge workflows using the Jujutsu version control system. By adopting these advanced techniques, developers can significantly accelerate their code integration processes while minimizing merge conflicts.

Kefir C17/C23 Compiler
2026-04-20

Kefir is an independent C17/C23 compiler developed by a single programmer to provide a simple, maintainable alternative to industry standards like GCC and Clang. By introducing a third compiler implementation, the project helps developers vet code portability and catch hidden bugs stemming from compiler-specific extensions and preprocessor defines. The tech community has praised the solo project for its impressive test suite and its value in diversifying the C language ecosystem.

Claude Token Counter, now with model comparisons
2026-04-20

The creator of the Claude Token Counter has upgraded the tool with a new model comparison feature. This update allows users to run token counts on the same input text across multiple different AI models to easily compare their results.

OpenClaw isn't fooling me. I remember MS-DOS
2026-04-20

Reader discussions comparing the rapid success of OpenClaw to MS-DOS and modern large language models highlight the tech industry's tendency to reward reckless innovation over careful planning and safety. Critics argue this shortcut-driven approach, exemplified by OpenAI's deployment of these models, facilitates copyright theft and threatens jobs while prioritizing short-term profit. Furthermore, commentators warn that the unchecked proliferation of AI-generated content increases global information entropy by destroying the historical link between written text and authentic human authorship.

Soul Player C64 – A real transformer running on a 1 MHz Commodore 64
2026-04-20

Developers behind the Soul Player C64 project have successfully run a 25,000-parameter transformer AI model on an original 1 MHz Commodore 64. This remarkable feat showcases extreme software optimization by fitting modern machine learning architecture onto severely limited retro hardware. The project highlights the ongoing creativity of programmers pushing vintage machines far beyond their original design capabilities.

Scientific datasets are riddled with copy-paste errors
2026-04-20

A recent analysis of Excel files from 600 published scientific papers has revealed widespread copy-paste errors within the underlying datasets. These findings highlight significant data integrity issues and raise concerns regarding the overall accuracy of published scientific research.

Up to 8M Bees Are Living in an Underground Network Beneath This Cemetery
2026-04-20

Researchers in Ithaca, New York, have discovered one of the largest known aggregations of ground-nesting bees living in an underground network beneath a local cemetery. The hidden subterranean colony is estimated to house up to eight million individual bees.

OpenAI ad partner now selling ChatGPT ad placements based on “prompt relevance”
2026-04-20

An OpenAI advertising partner is launching a pilot program that sells ChatGPT ad placements dynamically matched to user prompt relevance. Advertisers will pay CPMs ranging from $15 to $60 for these placements, with a $50,000 minimum spend required to participate.