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YC News Today

Keeping an eye on Y Combinator is a quick way to spot where early-stage tech is heading. Here you will find recent stories about the accelerator, its startup batches, alumni milestones, and funding news from companies with YC roots.

On a typical day this might mean a batch company announcing its seed round, an alumnus reaching unicorn status or getting acquired, a new program initiative, or analysis of the ideas dominating the latest cohort. Together the items form a running pulse of the ecosystem.

Early-stage activity is scattered and hard to track, which is what makes a concentrated community like this one so useful to watch. Investors scouting deals, founders studying the competition, and journalists mapping trends all rely on this steady stream of signals.

Replace IBM Quantum back end with /dev/urandom
2026-04-25

A developer launched a satirical GitHub repository named quantumslop that replaces the IBM Quantum backend with the Linux /dev/urandom random number generator. Although the project failed to win a QDay programming challenge, it offers a humorous take on the noise and hype surrounding current quantum computing advancements.

Martin Galway's music source files from 1980's Commodore 64 games
2026-04-25

A newly launched GitHub repository now hosts Martin Galway's original music source files from classic 1980s Commodore 64 games. This open-source initiative allows developers and retro gaming enthusiasts to access, preserve, and contribute to the historical audio code.

There Will Be a Scientific Theory of Deep Learning
2026-04-25

A newly published arXiv paper posits that a rigorous scientific theory of deep learning will inevitably emerge to fully explain neural network behavior. The authors argue that transitioning from purely empirical observations to a unified mathematical framework is essential for the field's continued advancement. This foundational theory aims to demystify exactly why deep learning models generalize so effectively despite their immense architectural complexity.

The Joy of Folding Bikes
2026-04-25

A commuter reflects on their eleven-year experience using a folding bike to seamlessly navigate London's public transit network, highlighting its convenience and theft-prevention benefits. The author emphasizes that the compact device eliminates expensive station parking and offers long-term financial savings, making it a highly practical and cost-effective alternative to traditional urban transit.

Work with the garage door up (2024)
2026-04-25

Discussions surrounding a recent article about working with the garage door up explore the benefits and psychological hurdles of building tech projects in public versus behind closed doors. While transparent development can demystify the creation process and engage communities, some developers find that sharing unfinished work prematurely drains their motivation due to the goal disclosure effect. Ultimately, the conversation highlights how individual psychology dictates whether creators thrive with their metaphorical garage door open or closed.

Humpback whales are forming super-groups
2026-04-25

Photographers recently captured images of 304 individual humpback whales during a misty morning in December. This marks the highest number of large whales ever identified in a single day. The record-breaking gathering highlights a growing trend of these marine mammals forming massive super-groups.

Paraloid B-72
2026-04-25

A reader discussion highlights the versatile applications of the acrylic resin Paraloid B-72, specifically its use in an acetone solution to preserve and strengthen porous materials such as human bones and fossils. The conversation also explores the complex science of structural adhesives, noting the proprietary trade secrets of major chemical companies and recommending specific consumer-grade products for various bonding needs.

Firefox Has Integrated Brave's Adblock Engine
2026-04-25

Mozilla has integrated Brave's ad-blocking engine directly into Firefox 149. The company shipped the update quietly to improve the browser's native content-blocking capabilities. Notably, the new feature was not mentioned in the official release notes.

Education must go beyond the mere production of words
2026-04-25

As artificial intelligence becomes increasingly capable of generating written content, the traditional focus on mere word production is no longer sufficient for modern education. Authentic learning must now evolve to prioritize deeper critical thinking and uniquely human skills that technology cannot easily replicate.

Simulacrum of Knowledge Work
2026-04-25

This article explores the growing challenge of verifying the quality of AI-generated knowledge work, such as market analyses and professional reports. It questions how professionals can confidently evaluate these outputs without having to manually redo the underlying work to check for accuracy.

A 3D Body from Eight Questions – No Photo, No GPU
2026-04-25

Researchers have developed a machine learning model that generates accurate 3D body shapes from just eight questionnaire inputs without requiring photos or GPU inference. By training with a differentiable physics loss, the system significantly outperforms traditional baselines and achieves a mass prediction mean error of only 0.3 kilograms.

A web-based RDP client built with Go WebAssembly and grdp
2026-04-25

A new open-source project called grdpwasm introduces a web-based RDP client built with Go WebAssembly and the grdp library. This tool allows users to access remote desktops directly through their web browser without requiring additional local software. The code is currently available on GitHub for the community to test and contribute to its ongoing development.

Hokusai and Tesselations
2026-04-25

A recently digitized 1884 pattern book by Katsushika Hokusai, originally created for kimono textiles, highlights his lasting influence on the mathematical tessellation work of M.C. Escher. Readers are exploring high-resolution digital archives of the collection to study the intricate designs found within the historical album. The discussion also features an ongoing debate regarding whether Hokusai successfully incorporated all seventeen mathematical plane symmetry groups into his patterns.

What async promised and what it delivered
2026-04-25

The async/await evolution solved previous programming challenges by introducing sequential syntax that greatly improved code readability. However, this approach has introduced new structural costs and obscured crucial execution details. Specifically, the sequential appearance hides which operations actually depend on one another, demanding greater structural awareness from developers.

GPT‑5.5 Bio Bug Bounty
2026-04-25

OpenAI has published details regarding its Bio Bug Bounty program to address potential biological security risks associated with advanced models like GPT-5.5. The initiative incentivizes security researchers to identify and report vulnerabilities, highlighting the company's ongoing commitment to AI safety and the mitigation of cyberbio threats.

Discret 11, the French TV encryption of the 80s (2020)
2026-04-25

The article explores the history and technical mechanisms of Discret 11, the analog television encryption system used for French pay-TV in the 1980s and 1990s. Readers in the discussion share nostalgic memories of their youth spent attempting to pirate these scrambled signals using makeshift antennas, brute-force software, and hardware modifications. These early hacking efforts to circumvent encryption and watch restricted programming served as a formative technical learning experience for many future engineers.

The mail sent to a video game publisher
2026-04-25

Inspired by a 1980s Activision idea, video game publisher Panic recently sent out physical mail to its community and received a wildly diverse range of responses. This nostalgic initiative has generated incredible and unexpected outcomes for the studio behind modern titles like Despelote and Arco. The campaign highlights the enduring appeal of retro community engagement in the modern gaming industry.

Open source memory layer so any AI agent can do what Claude.ai and ChatGPT do
2026-04-25

Stash is a new open-source, self-hosted memory layer that provides AI agents with persistent memory, knowledge graphs, and self-modeling capabilities. It is compatible with major models like Claude and ChatGPT, as well as Ollama and any MCP-compatible agent. This enables developers to easily add advanced contextual recall and goal tracking to their custom AI applications.

Show HN: A Karpathy-style LLM wiki your agents maintain (Markdown and Git)
2026-04-25

YC S26 startup Nex.ai has launched WUPHF, a platform enabling users to deploy collaborative teams of AI agents. These agents work together over a shared context to maintain a dynamic, Markdown and Git-based wiki inspired by Andrej Karpathy. The system is compatible with multiple popular coding tools and local large language models to streamline multi-agent workflows.

Cosmology with Geometry Nodes
2026-04-25

Researchers are increasingly applying Geometry Nodes, a procedural 3D modeling tool, to real-world cosmology research. By leveraging these visual programming techniques, scientists can efficiently model complex cosmic structures and visualize massive astronomical datasets. This unexpected crossover highlights the growing utility of creative software in solving advanced scientific problems.