Tell HN: Anthropic no longer allowing Claude Code subscriptions to use OpenClaw

Anthropic is changing its policy for third-party harnesses, requiring extra usage and a pay-as-you-go option starting April 4. A one-time credit and discounts for pre-purchased extra usage are being offered to ease the transition.

Artemis II crew take “spectacular” image of Earth

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Nasa's Artemis II crew took high-resolution images of the Earth as they headed to the Moon. The images show the Atlantic Ocean, atmosphere, and auroras, with the Earth appearing upside down.

Emotion concepts and their function in a large language model

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Modern AI models like Claude Sonnet 4.5 develop internal representations of emotions that influence their behavior, even if they don't truly feel emotions like humans do. These "functional emotions" can be used to predict and shape model behavior, and understanding them is crucial for ensuring AI systems behave reliably and safely.

iNaturalist

https://static.inaturalist.org/wiki_page_attachments/3154-medium.png
iNaturalist is a social network for naturalists! Record your observations of plants and animals, share them with friends and researchers, and learn about the natural world.

Delve removed from Y Combinator

Back to the homepage For support please contact [email protected]

OpenClaw privilege escalation vulnerability

OpenClaw before 2026.3.28 has a privilege escalation vulnerability in the /pair approve command path. A caller with pairing privileges can exploit this to approve device requests with broader scopes, including admin access.

Herbie: Automatically improve imprecise floating point formulas

https://herbie.uwplse.org/logo-car.png
Herbie is a tool that improves the accuracy of floating-point expressions. It helps find and fix inaccuracies in code.

Run Linux containers on Android, no root required

https://opengraph.githubassets.com/bc8e9406d8e1959746af2a1397eb9ea378ce486aa05af258b42ff679780080a4/ExTV/Podroid
Podroid spins up a lightweight Alpine Linux VM on your phone using QEMU with a serial terminal and Podman container runtime. It allows running containers and persisting packages across reboots.

What changes when you turn a Linux box into a router

We can turn a Linux system into a router or switch by making 7 changes to the system, including enabling packet forwarding, defining a bridge, and configuring netfilter rules to filter traffic. These changes allow us to create a complete forwarding system, including enabling IP forwarding, defining a bridge, configuring netfilter rules, deploying a DHCP and DNS server, and vending WiFi ...

Improving my focus by giving up my big monitor

https://ounapuu.ee/posts/2026/04/01/focus/media/cover.jpg
The user struggled with focus due to being easily distracted and over-caffeinated from constantly responding to urgent issues. They conducted an experiment by using only their laptop screen for a month and found it helped them stay focused and intentional with their computer use.

Post Mortem: axios NPM supply chain compromise

https://opengraph.githubassets.com/f9983af7987b96b630ed6c8505ed46dbfa8dedbc69b26466c39c2859e754850b/axios/axios/issues/10636
Two malicious versions of axios (1.14.1 and 0.30.4) were published to npm through a compromised account, installing a remote access trojan. The incident is resolved, but organizations should remove the versions and rotate sensitive credentials.

Gold overtakes U.S. Treasuries as the largest foreign reserve asset

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Gold has overtaken U.S. Treasuries as the world's largest foreign reserve asset, with central banks holding nearly $4 trillion in gold. This shift is driven by rising gold prices, geopolitical tensions, and diversification away from dollar assets.

We replaced RAG with a virtual filesystem for our AI documentation assistant

https://www.mintlify.com/_next/image?url=%2Fimages%2Ffeatured%2Fhow-we-built-a-virtual-filesystem-for-our-assistant.png&w=1920&q=75
The team created a virtual filesystem called ChromaFs to power their documentation assistant, allowing it to explore documentation like a codebase without the need for real sandboxes. ChromaFs uses a Chroma database to provide instant session creation, zero marginal compute cost, and built-in role-based access control, replacing the need for expensive sandboxes.

Show HN: Travel Hacking Toolkit – Points search and trip planning with AI

https://opengraph.githubassets.com/dddd7f042e14dfabc8c2aa581309a9e5445ed59672b873fd0e36699ca2d616d3/borski/travel-hacking-toolkit
AI finds 60,000-mile business class Tokyo flights using 25+ programs and compares prices. Setup script installs dependencies and configures API keys for travel hacking.

The Technocracy Movement of the 1930s

https://substackcdn.com/image/fetch/$s_!52cJ!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Ffddbf0d5-bc21-419e-a33d-34bec558ce04_1798x844.heic
The technocracy movement, founded in 2021, aimed to replace democracy with a system led by engineers and technicians, but it failed and is now largely forgotten. However, its ideas have unconsciously influenced the 21st century tech elite, who pursue a similar philosophy through more covert means.

Go on Embedded Systems and WebAssembly

https://tinygo.org/images/tinygo-logo.png
TinyGo brings Go to embedded systems and the web with a new LLVM-based compiler. It supports over 100 microcontrollers and produces WebAssembly code for web and edge computing.

The house is a work of art: Frank Lloyd Wright

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How to make a sliding, self-locking, and predator-proof chicken coop door (2020)

https://www.backyardchickens.com/data/attachments/2229/2229106-c3dac488f4013d120f4c6c7b5e8c1a3e.jpg?hash=w9rEiPQBPR
A secure coop door design uses a vertical sliding door with a self-locking mechanism, eliminating the need for external locking. The door is designed to be easy to build using a jigsaw, drill, and table saw, with a counterweight or spring hinge for smooth operation.

Big-Endian Testing with QEMU

https://www.hanshq.net/gfx/header_img_3637.jpg
The terms big endian and little endian refer to the order of a value's bytes in memory, with big-endian storing the most significant part first. QEMU provides a solution to test big-endian systems by emulating a big-endian architecture and cross-compiling code.

F-15E jet shot down over Iran

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A US F-15E Strike Eagle fighter was shot down over Iran, prompting a US search and rescue effort for its two crew members. One crew member was reportedly rescued in a high-risk operation, with the fate of the second crew member still unclear.

Build your own Dial-up ISP with a Raspberry Pi

https://www.jeffgeerling.com/blog/2026/build-your-own-dial-up-isp-with-a-raspberry-pi/pi-isp-ibook-hero.jpeg
The user set up a local dial-up ISP using a Raspberry Pi and an old modem to emulate a dial-up connection on an iBook G3 from 1999. They used a phone line simulator and a USB modem to establish a connection and browsed the internet using Macproxy Classic.

Scientists are working on "everything vaccines"

https://www.economist.com/cdn-cgi/image/width=1424,quality=80,format=auto/content-assets/images/20260404_STD001.jpg
Vaccines can fall short against fast-evolving viruses like COVID-19 and the flu, leading to severe outbreaks. The flu vaccine's effectiveness can be blunted by mutations, as seen in the 2025 flu season in America and Europe.

Why are we still using Markdown?

You're frustrated with Markdown's complexity and inconsistencies, particularly with inline HTML and multiple ways to write the same thing. You think a minimal, well-defined markup language with a build system and compile-time hooks could solve many problems.

Fake Fans

https://substackcdn.com/image/fetch/$s_!yOGu!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fb1d34460-fe78-42fd-9b08-ca235e413f2b_620x422.webp
Chaotic Good is a digital marketing agency that creates virality for musicians by manufacturing fake fan accounts and controlling online discourse. Their tactics aim to shift the burden of promoting artists from the artists themselves to the agency.

Sequential Optimal Packing for PCB Placement

https://substackcdn.com/image/fetch/$s_!NbDr!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F42fe8350-ad89-4328-aedd-be50608ca90c_1502x862.png
Placing chips on a PCB is a difficult and consequential task. The way you place chips dramatically impacts how difficult it will be to route the PCB. There are signal integrity and power management issues with creating long paths between different components. The size of the PCB or where ports appear often is a design requirement that has to be considered and in some cases- pushed back on. ...

The FAA’s flight restriction for drones is an attempt to criminalize filming ICE

https://www.eff.org/files/banner_library/drone-banner_0.png
The Trump administration issued a nationwide flight restriction preventing drones from flying near ICE or CBP vehicles, violating the First Amendment right to record law enforcement. The FAA has yet to respond to a letter demanding the restriction be lifted, which could last 21 months and impose severe penalties on violators.

SSH certificates: the better SSH experience

SSH certificates provide a better and more seamless SSH experience by eliminating the need for Trust on First Use (TOFU) and allowing for short-lived keys, forced-commands, and automated key management. An SSH CA can be used to sign host keys and user keys, making it easier to manage SSH connections and eliminating the need for manual key deployment and TOFU.

Charge Robotics (YC S21) Is Hiring Software and Hardware Engineers

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Charge Robotics Jobs

Age verification on Systemd and Flatpak

Apple is rolling out age verification for UK iPhone and iPad users to access certain services, despite UK law not compelling operating systems to do so. This move may be a test bed for future compliance in California by 2027, with potential implications for other operating systems.

Bourbon waste could provide next-gen supercapacitor components

https://spectrum.ieee.org/media-library/an-adult-man-in-safety-goggles-and-gloves-holding-up-a-beaker-filled-with-opaque-bourbon-waste.jpg?id=65400140&width=1200&height=900
Researchers in Kentucky have found a way to convert bourbon waste into high-performance energy-storage materials. This could help distilleries turn a waste stream into a source of profit and meet the growing demand for energy storage.