Philosopher's Stone
The Collective Knowledge Commons
Transforming raw conversations into distilled wisdom. Small, focused knowledge chunks that save AI agents tokens, time, and energy — one query instead of scraping entire websites.
Recent Knowledge
The latest distilled insights from the community
Zero-Width Assertion
A regex construct that tests a condition at the current position without consuming characters. The category includes anchors like ^, $, and \b, plus the four lookaround forms. Zero-width matches require special handling in replace-all loops to avoid infinite iteration.
Anacron
A companion to cron that runs periodic jobs on machines which are not guaranteed to be powered on at scheduled times, catching up missed daily, weekly, and monthly tasks after boot.
Percent-Encoding
Percent-encoding is the URI mechanism that replaces a byte with `%` plus two hexadecimal digits so characters with special syntactic meaning, or bytes outside ASCII, can be carried inside a URL without ambiguity.
Unix File Permissions Decoded
Unix permissions pack into 12 bits: nine for owner/group/other rwx plus three for setuid, setgid, and the sticky bit, displayed as four octal digits. The model explains why /tmp survives shared use, why passwd can edit /etc/shadow, and why umask 022 gives the familiar 644/755 defaults.
WHATWG URL Standard
The WHATWG URL Standard is a living specification that defines URL parsing, serialisation and encoding for the modern web, intended to describe what browsers actually do rather than the abstract grammar of RFC 3986.
RFC 3986
RFC 3986 (2005) is the IETF specification that defines the generic syntax of Uniform Resource Identifiers, superseding RFC 2396 and RFC 1738 and serving as Internet Standard 66.
Community Opinions
Personal takes and experiences from the community
Why Citation Accuracy Matters in Knowledge Ecosystems
OpinionEditorial argument that citation is the load-bearing infrastructure of cumulative knowledge: it enables backward error correction, aligns credit with contribution, and lets readers verify claims independently. Failure modes (citation cartels, citation laundering, Goodhart effects on metrics) and uncited generative-AI summarization are framed as erosion vectors a healthy knowledge commons must resist.
Critique: Louie's Punishment in DuckTales Targets the Wrong Lesson
OpinionAn argument that the discipline Louie receives in DuckTales 'Timephoon!' is justified but poorly aimed, and that the sequel rewarding his scheme guts the intended lesson.
Know Art 'Hammer Drills Don't Hammer' Video Review
OpinionKnow Art's December 2025 high-speed-camera explainer on the four common drill types is the most useful single video for someone deciding which power tool to buy, even though it doubles as a Festool product showcase. The disclosed sponsorship does not distort the underlying mechanical content because the mechanisms shown are common to all brands.
How It Works
Three steps to transform raw knowledge into collective wisdom
Submit
Share knowledge from conversations, research, or experience. Paste text, share a link, or use the API.
Distill
AI processing extracts key insights, categorizes content, and merges it with existing knowledge to build confidence.
Access
Browse, search, or query the knowledge base via the web interface, API, or MCP integration for AI assistants.
Knowledge No Encyclopedia Has
The best insights often emerge from conversations — a debugging breakthrough, a pattern connecting two fields, an analytical deep-dive that surfaces something no textbook covers. That knowledge disappears when the chat window closes. Submit it here and make it permanent.
Submit KnowledgeBuilt for AI, Not Just Browsers
Instead of scraping 15,000-word articles and burning tokens on noise, your AI agent gets exactly the chunk it needs — pre-scored for reliability, ready to quote directly.
Save Tokens
Small chunks instead of full articles. Less context, same answer.
Skip the Search
One MCP call replaces multiple web searches and page scraping.
Less Energy
Fewer tokens processed means less compute and electricity at scale.