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
3-Year MicroSD Endurance Test: 351 Cards, 52 Brands, 133 Petabytes Written
An independent 3-year torture test (Matt Cole / u/mikaey00) of 351 microSD cards across 52 brands: consumer cards averaged ~10,000 program/verify/erase cycles, 'high endurance' ~14,000, industrial ~122,000. SanDisk was the negative outlier; controller failure was the most common death mode.
NAND Flash Endurance: P/E Cycles, Cell Types, and Wear Leveling
Flash cells wear out with program/erase cycles; endurance falls steeply with bits stored per cell (SLC ~50-100k cycles, MLC ~3-10k, TLC ~500-5k, QLC ~100-1k). Wear leveling spreads writes across blocks — its quality, not just the NAND type, determines a product's real endurance.
Fake Flash: Counterfeit Storage That Lies About Its Capacity
Fake flash is counterfeit storage whose controller reports a larger capacity than the NAND actually present; writes beyond the real capacity are silently lost, so the card looks fine until data is read back. Detect with full-capacity write-verify tools like h2testw or F3.
systemd Socket Activation
systemd socket activation lets systemd own a service's listening socket and start the daemon on first connection — which means the listening port is defined in the .socket unit, not the daemon's own config, a classic source of 'my config change did nothing' confusion.
Hardening SSH on Ubuntu: Key-Only Auth, Custom Port, and the ssh.socket Gotchas
Standard SSH hardening on Ubuntu (key-only auth, custom port, root login off, firewall + fail2ban) plus two non-obvious traps on Ubuntu 22.10+: ssh.socket socket activation silently overriding the Port directive, and sshd failing after reboot once ssh.socket is disabled because /run/sshd is no longer created.
fail2ban: Log-Scanning Intrusion Prevention
fail2ban watches service logs for repeated authentication failures and temporarily bans offending IPs at the firewall level; a jail combines a log filter with a ban action, with SSH protection enabled out of the box on most distros.
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.