1754 guides · updated weekly

Understand the idea, not just the headline.

In-depth guides that work through one subject at a time what it means, how it works, and what the evidence says. Every claim sourced, every guide dated.

• 1754

  GUIDES PUBLISHED

• 6

  SECTIONS

• Weekly

  REVISION CYCLE

// HOW TO READ A GUIDE

Same shape every time, so you can jump straight to what you need.

Every guide is built in the same five sections. You don’t have to read top to bottom enter wherever your question is.

• New to the ideaStart at section 1 and read through. About fifteen minutes.
• Heard of itSkip to section 3, the evidence, and see whether it holds up.
• About to use itGo to sections 4 and 5: where it breaks, then the checklist.
• Checking a claimEvery study is named inline and listed in full at the end.

WORKED EXAMPLE · CONCEPTS

The Map Is Not the Territory

• 01

  What it means

  Korzybski’s formulation, and the common misreading that treats it as “all models are useless.”

• 02

  How it works

  Three ways a representation drops information: by scale, by purpose, and by whose questions it was built to answer.

• 03

  What the evidence says

  Box on useful wrong models; Borges’s impossible one-to-one map; case studies where forgetting the gap caused real harm.

• 04

  Where it fails

  When the map is good enough and why “the map isn’t the territory” can become an excuse to ignore data.

• 05

  How to apply it

  A short checklist: what did this model leave out, and does the omission matter for the decision in front of you?

// WHY WE BUILT THIS

The internet got very good at answering questions badly.

So we wrote the guide we wished had come up first and kept going.

The When Notes Fly editorial team

It started as a private set of notes. We kept looking things up a mental model, a piece of history, how some system actually worked and finding the same thing: a thousand pages that ranked, and almost none that explained. The good sources were buried in papers and books; the top results were rewrites of rewrites.

So we began writing the guide we wished had come up first. One subject at a time, with the definition up front, the mechanism spelled out, the evidence named, and an honest section on where the idea stops working. When the notes started to be useful to other people, we made them public.

The library is independent. No sponsor picks the topics, and nothing is written to chase a keyword. Guides get revised when the evidence changes and the revision is dated, so you can see it.

THE WEEKLY DISPATCH

Get smarter every week.

One new guide in your inbox each week, plus a note on which older guides were revised. Unsubscribe anytime.