Skip to content

0 0L1

🧩

Mind & Self

Mental Models & Famous Laws

A latticework for clearer thinking

I

Novice

Mastery0%

INovice

Basics Concepts

Decision Tools(5)Reasoning Tools(5)Systems and Cycles(2)Thinking Traps(1)

Home
Review
Search
Stats
Map

No login, no tracking
Progress lives in your browser. No accounts, no analytics, no cookies for tracking.
Works offline once loaded
Static export with manifest. Install to home screen on phone or desktop.
FSRS spaced repetition
The same algorithm modern Anki uses. Cards resurface just before you forget.
Honest game loop
XP for real learning actions only. No FOMO push, no infinite scroll, no manipulative streaks.

A daily learning loop for real-world domains. Built on epistemic honesty and spaced repetition. No dark patterns.

Catalogue

Home
Skill Map
Search

Practice

Review
Dashboard
My List

App

About
Settings

Built with care, MIT licensed.v1.0·Accessibility statement·Education, not advice. Source

Concepts›Opportunity cost

Concept 02 of 21

settled

Opportunity cost

Every choice quietly costs you the next-best thing you could have done instead.

Step 1

Predict first

In one or two sentences, what do you think this concept means? Wrong is fine; the small struggle is what makes the answer stick.

Inversion Second-order thinking