A free knowledge base of cognitive biases, logical fallacies and mental models
A field guide to the mind
Moresapien maps out the cognitive biases, logical fallacies, manipulation tactics and rhetorical devices that shape how we think - and how others try to think for us. Written for everyone, free to use.
Explore concepts in psychology, logic and persuasion
From cognitive biases and logical fallacies to mental models and systems thinking - each entry explains a concept in plain language, with real-world examples and connections to related ideas.
Browse all entries →Confirmation Bias
We seek out information that supports what we already believe, and ignore what doesn't.
Logical FallacyStraw Man
Misrepresenting someone's argument to make it easier to attack.
Manipulation TacticGaslighting
Manipulating someone into doubting their own perception, memory, or sanity.
Mental ModelFirst Principles Thinking
Breaking a problem down to its most basic truths and building up from there, rather than reasoning by analogy.
Curated collections for critical thinking and media literacy
Themed pathways that group related concepts into guided journeys - ideal for students, teachers, and anyone who wants a structured way through the material.
See all collections →- The Misinformation Toolkit
- The Classroom Misinformation Toolkit
- How the World Gets Inside Your Head
- Why We'd Rather Have Less Than Let Others Have More
- Anatomy of a Political Argument
- How to Survive the News
- How to Think Better
- The Manipulator's Playbook
- Why We Think Everyone Agrees With Us
- How Bad Information Becomes Common Knowledge
- Why We Judge Fallen Heroes More Harshly Than Known Villains
Ten categories spanning psychology, rhetoric and systems thinking
Every entry belongs to a category that helps you understand not just what the concept is, but what kind of thinking it represents - whether that's a bias, a fallacy, a tactic, a defence, or a model.
Browse by category →See how every concept connects to every other
The real value of this knowledge base isn't any single entry - it's the web of relationships between them. Our interactive knowledge graph maps every connection across all categories.
Explore the graph →Stay curious
New entries and ideas, straight to your inbox. No spam, ever.