Cognition and knowledge / 2. Individual Reasoning / 3. Groups and Ideas / 4. A need for standards / 5. Logic and Artificial Worlds / 6. Probabilistic induction and its limits / 7. Decisions / 8. Dangers of deciding on ideas / 9. Theories and Philosophy of Science / 10. Auxiliary hypothesis / 11. Solomonoff machines / 12. On Arguments and fallacies / 13. As many as possible / 14. Quantum Mechanics / 15. Current problems in physics / 16. The Humanities / 17. Data and theories / 18. Conclusion