# Knowledge > Knowledge is [Information](Information.md) that has causal power[^1]. TODO: Chapter 8, FOR. Once you have updated this, go back and make any necessary tweaks to [Problem Driven Epistemology](Problem%20Driven%20Epistemology.md). Within one universe it looks irregular; across universes it has a regular structure, like a crystal in the multiverse. In the past knowledge was defined as [Justified True Belief](Justified%20True%20Belief.md). The critical attack on that was on [Justification](Justification.md). It forces one to conclude that [Justified True Belief](Justified%20True%20Belief.md) doesn't exist. And if you call that truth, then truth doesn't exist. But this isn't what we mean by truth in every day life!" [Knowledge is Created Through Conjecture and Criticism and Evolution](Knowledge%20is%20Created%20Through%20Conjecture%20and%20Criticism%20and%20Evolution.md). There are two types of knowledge: 1. [Explanatory Knowledge](Explanatory%20Knowledge.md) 2. [Non-explanatory Knowledge](Non-explanatory%20Knowledge.md) --- Date: 20220617 Links to: [Self-Similarity](Self-Similarity.md) [Truth](Truth.md) Tags: #review References: * [The Popperian Podcast #1 – David Deutsch – ‘Karl Popper and the Beginning of Infinity’ — The Popperian Podcast — Overcast](https://overcast.fm/+AAmesWrRQ3I/35:10) [^1]: [David Deutsch on the infinite reach of knowledge | The TED Interview - YouTube](https://youtu.be/cEfG1PHNB64?t=814)