# Obsidian Zettelkasten

**URL:** <https://forum.obsidian.md/t/obsidian-zettelkasten/1999>\
**Category:** Knowledge management\
**Tags:** zettelkasten\
**Created:** [June 16, 2020, 7:12pm UTC](https://forum.obsidian.md/t/obsidian-zettelkasten/1999 "2020-06-16T19:12:38Z")\
**Posts on this page:** 1\
**Showing post:** 122

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**Author:** ![lizardmenfromspace](https://forum.obsidian.md/user_avatar/forum.obsidian.md/lizardmenfromspace/32/19233_2.png) [@lizardmenfromspace](https://forum.obsidian.md/u/lizardmenfromspace)\
**Post date:** [July 6, 2020, 8:06pm UTC](https://forum.obsidian.md/t/obsidian-zettelkasten/1999/122 "2020-07-06T20:06:20Z")

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**121 - Unsurprising & Useful** - this category of information typically is what you’ve already learned. Because you already know it, it is useless when presented to you again. Ideally you’d instead want to be presented with new information.

The one exception to this is periodic review. If you don’t use material or review it then the [retrieval strength](https://www.learningscientists.org/blog/2016/5/10-1#:~:text=Retrieval%20strength%20(RS)%20is%20a,and%20forth%20between%20these%20values.) for a memory will eventually drop to where you forget information.

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