I've been writing a personal encyclopedia for the last five or six years or so. I have some 1500+ articles multiple of which are 50+ pages. I think it's been really valuable. I think I get a few things out of it:<p>1. Perfect recall. Every little detail I read in a book/blog/article stays with me. Makes it easy to synthesize results from multiple pieces across time, which is useful when you only have a casual interest in something. (I really like downloading the cool education images/GIFs and and inserting them in articles- otherwise I don't know where I'd keep them.)<p>2. Reveals what I don't know about a subject. For example, whenever I start off writing a new article on some topic, the first thing I write is a definition, e.g. "A cat is an animal that ...". The process of doing that often reveals gaps in my understanding.<p>3. It makes me better at asking questions when I'm trying to understand something. The analogy I like to make here is that learning a second language is harder than a third language, because after learning the second you know what you need to know to understand a language. But there's no reason that should be limited to languages and couldn't apply to all things, and things themselves. Some questions I like to ask are "What is the function/uses of this thing?" "What are the parts of this thing and how are they arranged?" "How do we make this thing?" "What's the history of this thing?" "What subtypes of this thing are there?"<p>The downside is that it dramatically slows down my reading speed, since I now feel I need to take detailed notes, and then I often have to reconcile them with notes on other things which can be time-consuming. Considering the number of books a person could realistically read in their lifetime is limited, it's unclear if it's worth the tradeoff.<p>I'm curious how other people think about remembering things, and if they have a system, what tools they use. It seems unsatisfying to me to read a book and realize I'll probably forget it in four years, yet most people seem content to do so.<p>If anyone is interested in the specific software I use, here's the Github project: <a href="https://github.com/Ceasar/Encyclopedia" rel="nofollow">https://github.com/Ceasar/Encyclopedia</a>. It uses restructuedText (as opposed to Markdown) for the text. I edit them using Vim. All the files are stored in Dropbox so it gets synced between my devices. A simple Flask web server renders the pages in a prettier format.<p>Still very primitive compared to what it could potentially be, but combined with regular Unix command line tools it's worked fine for my needs. (I like the idea of a hacker-wiki by the way, more than something like this which comes out of the box. Seems like an personal wiki designed for a power user could be way more interesting.)