Here's how to install all of Wikipedia on your desktop for offline use

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An open source application automates the process of downloading and displaying all of Wikipedia on your desktop, a large task that takes more than a day to complete.

Dubbed Xowa, the software displays an offline copy of 4.4 million Wikipedia articles with full HTML formatting intact. You can even set up additional wikis, like Wiktionary or Wikquote, and navigate between them while offline. For example, you could "Click on 'Look up this word in Wiktionary' and instantly view the page in Wiktionary."

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The SourceForge project page describes:

English Wikipedia has a lot of data. There are 13.9+ million pages with 20.0+ GB of text, as well as 3.7+ million thumbnails.

Setting all this up on your computer will not be a quick process... The import itself will require 80GB of disk space and five hours processing time for the text version. If you want images as well, the numbers increase to 100GB of disk space and 30 hours of processing time. However, when you are done, you will have a complete, recent copy of English Wikipedia with images that can fit on a 128GB SD card.

Although at least 80GB of disk space is used during setup, the wiki files end up being reduced to 25GB after the deletion of a 45GB temporary file and other cleanup.

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LINK

Can you think of better reading material for you next long flight or the next 10? You can read about every random thing under the sun and jump around articles to your heart's content.