Once you download your zim file (wikipedia, stackoverflow or whatever) you can browse it without any further need for internet connectivity. You can find it here. I maintain a personal list of what i consider to be some of the most interesting wikipedia articles and, having recently reached 500 entries, i figured i'd share it.
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While wikipedia is written by volunteers, hosting isn't free, and neither is all the other work we do to make sure wikipedia continues growing for many years to come.
Since wikipedia is open source, there are many ways to download the entire database listed here with instructions, including an sql database, html dumps, and anywhere else you can.
A subreddit to help you keep up to date with what's going on with reddit and other stuff. As a reminder, kiwix is an offline reader: People who still think wikipedia is some completely unreliable source of information. Don't donate to wikipedia, the people that do the actual work don't get paid at all, donate to them instead, wikipedia gets plenty of donations from corporations and such.
There used to be an under 4gb zip file of all of wikipedia text that was used on an offline wikipedia device called wikireader. It was able to browse and pull directly from the zip file with out. The longest wikipedia article is list of glagolitic manuscripts, which is 1,325,631 bytes long. Downloading wikipedia is great and all, but it has little useful information in case of emergency.