Wikipedia is huge. It does not always have the most accurate entries, but you can learn a lot by going through its content. You don’t even have to be online to consume Wikipedia content as there are many offline apps available for it. The Wikipedia Books Project aims to take this a step further by making books from Wikipedia content. This project will result in about 1000 books with 1200 pages each. Of course, one would need a huge bookcase to store these.
These books will be displayed at a public exhibition. It certainly sounds like a fun project but you need to support it on Indiegogo to make it happen.