Discover From This Page & Topic: [Discover] encyclopedia
[Discover] Main Page - Citizendium http://en.citizendium.org/wiki/Main_Page
(reference collaboration research library) 
[Discover] Wikipedia http://www.wikipedia.org/ (wikipedia search wiki reference)
[Discover] Main Page - Uncyclopedia, the content-free encyclopedia http://uncyclopedia.org/wiki/Main_Page (encyclopedia humor fun funny)
[Discover] Encyclopaedia Metallum: The Metal Archives http://www.metal-archives.com/ (encyclopedia music reviews database)