All the education and references sites on the Interweb to help you learn stuff, whether to just learn things in general, or find answers to questions for something like a crossword puzzle or generally just popping into your head at random.
Online Encyclopedias & Dictionaries
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AlltheInterweb Encyclopedia
Online Encyclopedia project of AlltheInterweb
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Conservapedia
Conservapedia is an English-language wiki encyclopedia project written from an American conservative point of view
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Encyclopedia Britannica
Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.
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SABRE Wiki
The most complete archive of information on the British and Irish road networks on the web.
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Wikipedia
Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Question and Answer Websites
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AlltheInterweb Answers
AlltheInterweb's effort at a Q&A website, set up after the webmaster got frustrated with over-zealous moderation at Yahoo Answers during the early days there.
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Answers.com
The place to go to get the answers you need and to ask the questions you want.
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Quora
A place to gain and share knowledge. It's a platform to ask questions and connect with people who contribute unique insights and quality answers.
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Yahoo Answers
A community-driven question-and-answer website or a knowledge market from Yahoo!, that allows users to both submit questions to be answered and answer questions asked by other users.