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User-powered question and answer platform.

Online reference desk service from the Library of Congress.

Post questions to a community of millions of students and teachers. Get expert, verified answers.

Community providing answers to academic questions with tutoring and a searchable library.

Expert guides and how-to's that make complex concepts easy to understand.

Expansive database of how-to articles and videos.

Fact-checking site that rates the accuracy of claims on its 'Truth-O-Meter'.

Highly active question and answer site offering user-submitted answers on many topics.

Oldest and largest fact-checking site. Topics range from folklore to current events.

Visual explanations of important concepts in math, science, literature, and more.

Platform hosting nearly two hundred communities created and run by topic experts.

Educational content covering science, tech, math, humanities, and languages.

Collection of step-by-step guides covering almost every topic.

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