Cosmeo (http://www.cosmeo.com), operated by the Discovery Channel, isn't free, but its interface is slicker with more multimedia features than free websites. Experts say there's a wealth of information here -- including a… search engine, an online encyclopedia, tutorials and a separate math area called WebMath. Cosmeo gets great endorsement for the quality of its reference content and math help, but it's not free, and recently reported staff cuts lead to questions about Cosmeo's viability.
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