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CK-12 Foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history

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Great site, free knowledge supporting. came to this site through One tracking cookie found by google analytics.
This site, which offers free educational materials, many of which are used for MOOCs, is well organised and a boon for the self learner. You can download books or even make up your own text book, plus there is a growing wealth of other learning aides and links to similar sites.

Safety Rating Breakdown

Good site


91 / 100

Child Safety

92 / 100