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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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For 148d 0h 15m

(Jul 13, 2024 6:32:37 AM UTC)

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Latest Downtime

Jul 12, 2024 11:58:20 PM UTC

Lasted for 6h 34m 17s

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