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View Free Online Textbooks, Flashcards, Adaptive Practice, Real World Examples, Simulations | CK-12 Foundation outages and uptime

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 Reported Problems

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For 720d 3h 39m

(Mar 14, 2022 6:50:42 AM UTC)




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Mar 14, 2022 6:35:40 AM UTC

Lasted for 0h 15m 1s

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