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Real textbook questions, rebuilt as experiments and challenges. Discover the ideas, learn the language, and ask for another exercise whenever you want.

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An Introduction to Cybernetics

W. Ross Ashby · 1956 / 1957

Build machines, uncover hidden rules, transmit information, and design regulators. Includes clickable terminology, concept comparisons, and the full textbook.

14 chaptersPractice & experimentsLinked glossaryProgress saved on this browser

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All 9 chapters · independent adaptation

Evidence Lab

Based on OpenIntro Statistics, 4th edition
David Diez · Mine Çetinkaya-Rundel · Christopher Barr

Choose samples, explore chance, test claims, and fit models. Work with live distributions, uncertainty intervals, and residuals while learning the book’s vocabulary.

9 chaptersInvestigations & practiceConnected glossaryProgress saved on this browser

Start investigating ↗Read the textbook PDF ↗

Learn it byworking it out.

An Introduction to Cybernetics

Evidence Lab

Learn it by
working it out.