Material Detail

OpenAha is a free, open-source collection of 128 interactive courses (940 lessons) in mathematics, physics, chemistry and computing, from foundational topics such as ratios and linear equations to calculus, probability, quantum physics and computability. Each lesson is a short sequence of hands-on steps in which learners predict, drag sliders, run simulations and solve problems before the concept is explained, with immediate feedback and a worked explanation for every answer. Interactive models include projectile motion, circuits, the gas laws, Kepler orbits, the double-slit experiment, the Ising model, fractals and probability simulations. No login is required; progress is stored in the browser, and lessons work on phones, tablets and computers. Instructors can link students directly to individual lessons. The source code is openly available, and users can report errors or suggest improvements to any lesson step.

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