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Brilliant Learning Interactive courses that teach math, science, and computer science through hands-on problem solving. Company Login Required Mobile App recommended MIT OpenCourseWare Learning Free lecture notes, exams and videos from MIT courses. Nonprofit Login Not required Mobile Supported Kaggle Learning A data science community with datasets, notebooks, competitions and short courses. Company Login Optional Mobile Supported Khan Academy Learning Free lessons from math to science Nonprofit Login Optional Mobile Supported OpenStax Learning Free, peer-reviewed textbooks for introductory college and AP-level subjects from a nonprofit at Rice University. Nonprofit Login Not required Mobile Supported DataCamp Learning An interactive learning platform focused on data skills, where lessons are completed by writing code in the browser. Company Login Required Mobile Supported Wolfram|Alpha Learning A computational engine that answers math, science and data questions directly. Company Login Optional Mobile Supported TED Learning TED's site for watching talks on a wide range of topics. Nonprofit Login Optional Mobile Supported CS50 Learning Harvard's introductory computer science course materials, available online. Nonprofit Login Optional Mobile Supported