One of massive open online course websites that offers a variety of undergraduate- and graduate-level online courses for free. They constitute an entire set of video lectures, lecture notes, problem sets, and exams, and are taught by professors at the world’s leading universities. Those who are going back to school after years away from it like me or those who want to explore subjects other than majors so as to gratify intellectual curiosity may find this useful or entertaining. (from my Facebook post added on May 27, 2014)

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