Which website had more than a million users after being four months in business, a growth rate higher than Facebook or Twitter in their earlier days? The answer, pleasantly, is the mammoth online educational company, Coursera , the brainchild of two Stanford professors, Daphne Koller and Andrew Ng. This immensely popular website offers free online courses, over 200 of them, with video lectures and assignments on topics ranging from computer science to humanities, taught by faculty members from more than 30 universities.
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