Richard Ludlow started the nonprofit Academic Earth two years ago after M.I.T.'s OpenCourseWare helped him pass linear algebra as a Yale undergraduate. His site offers the courses of 10 elite universities — 130 full courses and more than 3,500 video lectures. Viewers can turn the tables on professors and grade courses. Other guidance includes "Editor's Picks" and "Playlists," lectures selected around a theme like "First Day of Freshman Year" and "You Are What You Eat."
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