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If you enjoy online learning, I recommend Open Yale Courses (OYC).
According to their website,
Open Yale Courses (OYC) provides lectures and other materials from selected YaleCollege courses to the public free of charge via the Internet. The courses span the full
range of liberal arts disciplines, including humanities, social sciences, and physical
and biological sciences.
----Registration is not required
----No course credit, degree, or certificate is available through the Open Course website