MOOCs are great aren't they?
Also if you want something brain-rich without the commitment to a course have a look at The Open University's open learn site where you can find tons of interesting material including background to many of the TV programmes they co-produce and additional information in the form of articles, interactive explorations, quizzes etc.
http://www.open.edu/openlearn/
Also if you want something brain-rich without the commitment to a course have a look at The Open University's open learn site where you can find tons of interesting material including background to many of the TV programmes they co-produce and additional information in the form of articles, interactive explorations, quizzes etc.
http://www.open.edu/openlearn/