6. Academic Earth
If you’d like a broader collection of courses than MIT provides, Academic Earth is a great place to look.
This free course aggregator has a stunning collection of courses from around 50 universities across the globe. You can search by source or general subject.
Don’t miss the curated playlists on topics such as natural laws, the nature of evil and the economic crisis.
The video electives—with subjects like how to take a punch and why World War II made us fat—are lots of fun, too.