We love all the OpenCourseWare out there, it allows you to watch lectures from great schools and universities for free.
But it can be a bit lonely following it by yourself, and if you get stuck then there's no-one to help you.
Follow OCW allows you to discuss the lectures you've just seen, pose questions and test yourself with questions others have posed.
And just like most of the OpenCourseWare it's completely free.
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