Cathy Anderson tweets about Educah, a web site run by a student who is posting tutorials about whatever he/she is learning. From the “About” page:
Educah is not affiliated with any one college or university. The beauty of the idea is that it doesn’t have to be. All info I post on this site will site appropriate sources, or explain concepts that are free knowledge, like Gaussian elimination. Any examples used to reinforce material will be of my own creation, and not from any textbook/test/quiz what have you.
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