The Khan Academy

The Khan Academy might be considered the world’s first open-source university, or library, or classroom. Whatever you want to call it, the site, which has posted more than 2,000 instructional videos — ranging from basic algebra to banking, biology and brain teasers — is an amazing resource for those looking to further their knowledge base.

Topics of study include: math, science, test prep, and the humanities. Personally, I’d love to see them include some liberal arts 2.0 topics of interest.

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