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A growing number of colleges and universities are recording lectures and making them available free on YouTube or the iTunes Store. But it's hard to know where to go if you're looking for a lecture on a particular topic, like geography or philosophy.
The Open Culture blog offers a frequently-updated listing of links to online lecture recordings, arranged by subject. More than 250 online courses are included, covering about 30 academic disciplines. The collection is called "Free Online Courses from Great Universities."
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