Again, a very clean site with negligible ad presence. If you are in the mood to enlighten yourself and learn, or fill in the gaps on a college course you are taking, this is a free site that can help you. Open Yale Courses are offered, not for college credit, but simply to learn. I took a 1 hour class on classical music that was very interesting and informational. REASONS TO USE:  You enjoy learning  Negligible ads REASONS TO LOSE:  You don't like to learn.See positive reviews
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