http://ocw.mit.edu/courses/audio-video-courses/
http://www.onlineuniversities.com/blog/2008/11/100-awesome-ivy-league-video-lectures/
http://mycourses.med.harvard.edu/public/
http://www.snow.or.kr/code/sfun/pure_sciences/?&cline=170
http://www.snow.or.kr/lecture/pure_sciences/physics/1078.html
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