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Mathematics and Physics:
1.  THE OHIO STATE UNIVERSITY USA student's comment: "... meant so much to me in helping me understand the coursework. Breaking down the load of concepts into small pieces allows me to see exactly where I am understanding, or not understanding, the concepts. I am a pre-medical student as well as a wife and mother of three, so I need a more targeted style of learning. ... have truly been godsends, I just can't say enough good things about them." 

2.  YOUTUBE Posted comment:  "I was watching some other videos for the last two days, mostly from KhanAcademy. I wish I would have run into your list of videos earlier. It's much more hands on and I love how you have one or two conceptual videos, then one or two example videos. Keep up the great videos."