Since the beginning of summer I have been thoroughly watching and sometimes studying your DVD's. These are rare gems of teaching and treasures for hungry student minds, absolutely on par with the Walter Lewin freshman physics videos at MIT. I am a structural engineer from California, so you know what I've already been through. My daughter, however, is a 12-year-old 8th grader, currently watching your algebra and trig series while doing algebra II at the high school. She loves your videos.