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Mark: My name is Mark Halberstadt. Growing up I was really always a C student. I think I was really pretty much always pretty pitiful in school. I don't think I've ever gotten higher than a B plus in any math class ever, particularly. I pretty much thought that the only thing I was good enough to do in college was major in music. I went off and I got a music degree in saxophone, but I sort of almost felt it was more I was getting it because I was terrible at everything else. I worked as a saxophone player for a few years. Really what I wanted to do was do electrical engineering. The last thing that I remember completely not getting was trig identities, so I went to YouTube and I did a search for trig identities and Khan Academy was the first thing that popped up. Watched a bunch of videos in the trig playlist to kind of get caught up to speed. I watched all the videos in the calculus playlist, I watched all the videos in the physics playlist. I watched a bunch of videos on dividing decimals and even on subtraction by borrowing. I watched a lot of videos on arithmetic. That was in 2007. I did that until the fall of 2010. In the fall of 2010, I took a leap. I decided to go back to school and went to Temple University. Majored in electrical engineering, getting a second bachelor's. Keep in mind, I don't think I've ever gotten above a B plus in math classes and I was really a straight C student growing up. I just finished this year, first year back in college. I got a 4.0 GPA for the entire year. I got perfect scores on both of my calc final exams and also on my chemistry final exam. I ended both calculus classes, calc one and two, and chemistry with an average higher than 100%. There are some Khan Academy videos that I probably listened to the same concept over 20 or 30 times and there is no tutor in the world I could've paid to have sat next to me and repeated the same thing over 20 or 30 times without at least them getting a little bit judgmental, or at least them thinking, "Oh, well this guy really is never going to get this concept "and he should just give up." Where the understanding really happened was watching those videos and also working through the Khan Academy software and everything. The impact, for me in my life, I really see it growing exponentially over the next 20 or 30 years. So, from the bottom of my heart, thank you.