I am a physics teacher with 20 years of experience. I have worked in various settings in the past -- as a researcher at Columbia University, as an MCAT course developer at Stanley Kaplan, and as a teacher. I have taught everything from 7th grade general science, to physics, to astronomy, to AP physics. Physics is the kind of subject where you don't know what you really think, until you have heard what you've said. Having a physics buddy to talk over places where you struggle in the curric...