I have ph.d. in physics and finishing up ph.d. in math so I am good in both subjects.

Back when I was learning those subjects, I was puzzled for a long time about various things that the books didn't seem to explain and I was really excited when I finally answered my own questions. It has been a daydream of mine to write my own textbook where all the material is presented differently and all those questions are answered from the outset. While in practice I don't have time to actually write my own book, I do have various ideas on how to teach the material differently and I am excited to see this help students.