teaching vs learning | it's about learning

I find a number of amazing educators struggle with the concept/implementation of PBL (high-quality, transdisciplinary Project-Based Learning). I believe some of that struggle is related to habit. I believe some is related to saying, “I teach English” (or math, science, etc.), instead of “I teach children,” or “I lead learning.” If you teach, how do you answer, “What do you teach?”