About 30 years ago I taught a series of summer enrichment programs for high school physics teachers, using funding from the Howard Hughes Medical Institutes. I deliberately chose teachers from smaller cities and towns who were unlikely to have contact with other physics teachers. One of my more interesting teachers came from a rural area in a far Midwestern state. He was teaching all of the sciences, including physics, and had never had a college course in physics. His technique was to have the students disassemble devices and analyze their operation.