My degrees are in engineering and applied physics, and I had a long career in physics  research at GE and teaching physics and chemistry of materials at MIT. Throughout the 20th century, most of my writing  was for fellow scientists, except  for one  town history (Glenville – Past and Present, 1970) and one popular-science book (Driving Force: The Natural Magic of Magnets, Harvard, 1996). (Some say that "popular science" is an oxymoron, but it shouldn't be!)