Back in my days as a data processing instructor, I had a retail marketing student in my Introduction to Data Processing class. She had straight "A"s since kindergarten until I gave her her first "B". [The fact that she was the daughter-in-law-to-be of my wife's best friend helped insure that I knew all the facts.] As she later admitted, she couldn't see any use in learning to design a database for a marketer.
Every year following her graduation until I moved on to a new job she returned to my class to tell my students about her first retail job: which included designing an inventory database. She said that it was her way of saying thank you for forcing her to learn something she didn't want to learn.
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I have been lucky because I've had a lot of students make contact with me after graduation. I think that I will share more of these; not because I think that I'm a great teacher, I'm not (or maybe I think most teachers are great teachers) but to encourage other teachers who don't teach adults.