Few occupations give you the opportunity to immediately change and improve someone's life, or to change their longterm potential. Doctors or paramedics come to mind. So do teachers. (And come to think on it... so does SF!)
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So true...
I spent a few years in the former Deutsche Demokratische Republik teaching English to people who worked in both public and business administration. When they were able to converse with me after I spent hours teaching them basic English skills it was a very rewarding feeling. Many of my students were in the East German Army the same time that I was in the U.S Army in West Germany. It was interesting knowing that we were once enemies at a former time. I drank a lot of beer with some of those guys.