As a teacher you are more or less obliged to pay the same amount of attention to everything. That can wear you down.
“I'm a professional geologist, an explorationist for oil. That's what I've done in my career, one that's culminated in - at least to this point - playing a part in finding the largest field in the last 40 years anywhere in the world. That's the Bakken field, which I believe will yield 24 billion barr”