In a round about way, just about everything with the exception of geography.
As an engineer, Math and English skills are key, but speech skills are important for working with other individuals. Economics gives me a point of view when designing certain mechanisms ( like points / awards ).
Humanities ( ethnic studies, family studies, art, etc ) allow me to better understand and relate to other people, which is important when working in a culturally and ethnically diverse environment.
All of these subjects inform my thought process as I set out to solve various problems.
With that said, however, I'm currently in a place where I think to myself "Man, I'd love to use X, and wish I had studied it harder in school." Higher levels of Math, specifically. At the time ( high school ) I just didn't see the value of any class of Math beyond Algebra.
Granted, at the time, teachers couldn't or wouldn't really answer the great teenage question "When am I ever going to use this stuff," and I might have made better decisions if I had, but the responsibility is ultimately mine.
I'm back in school now to pick up the skills I'm lacking, but recommend doing it right the first time.
English
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Then you did Geography wrong (Or perhaps you were taught it wrong) It's a diverse subject, particularly as you enter higher levels of Academia, covering Environmental, Political, Economic, Cultural phenomenon or ideas and ideologies.
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You're right, it is a diverse and fascinating subject, but my knowledge base in Geography is simply far too narrow for it to drive my daily operation, which is what I understood the question to be referring to. Unfortunately, an amateur understanding of weather systems and how Geography affects / is effected by them just doesn't enter into my daily operation. I never studied Politics from a Geographic perspective, so I don't have that knowledge to inform my daily actions. I by no means meant to suggest that Geography is useless, only that I don't use it on a daily basis. I suppose I could have made the distinction, however.
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No your distinction was fairly clear - It's just that i'm doing a Masters in Human Geography, so like to sing the praises of the subject when I can.
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Aha :p I actually thoroughly enjoyed Geography, and was quite surprised when my professor enlightened us as to the reach of the subject. Sadly, I'm unable to explore the subject further at the moment, as I have responsibilities ( wife, kid, job ) and need to prioritize which classes I take :)