I'm posting without reading any previous posts in this thread save the first one. Affecting the world with a social science or humanities background: one large area is public policy. There are also applications in business, education, and I'd say every facet of life. It is not something that is an application in and of itself like engineering, but is incredibly useful.
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"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions." - Albert Einstein
"Wise men talk because they have something to say; fools, because they have to say something." - Plato
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