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In middle school my foreign language choices were Spanish, French, or Latin. I picked Latin because it was cool. When it came time to talk about subordinate clauses and noun cases in English, Spanish, and French, what I'd learned in Latin was invaluable. It's like learning a purely functional style programming language versus an imperative one: they'll both inform how you think about solving problems in the other. Getting really good at another language is good because it makes you better at thinking about grammar.