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I think a lot of people have already seen this video from last year, but if you haven’t, it’s well worth it! Erin McKean is a lexicographer who gives an entertaining and surprisingly funny overview of the descriptivist (as opposed to prescriptivist) approach to dictionaries and lexicography. It’s made for non-linguists, so it’s a good one to show to your non-TESOL friends and family who may be still stuck on the notion that “it’s not a word if it’s not in the dictionary.”