Bob Garfield and Mike Vuolo don't know nuthin' about the double negative.     Twitter: @lexiconvalley Facebook: facebook.com/LexiconValley Email: lexiconvalley@slate.com     This week's episode is sponsored by The Great Courses and its series "Language A to Z." Order it at 80% off the original price by visiting thegreatcourses.com/lexicon.     Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at www.slate.com/podcastsplus.  

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