Kathy & Ross Petras are a sister and brother writing team who’ve written several popular “word nerd” books, including the New York Times bestseller You’re Saying It Wrong, That Doesn’t Mean What You Think It Means, and the soon-to-be-published Awkword Moments. They do a biweekly podcast—a kind of “Car Talk” about words—with NPR’s KMUW called “You’re Saying It Wrong.” They are longtime logophiles, proud polymaths, and (they must admit) sometimes annoying grammar pedants (but they try to restrain themselves …).