Thanks to the book *Group Theory in the Bedroom*, by Brian Hayes, I finally found someone to blame for my geometry students’ daily growing hatred of mathematical language. His name is Robert Recorde. For those of you who, like pre-this-week me, have never heard of Robert Recorde, don’t worry: you’ve seen his handiwork. Recorde was a 16th-century Welsh doctor, mathematician, and author of *Whetstone of Witte* (1557), the book in which the modern equals sign first appears.

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