I didn’t invent Which One Doesn’t Belong. I’ve told the story of how I came to the idea many times (notably in the teacher guide to my book), but the origins lie here: Mine isn’t even the first book with this title. It does appear to be the first whose intention is to invite and welcome diverse perspectives—to take all true ideas about ways to categorize and distinguish, and to call them all “math”. As with all creative endeavors, I built on the work of others. I learned from it, polished and adapted it, and I offered it up to my colleagues in the hopes that they would use these ideas to inv ..read more