" Uh-oh," Moni sang, and nodded her head in Chantal's direction. " I think someone's a wee bit upset with us." She turned and walked a few steps backward." Careful," I said. " We're not out of range." " Have no fear, Super Brain is here." Moni whipped out her calculator, holding it up like a shield." What are you going to do, daze her with denominators?" " Maybe. But first I'm going to pummel her with my Pythagorean theorem. "