“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.”