"Welcome," Khaat told the newest arrival. "Two extra points to those who introduced themselves as asked. However, onto the lesson for the day. We are about to discover, if some of you haven't already, that sometimes we do break things, either magically or through our own human frailties. It is helpful to be able to repair things. She took her wand and pointed it at one of the drinking glasses. "Waddawasi!" It hurled the glass through the air and broke it against the wall next to the chalkboard. "I am not teaching you how to break things. Rather, I am teaching you how to repair them.' "Reparo!" She pointed her wand at the shards of glass, and watched them reassemble into a functional drinking glass that she levitated to her hand. "Some of you may know how to do this already, and some may not. IF you demonstrate satisfactory skills with this, we shall move on to another charm. I have placed a number of drinking glasses here. Please come and get one and practice breaking it, either manually or magically, and reassemble them. Please do not break glass against, toward, or in the vicinity of, another student. I do not wish to have to take points for carelessness. Please get a glass and begin."