Try saying, "That exam was a piece of cake," to someone learning English and watch the look of confusion that comes from taking you literally. Fortunately for students of English-and their teachers-a CD-ROM product is now available to unlock the mysteries of the bizarre idioms we use. North American Idioms: An lnteractive English Language Learning Resource is true to its name-it is a fantastic interactive learning tool that is as engaging as it is instructional.