If you want to know how things really work ask Professor Mole. He will explain that the weight of an elephant makes a lift work and that it is rabbits pedalling quickly that makes a plane fly. Great tounge-in-cheek fun with wonderful pop-ups. And the climax is a spread where the reader has to find Professor Mole 50 times in his laboratory. Lift-the-Flaps and pop-ups throughout Turning wheel on cover Find 50 hidden Professor Moles on last spread.