An informative, entertaining compendium explaining the physical principles behind everyday technology unfolds one-and-two-page captioned visual explanations organized in four sections: Mechanics of Movement; Harnessing the Elements; Working With Waves; and Electricity and Automation. A fictional great wooly mammoth, several winged angels and other humorous devices add a dimension of whimsy without blurring the clear distinction between fantasy and fact. (Age 5-adult)