DK Eyewitness Books: Invention

The most trusted nonfiction series on the market, <i>Eyewitness Books</i> provide an in-depth, comprehensive look at their subjects with a unique integration of words and pictures. <p>A fascinating look at the world's earliest simple machines - wheels, gears, pulleys, and levers - to today's complicated telephones and plastics, <i>Eyewitness: Invention</i> presents the stories behind amazing inventions and how they changed the world.</p>