商品簡介
Explains how simple machines, such as inclined planes, screws, and wheels and axles help to make work easier.
作者簡介
Gare Thompson has long been involved with children's books as an author and editor. He has written several of National Geographic’s Science Chapters and History Chapters, including Riding with the Mail: The Story of the Pony Express, Roald Amundsen and Robert Scott Race to the South Pole, and Serengeti Journey: On Safari in Africa. To learn more, visit garethompson-writer.com or follow @ThompsonGare on Twitter.
