Travel from 3500 b.c. to modern times in this engaging look at 45 amazing inventions. From the axe to the laser, the profiles of each invention explain the idea and how it works, the inventor, the immediate impact, and its technological "children." Complete with an epilogue that looks to the future and an index of Web sites for further learning, this amazing book will inspire your young inventor's dreams. Favorite Features Arranged for easy reference, this resource introduces historical concepts and encourages a respect for science.