Humans manage to invent new and useful things every day. But some inventions have changed the world. From the flush of a toilet to the launch of a rocket ship, this series will fully engage readers in the history, development, and current use of each life-changing invention. This series is at a Level 3 and is written specifically for transitional readers. Aligned to Common Core Standards & correlated to state standards. Dash! is an imprint of Abdo Zoom, a division of ABDO.