内容简介：
This colorful series introduces young readers to the development of familiar objects in their lives, from toothbrushes and skateboards to mobile phones and televisions. The simple text supports both the science and social studies curricula by combining scientific facts with biographical sidebars and descriptions of how people lived in the past. Archival images and contemporary photographs enhance the text and a time line on each spread allows readers to see at a glance how long it took to develop each object or technology.