"What exactly is a robot? How do they talk and move? And what doeses it take to build one?"-- The fifth book in a nonfiction early-reader series about the science of robots starring Ada Twist, Scientist! What exactly is a robot? How do they talk and move? And what does it take to build one? Ada Twist, The Why Files is the perfect nonfiction resource for all these questions and more. Based on the bestselling Questioneers series and the Ada Twist,...