$25 to $50

Kids First: Robot Engineer combines storytelling with hands-on building to introduce preschoolers to engineering fundamentals. Follow Ty and Karlie...

Welcome to the fascinating world of mechanical engineering! Make 8 motorized robots that move in different ways while exploring how each one uses g...

What's cooler than building a bot? Building 8 of 'em! A 48-page, full-color book guides the assembly, and a compact solar panel gives them power. T...