Círculos matemáticos

When a bird flies by a window or a car zooms by on the highway, we often wonder how fast the two objects traveled. This book explains the concept of speed to readers while showing them accessible ways to measure it for themselves. Learning the amount of distance traveled, and how quickly that distance was covered, is a great way to implement a variety of STEM topics while practicing this essential mathematical skill.

¿Qué tienen en común una tortuga marina, una iguana y una pitón? ¡Son todos reptiles! Conozca las características que comparten todos los reptiles. What do a sea turtle, an iguana, and a python have in common? They're all reptiles! Learn about the characteristics that all reptiles share.

Describes the impact of the Ford Model T automobile and the assembly line that built it on the automotive industry and American society, and recounts the life and career of their inventor, Henry Ford.

Discusses the discovery and escavation of King Tutankhamen's tomb and the myth of the curse that seemed to afflict those involved in the tomb's exploration.