Matemáticas en el cinturón de asteroides (Math in the Asteroid Belt)

This is a hopeful conservation story about an endangered family of Mexican gray wolves who live in a sanctuary in the Pacific Northwest and their journey that leads to their successful release to the wild in Mexico. This nonfiction story, illustrated with color photography, follows the lives of a Mexican gray wolf family, known as lobos, with pups born at a sanctuary in Washington State near Mount Rainier, to their release into the wild in Mexico. Through this hopeful and engaging story of conservation, kids learn about wolves--their characteristics and behavior--and the challenge of...

[English]Why do maple and oak trees drop their leaves in the fall? What other animals share the forest with chipmunks, deer, and snakes? Hike through this book, and find out what makes temperate deciduous forests one of Earth's treasures. [Spanish]¿Por qué al arce y al roble se les caen las hojas en el otoño? ¿Qué otros animales comparten el bosque con las ardillas listadas, los venados y las serpientes? Da un paseo por este libro. Descubrirás por qué los bosques templados son uno de los grandes tesoros de la Tierra.

¿Sabías que la forma tubular del submarino lo ayuda a moverse más rápido por el agua? Los tanques de lastre lo ayudan a hundirse o flotar. Aprende más datos fascinantes en Los submarinos, uno de los libros de Máquinas militares poderosas.

Describes the frogs, toads, and salamanders of Mexico's Yucatan Peninsula, looking particularly at the wide variety of adaptations found in the few species that dwell there.