Método de los relojes

Unlike their domesticated relatives, wild turkeys can fly. Readers will learn about the pecking order of turkey flocks, how turkeys avoid predators, what foods these birds eat, and much more. The turkey’s association with Thanksgiving is addressed, as is the impressive comeback these birds made after their numbers plummeted in the early twentieth century.

La brillante y conmovedora historia del pueblo estadounidense para lectores de escuela intermedia y secundaria, ahora revisada y actualizada para el centenario del nacimiento de Howard Zinn. La historia del pueblo de Estados Unidos para jóvenes cuenta las historias de obreros, personas esclavizadas, inmigrantes, mujeres, personas negras, latinoamericanos, asiaticoestadounidenses, indígenas estadounidenses y otros que comúnmente son excluidos de libros de texto pero que constituyen parte de la fuerza impulsora de la historia de nuestra nación. Comenzando con un vistazo a la llegada de...

Desastres naturales (Natural Disasters) is an exciting book about how estimations and predictions help save lives in natural disasters. Students will learn critical math concepts as they are engaged in reading about the properties of natural disasters. Practice problems and mathematical diagrams help students reinforce the importance of mathematics. This Spanish title includes a glossary, an index, engaging images, and easy-to-read text to help students build their math and reading skills.

Black holes are neither holes nor black. They're invisible and packed with matter! Future astronomers will find out many more fascinating facts about these space phenomena with this intriguing book. Carefully crafted text encapsulates the most important information about black holes, such as how scientists locate them and their significance in a star's life cycle. Amazing photographs support critical concepts and inspire a true appreciation of the spectacles of space.