Las Aves Rapaces

En El fascinante mundo de... los primates descubrirás cómo y quiénes viven en los árboles o a ras de suelo. Te intrigará el porqué unos viven casi en solitario, en familia o bien forman grandes manadas. Confirmarás que es muy práctico tener una larga cola prensil para colgarse de las ramas. O lo útil de la disposiciópn de los dedos en manos y pies para alimentarse y desplazarse o estar durante mucho tiempo colgado del pelaje de la madre... y muchas cosas más sobre su fascinante mundo.

Who were the earliest Americans? When, how, and from where did they enter and spread across the continent? And what is their relationship to modern Native Americans? Anthropologists develop theories to answer these questions based on the evidence they discover. Their theories—and the discoveries that prove and disprove them—are highlighted in this fascinating volume, full of awe-inspiring facts and incredible breakthroughs. Readers will feel like anthropologists and archaeologists themselves as they read about bones and artifacts, and what they reveal about the ancient cultures that roamed...

We love our pets. And our pets love us. Animals need lots of care. This engaging Spanish book teaches beginning readers how to take care of pets. Engage students in reading as they develop their early childhood literacy skills. With TIME For Kids content, this full-color book is aligned to state and national standards, and introduces students to simple informational text features.

Like the other Sasek classics, these are facsimile editions of his original books. The brilliant, vibrant illustrations have been meticulously preserved, remaining true to his vision more than forty years later and, where applicable, facts have been updated for the twenty-first century, appearing on a "This is . . . Today" page at the back of each book. The stylish, charming illustrations, coupled with Sasek’s witty, playful narrative, make these books a perfect souvenir that will delight both children and their parents, many of whom will remember them from their own childhood. In This is...

Planck consideró como tarea científica suprema la búsqueda de las leyes que rigen el absoluto, el invariante oculto en la realidad externa. Le cupo el privilegio de descubrir uno de esos elementos universales: el quantum de acción, la constante h.