Mi libro gigante de máquinas

Algunas piezas denunciaban muy a las claras la existencia de una superchería; otras, en cambio, abrían un interrogante que aún no tiene respuesta satisfactoria. Desde entonces hasta hoy, la cuestión del Leyes ha estado sobre el tapete, apasionando a especialistas y aficionados, y adquiriendo, por momentos, caracteres de escándalo...». Francisco de Aparicio, 1937 «...Pero nuestros morenos casi no nos han dejado ni su recuerdo. Nuestra historia parece complacerse en olvidarlos, en evitarlos». José Luis Lanuza, Morenada.

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...

Teach students about the Declaration of Independence and the historical events that led up to it, with this Spanish-translated book. Readers will also learn what roles John Adams, Benjamin Franklin, and Thomas Jefferson played in the creation of the document. This book includes engaging images and text features to help readers better understand the vocabulary and social studies content.

This Title Explains What An Ecosystem Is And How The Plants And Animals Within An Ecosystem Rely On And Effect Its Existence. Different Types Of Ecosystems Are Described, As Well As The Food Webs Within Them. How Some Changes To An Ecosystem Can Be Good And How Some Harmful Changes Can Destroy Them. Teaches Students What An Important Role They Can Play In Keeping These Intricate Ecosystems Alive.