La represa de Itaipú

Describes how the rig was built, how it stands out in the water, and how much drilling it does in a day.

Si eres de los que piensa que saber que el tiempo y el espacio son en realidad lo mismo no sirve para nada, o que lo único que le puede decir un protón a un electrón es que deje de ser tan negativo..., ¡has dado con la lectura que necesitabas! ¿Sabías que el teletransporte es real? ¿Que a veces un electrón tiene probabilidades de atravesar una pared? ¿Que dos partículas pueden influenciarse mutuamente aunque estén a años luz de distancia? ¿Y que las partículas cuánticas son como Clark Kent y disimulan sus poderes cuando los científicos las están observando? En Cómo explicar...

With simple examples that are easy to relate to, this basic review of some of the building blocks of economics will help readers easily grasp the concepts. With language that is conversational without being too casual, readers are engaged throughout as they learn about not only these basic concepts but how they fit into the whole economic scheme of things, such as where goods come from. Readers will learn about the three factors of production, as well as what happens when resources are lacking and how that influences the entire economy.

Read Along or Enhanced eBook: Did you know that most animals in the world don't have backbones? Learn more about invertebrates in this engaging, Spanish-translated nonfiction book. Readers will learn all about mollusks, arthropods, arachnids, and crustaceans while being stimulated from cover to cover with its detailed images and charts, intriguing facts, and informative text.

Sharing is a social skill all children need to learn. This book presents sharing as a positive choice, then describes four ways to share. It points out that sharing goes beyond things: children can also share their knowledge, their creativity, and their time. What if they don't want to share, or someone won't share with them? These topics are covered, too. Concrete examples and reinforcing illustrationshelp children practice sharing, understand how and why to share, and realize the benefits of sharing.