Abejas (Bees)

"Amphibians have some of the most interesting life cycles on Earth. The metamorphosis frogs, toads, salamanders, newts, and caecilians go through has many steps that readers need to understand and remember. This book offers a concise overview of the general amphibian life cycle as well as representative examples of the many species within the animal group. Most importantly, the accessible language is paired with diagrams of the steps of the life cycle to augment readers' understanding of this topic often found in the science curriculum."

Life on Earth depends on carbon. In fact, about 18.5 percent of a human body's mass is carbon. How carbon is taking in and given off through animals' breathing, the burning of fossil fuels, and more can be shown in the model known as the carbon cycle. Though this concept can be confusing, all readers have a chance to understand this concept through the text and simple diagrams in this book. Both struggling readers and those looking for review can find the most important components and vocabulary of the carbon cycle in low-level, accessible text.

"Contando historias los seres humanos podemos festejar los hondos dolores de la vida." GUILLERMO ARRIAGA Retorno es una calle del caótico y potente México D. F. donde se entrecruzan las pasiones y la supervivencia de sus habitantes. Sus historias abrevan de los dos grandes mitos de la literatura: el amor y la muerte, y están pobladas de personajes contradictorios. Unos ocultan lo que son, otros actúan desde convicciones inquebrantables y los más conviven con la más terrible violencia, entre la búsqueda y el descubrimiento, entre la dignidad y la caída al abismo. Por encima de todo,...

Una guía que lleva a los niños por una maravillosa aventura: los conceptos económicos. En esta libro los niños aprenderán cómo manejar su dinero, descubrirán los secretos de las finanzas y adentrarán en el fascinante mundo de la banca.

In 1846, travelers heading for California became trapped high in the mountains of the Sierra Nevada. Snowdrifts surrounded their shelters, and food supplies dwindled. How they stayed alive remains one of the most gruesome stories in US history. However, some facts that have come to light recently through archaeological digs will surprise even those who think they know the story. This gripping book, including maps and images of the era, tells the true account of the doomed Donner party.

For ages, the idea of machines that think and act on their own has gripped scientists, thinkers, and the general public. This book explores the history of artificial intelligence (A.I.), and how science fiction is quickly becoming science fact. It examines the technologies involved in A.I. and its inevitable effects on work, life, health, and many other aspects of human society. Rooted in history and science, this book provides an inside look at a topic that captivates engineers, scientists, and dreamers, but also raises important ethical issues and challenges how we see ourselves and our...