La fiebre del oro (The Gold Rush)

Our toilets toil away for us every day. Yet, they get little thanks for their hard work! When you think of toilets, you probably picture one in your home. But, toilets can be very different around the world. At first glance, a toilet is a simple device, but they are critical for proper sanitation. There are many people worldwide who do not have access to a toilet. Let's dive into an exploration of the history, importance, and inner workings of toilets! This Spanish book combines math and literacy skills and uses everyday examples of problem solving to teach subject area content. The...

Students will develop their math skills while engaged in reading about the importance of honeybees. This nonfiction math book combines math and literacy skills, and uses real-life examples of problem solving to teach subject area content. The full-color images, intriguing sidebars, practice problems, and math diagrams make learning place value relevant and fun. Text features include a table of contents, glossary, and index to increase understanding of math and reading concepts. An in-depth problem-solving section provides additional learning and practice opportunities while challenging...

Over the years, people have looked for ways to improve our imperfect sight. This has led us to the world of optics, which is the study of light and how it travels. What are some of these innovations that have changed how we see the world, and how do they work? Find the answers to these questions with this Smithsonian Informational Text! Created in collaboration with the Smithsonian Institution, this text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step...

La configuración de las mercancías en unidades de carga es un factor clave para asegurar la calidad en el transporte y la manipulación de las mercancías. Este manual reúne los conceptos fundamentales acerca de la formación de las unidades de carga para su traslado en todos los modos de transporte, con el fin de garantizar que alcancen su destino en el momento previsto, en óptimas condiciones y con el mínimo costo. Se definen los elementos que otorgan seguridad y estabilidad a la unidad de carga, los envases y embalajes, las tipologías de las cargas y los tipos de unidades de carga,...

What would happen if a polar bear and a grizzly bear met each other? What if they had a fight? Who do you think would win? Este lector de no-ficción compara y contrasta dos feroces especies de osos. Los pequeños aprenderán sobre la anatomía, el comportamiento y más de ambos osos. Este libro está lleno de fotos, gráficos, ilustraciones y datos increíbles.This nonfiction reader compares and contrasts two ferocious bear species. Kids learn about the bears' anatomies, behaviors, and more. This book is packed with photos, charts, illustrations, and amazing facts.

Explains, in simple terms, the reasons for skin color, how it is determined by heredity, and how various environmental factors affect it.

Gayo Plinio (siglos I-II a.C.), conocido como Plinio el Joven, pertenecía a la rica aristocracia italiana propietaria de grandes posesiones agrícolas y administradora de magistraturas municipales. El apoyo de su tío materno, Plinio el Viejo, que los acogió a él y a su madre a la muerte del padre y acabó adoptándolo como hijo, fue decisivo en la vida de nuestro autor. Plinio el Joven agrupó en torno a su persona el círculo cultural y político probablemente más importante de su tiempo, del que formaban parte ilustres escritores como Marcial, Tácito, ya en el cénit de su gloria, o...