¿Por qué celebramos el Día de Martin Luther King Jr.? (Why Do We Celebrate Martin Luther King Jr. Day?)

Life in the Southern Hemisphere is bitterly cold for most penguins, but they don't seem to mind. Most penguins live in large colonies on the coast of Antarctica or on nearby islands. Readers explore penguin colonies for themselves, learning fun facts about these beautiful birds with the help of accessible text. Readers learn how penguin families work together to feed their young and keep them warm. A helpful graphic organizer aids in reader understanding. Readers will enjoy detailed images of penguin species at home in the Antarctic with every turn of the page.

El joven Von Neumann y la ciencia europea de principios del siglo XX. Von Neumann y las matemáticas en Gotinga. Su pensamiento científico. En los Estados Unidos. La actividad científica en los años cuarenta y cincuenta. Von Neumann y la ciencia del siglo XX.

Buenas decisiones examina cómo los adolescentes toman muchas de las decisiones de sus vidas; incluso decisiones que pueden ejercer un impacto grande en su futuro. No hay una fórmula «mágica» para hacerlo bien. Tomar buenas decisiones exige sabiduría, y en este libro los estudiantes aprenderán cómo adquirir más sabiduría y aplicarla en las decisiones que hacen.

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...