Fantasmas de nuestra guerra

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther. This 6-Pack includes six...

Con materiales disponibles en cualquier hogar y sin necesidad de complicados aparatos, puedes realizar sencillos y divertidos experimentos que te ayudarán a entender mejor los distintos estados de la materia que compone nuestro mundo, en especial el agua, y cómo se comportan los objetos en ella. Estos experimentos científicos no entrañan ningún peligro y no requieren el uso de sustancias ni materiales especiales. Son fáciles de realizar y están dirigidos a los niños que ya han alcanzado un nivel aceptable de lectura comprensiva, a partir de los 10 años. Dentro de esta colección de...

Our senses help us discover things at the beach. Learn what you can hear, see, smell, and touch at the beach. Paired to the fiction title Wally and Molly Go to the Beach.

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.