Spiders Up Close / Las aranas

Aunque los estudios de Bachillerato completan, en sí mismos, una etapa de formación, es indudable que en la mayoría de los casos son paso necesario hacia otros estudios de rango universitario. Este libro ha sido diseñado para abarcar esa doble finalidad. Por una parte busca ser un complemento de lo explicado en el libro de texto o en la clase; desea, por otra, ser una ayuda en ese tránsito intermedio entre el Bachillerato y los primeros cursos de Facultades y Escuelas Universitarias.

Interesting facts and experiments explore the dynamics of a race car engine to teach about air flow and drag, safety equipment and roll cages, the fuel system and horsepower, suspension and track bars, internal combustion, why race cars don't have speedometers, how roof flaps are designed like airplane wings, and more.

What’s the difference between a seal and a sea lion? These “second cousins” of the sea look similar, but there are many ways to tell these creatures apart. From ear shape to the noises they make to communicate, seals and sea lions are amazing creatures with both shared features and many truly unique attributes. They both share an ocean habitat, but when readers take a closer look, it’s easy to discover how they each fight off predators, mate, and raise their young in different ways. Captivating full-color photographs help to bring these marvelous mammals to vivid life.

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.