Curiosity

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.

Ésta es la historia de Abul Qasim, el médico del califa Abderrahmán III. Abul operaba cataratas, hernias y bocios; hacía traqueotomías, trepanaciones, amputaciones y, incluso, intervenía cólicos misereres.

Five and counting! So far, astronomers have discovered five dwarf planets in our solar system. Pluto, which was once thought of as the ninth planet, is today classified as a dwarf planet. This book looks at the current dwarf planets, characteristics, size, and orbital patterns, as well as the three rules scientists follow to characterize these tiny, round space objects. Every day new discoveries are being made. Who knows how many dwarf planets we will find in the future! This book will allow students to understand that patterns in the natural world can be observed, used to describe phenomena, ...

El objetivo de este libro es ofrecer una herramienta de trabajo práctica para el técnico, de forma que al exponer las diferentes acciones técnicas, tácticas y cualidades físicas no se pretende definir el concepto de las mismas sino concretar los objetivos que debe perseguir el entrenamiento de cada una de ellas. El libro se centra, fundamentalmente, en tres aspectos: -Fundamentos del programa. Parte de esta exposición detalla los objetivos y consideraciones que deben tenerse en cuenta en la mejora de cada una de las acciones. Este conocimiento es importante ya que para el técnico no...