Atlas de especies en peligro

"Brief text introduces the concepts of long and short, comparing some of the world's longest animals with animals that are short -- in both English and Spanish"--Provided by publisher.

Koba el Temible –un libro de memorias, una crónica, una meditación sobre Stalin y su legado– es una continuación de Experiencia, la aplaudida autobiografía de Martin Amis. Es básicamente un libro político sin dejar de ser personal. Se centra en un importante punto débil del pensamiento del siglo XX: la tolerancia de los intelectuales occidentales ante el comunismo. Entre el personal comienzo y el final personal, Amis nos ofrece el mejor «cursillo» que se ha escrito sobre Stalin: Koba el Temible, lósif el Terrible. El padre del autor, Kingsley Amis, aunque manifestó tendencias...

In this stimulating, Spanish-translated nonfiction book, readers will discover the various types of friction--including rolling friction, sliding friction, fluid friction, and static friction--and the huge impact it has on nature, machines, and our lives. In addition, readers are encouraged to perform basic experiments to assist in the understanding of friction, kinetic energy, and water resistance. With real-life examples, colorful images, accommodating graphs and charts, and informational text, this title will inspire and engage children.

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.