Darian Rojas: La realidad detras de la fantasia

Defines pulleys, explains their functions, and suggests simple experiments to demonstrate how they work.

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

Mars is perhaps the most thrilling planet these days. With rovers exploring its surface and manned missions in the works, people are wondering if Mars is our next home! In this highinterest book, readers will learn more about Earth's neighbor, including what its climate and surface are like, why it's called the Red Planet, and about the recent discovery of water on its surface. They'll learn all this while solving "Your Mission" math problems that complement and support the text. This motivating volume is an engaging way to explore key aspects of science and math curricula.

El amor que sentimos por “el tigre que come de la mano”, como se ha llamado en Japón al más doméstico de los felinos, no es un fenómeno reciente. Venerado por los antiguos egipcios, compañía silenciosa de artistas y poetas, de magos y de brujas, adorado por igual en Oriente y Occidente, en todas las épocas y las culturas el ser humano le rindió culto al gato e intentó dar cuenta de su belleza y misterio. ¿Qué los vuelve seres tan especiales? ¿Por qué nos fascinan tanto? Con enorme gracia y erudición, Carl Van Vechten explora aquí la figura del gato en la literatura, la...