Los sólidos (Solids)

Readers will be amazed to discover that every time they climb onto bicycles and ride like the wind, they are defying gravity! This book explains the physics and history behind bicycles, skateboards, and surfboards. Readers learn what happens from the simplest movement of rolling forward to more complex tricks and stunts of jumping and spinning. Readers will never look at bikes, skateboards or surfboards the same way again.

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.

Readers may never expect that they might free fall to Earth, but if they have ever dived into a pool, that's exactly what they've done. This book shows readers how Newton's three laws of motion affect divers, skydivers, and mountain climbers' movements. Readers discover who uses gravity, and who works against it, and all other forces that contribute to a successful dive or climb. After reading this book, readers can decide if they will ever be interested in engaging in one of these extreme sports.

There is an amazing muscle inside your body. It pumps blood and keeps you healthy. What is it? Your heart! Read all about it in this colorful, Spanish-translated title.

B+En algunas personas, bajo las apariencias de una ramplona trivialidad, surge a veces la revelacion de las estructuras profundas de lo real.B; B+Las Tres graciasB; , B+El puenteB; y B+El burdel de las gitanasB; son tres relatos iniciaticos que, como otras obras narrativas de Mircea Eliade, estan estrechamente ligados a sus estudios sobre religion y mitos. Sus personajes, entre la memoria y el sueno, transitan las melancolicas calles de Bucarest o recorren los paisajes rumanos en busca de una respuesta a la existencia y sus misterios.

Las redes sociales hoy son parte normal de la vida, en especial durante la adolescencia, y los teens y no tan teens que viven sumergidos en este mundo necesitan ayuda para aprender a navegarlas. Esta es una guía con excelentes consejos para ayudarles a hacerlo con inteligencia para proteger sus mentes y corazones ya que un gran número de situaciones “en redes” pueden enredarlos y poner en riesgo su integridad emocional, social, espiritual e incluso física.

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

La infancia y los primeros pasos en el mundo de la música de seis compositores geniales, contadas con sensibilidad y acompañadas de dibujos y fotografías. Un recorrido lúdico a través de su música y un CD por libro con la narración del texto y algunos fragmentos musicales de las obras más célebres de estos compositores.