Primeros Ejercicios de Calculo

Torcuato, apodado Trescuartos por su aspecto físico diminuto y escuálido, comparte su vida con un hermano gemelo que posee muchas de las cualidades que a él le faltan y con el que lo comparan continuamente. Él cree que no puede tratarse de alguien normal y sospecha si Luis no será, en realidad, su ángel de la guarda, desde el día en que desaparece de su lado y todo comienza a salirle mal.

If you have ever dreamt about becoming the next Mark Todd or Zara Phillips, then How to ... Horse Ride is the perfect guide to set you on course for success. This book shows you 'how to' with simple step-by-step photographs and easy-to-follow instructions. From basic exercises and grooming techniques to more advanced cantering and jumping. The final section takes a look at the fun you can have with your riding, from the thrill of the show, to the discipline of dressage. Saddle up and learn to ride with this exciting new How to.... You'll be galloping your way to the gymkhana before you know...

Learn more about the renowned British scientist, professor, and author who spent his entire career trying to answer the question: "Where did the universe come from?" Stephen Hawking was born exactly three hundred years after the death of the scientist Galileo, so maybe it was written in the stars that he would become a famous scientist in his own right. Although he was diagnosed with a neurological disease at age 21, Stephen did not let the illness define his life. Known for his groundbreaking work in physics, and identified by his wheelchair and computerized voice system, Stephen continued...

¡Descubre a Olivia, la protagonista de una serie de cómics repleta de aventuras, misterio, acción, personajes divertidos, un toque de magia, ecología y mucho humor! Con lo tranquila que estaba Olivia en la ciudad, y a sus padres les ha dado por mudarse a un pueblo en la montaña, en mitad de la nada. Y todo porque su madre tiene que salvar a la región de una devastadora invasión de pájaros gigantes. Qué rollo de verano, por aquí no hay nada con lo que entretenerse... ... Salvo una misteriosa pastora y sus lanosos perros lanosos, un par de monstruos y un genio sivergüenza. ¡Parece...