Experimentos sencillos sobre el tiempo

¿Y si el universo no pesara nada y la materia no existiera realmente? Lo que parecería ser una duda legítima para un erudito místico de los Vedas Indios es, en cambio, un resultado embarazoso de la aplicación de la Relatividad Restringida a las observaciones obtenidas por un grupo de astrofísicos, que han medido la radiación cósmica de fondo de nuestro universo. En los albores del nuevo milenio, el satélite WMAP, más allá de proporcionarnos una medida del cosmos, nunca antes obtenida, ha creado bastantes quebraderos de cabeza respecto al concepto de universo, en el que todavía hoy ...

The art of glass blowing has been around for over 4,000 years! Readers explore the history of blown glass, the tools and equipment that is used, and how it is still practiced today in this engaging, Spanish-translated nonfiction title that features vibrant images and informational text.

Take a look inside this book and you'll discover four delightful jigsaws specially designed for tiny hands, with each jigsaw piece that has touchy-feely textures that will help to develop sensory awareness and the concept of matching.

María José grieves at the loss of her mother who died in childbirth. She has difficulty sharing her feelings with her father and the distance between them grows with the appearance of a new woman. Her father gets another job which forces them to move to another neighborhood. The new house is small, but is near an ice cream store owned by Mr. Beto. In the store, María José makes friends with girls and boys her own age, but also meets Mr. Beto and his friends. María José and her friends try to help Mr. Beto when he comes down with a sudden illness.