Agujeros negros (Black Holes)

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.

Mathematics constitutes ideal material for exercising the art of learning and thinking. For this it is necessary that the classroom has a stimulating atmosphere which requires determined attitudes and beliefs. The book combines theory and practice and responds to questions such as these: to think in the mathematics class? on what does the knowledge of solving problems really consist of? what are the beliefs and which are the most common ones among the students? how to diagnose, evaluate and, in some cases to modify, the systems of beliefs of the pupil?).

"Breve explicación del propósito y uso de este libro. Antes que nada, lo primero que debemos dejar bien claro es que este Libro no es, en modo alguno, un diccionario lingüístico. Esto, que a simple vista pareciera ser contradictorio, ciertamente no lo es, ya que ni por su forma ni por su contenido ha pretendido regirse por las normas o modelos tradicionales de los diccionarios que todos conocemos y usamos; y porque además, siendo radicalmente honestos, no ha sido escrito por alguien que pretenda asumirse como lingüista (por lo menos, no un lingüista como algunos que conocemos ), ni...

This book teaches readers about how the moon reflects the sun's light, and why the moon seems to change shape throughout the month. The book is complete with labeled images when needed, simple text, and more facts. Aligned to Common Core Standards and correlated to state standards. Abdo Kids Jumbo is an imprint of Abdo Kids, a division of ABDO. Translated by native Spanish speakers--and immersion school educators.

Esta antología encierra en todas sus páginas toda la sensibilidad y la curiosidad de un hombre que sabe contar historias y que utiliza la poesía como medio para transmitirlas. José Hierro escribe sus poemas con palabras sencillas que suenan como una composición musical porque para él la poesía no es presumir con imágenes de listillo.