Tras las huellas del ADN

The use of calendars dates back thousands of years. Why are we driven to record time, and what would happen if we did not? Who created the concept of calendars? Why do different cultures use different calendar systems? And why are calendars so important to us? It is about "time" we found out! Created in collaboration with the Smithsonian Institution, this Spanish-translated Smithsonian Informational Text builds reading skills while engaging students' curiosity about STEAM topics through real-world examples. Packed with factoids and informative sidebars, it features a hands-on STEAM challenge...

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?).

�Puedes creerlo? Han pasado 25 a�os desde que nuestro hombrecito con sombrero de copa primero parti� a ser un fen�meno en todo el mundo! Sin embargo, todav�a se ve con su rostro fresco como siempre! Aun as�, durante este tiempo, Wally aprendi� algunos trucos astutos y nuevos sobre el arte de desaparecer... Esta es una nueva edici�n de b�squeda cl�sica para celebrar, ahora con diab�licos rompecabezas y un nuevo y asombroso arte. Lleno de extras fant�sticos, cubierta con solapa espectacular, desplegables nunca-antes-visto, y una lista para marcar. Este libro nos trae el...

"Despega hacia el espacio en esta aventura interactiva basada en los alunizajes del Apollo. Desde el despegue del cohete hasta el regreso a la Tierra, este libro de no ficción con solapas y lengüetas despertará la curiosidad de los más intrépidos. ¡Un gran mundo puede ser pequenño!"--Casadellibro