Criptología digital (Digital Cryptology)

When winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

La publicación del primer volumen de esta serie sacudió al mundo y les mostró a las Niñas Rebeldes de todo el planeta que no hay fronteras ni límites para que cumplan sus sueños y sean lo que quieran ser. Y, para que siga la rebeldía, hemos preparado para ellas esta edición con la historia de cien colombianas y ecuatorianas extraordinarias. Junto con un grupo de talentosas ilustradoras, investigadoras y escritoras recolectamos las historias de mujeres de Colombia y Ecuador, de todas las épocas y profesiones, para rendir homenaje al gran legado de rebeldes que ha levantado la voz para ...

Quick Minds is an exciting, six-level course for young learners in Spain that enhances your students' thinking skills, sharpening their memory while improving their language skills. The Activity Book mirrors the content of the Pupil's Book. It practises the core vocabulary and grammar and consolidates skills development, with a variety of exercise types. 'Do that!' sections provide opportunities for speaking, while the Review and Culture sections provide extra listening practice and 'Get it right!' pages cover problem areas for Spanish speakers. A Grammar Practice section at the end of the...

Provides information on the history, geography, society, industries, transportation, environment, and culture of Argentina, Chile, Paraguay, and Uruguay.