Criptología digital (Digital Cryptology)

Today is Mauro's Birthday. Everything is ready for the celebration; his friends have a lot of presents for him.

Un virus muy dañino llama a la puerta de los humanos y en muy poco tiempo cambia el mundo por completo. Todo es soledad, silencio, confinamiento. Hasta los animales echan en falta a los niños, sus juegos, sus risas... ¿Será capaz la humanidad de adaptarse a esta nueva situación y, unida, luchar para recuperar la vida? Esta historia refleja todo un año de pandemia y, a su vez, es un canto de esperanza y fuerza.

Our toilets toil away for us every day. Yet, they get little thanks for their hard work! When you think of toilets, you probably picture one in your home. But, toilets can be very different around the world. At first glance, a toilet is a simple device, but they are critical for proper sanitation. There are many people worldwide who do not have access to a toilet. Let's dive into an exploration of the history, importance, and inner workings of toilets! This Spanish book combines math and literacy skills and uses everyday examples of problem solving to teach subject area content. The...

Martín De León was the only Mexican empresario to found a colony in Texas. This book also details De León’s integral role in the development of the cattle industry, along with other accomplishments that have made him a compelling figure in Texas history.