Putrefaccin y descomposicin / Rot and Decay

Provides a history of the city of Tenochtitlan, describes its eventual burial and rediscovery in more modern times, and details processes used in the excavation of the Great Temple.

Sesenta autores, desde catedráticos de universidad hasta estudiantes de Secundaria y Bachillerato, nos presentan los cuarenta desafíos que la Real Sociedad Matemática Española propuso con motivo de su centenario.Son cuarenta estimulantes retos que avivan el ingenio. Enfrentándose a ellos, el lector se sentirá un auténtico investigador matemático.Pero no hay que asustarse. No es necesario saber muchas matemáticas. La herramienta esencial para resolver los desafíos es pensar ordenadamente.

Ricardo the pack rat has collected so much stuff that his rat hole is full. Includes facts about pack rats.

A baby kangaroo is a joey. A baby hamster is a pup. Learn about baby animals with this full-color text that is filled with images of children's favorite animals. With simple sentences, this Spanish science reader simplifies scientific concepts for young readers. A fun and easy science experiment and Your Turn! activity extend the learning experience. Nonfiction text features include a glossary and an index. Engage young learners with this dynamic text!