Desafíos matemáticos

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.

Updated for 2020, great photographs capture children’s attention as they read about different ways animals use their voices, ears, eyes, and mouths in this cute book.

Versión actualizada de una obra imprescindible. Con más de mil ilustraciones, creada por el artista plástico Mauricio Gómez Morin y textos del historiador Pablo Escalante Gonzalbo, este libro ofrece al lector 120 siglos de historia nacional. Un libro para toda la familia que está realizado con rigor histórico y científico, posee amenidad y es de ágil lectura. A través de él se pueden conocer 120 siglos de historia patria, desde una perspectiva histórica integral, en la que se entrelazan acontecimientos políticos y grandes cambios institucionales con datos provenientes de diversos...

Over the years, people have looked for ways to improve our imperfect sight. This has led us to the world of optics, which is the study of light and how it travels. What are some of these innovations that have changed how we see the world, and how do they work? Find the answers to these questions with this Smithsonian Informational Text! Created in collaboration with the Smithsonian Institution, this text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step...

"Dino" Don Lessem brings readers face-to-face with various dinosaur species, detailing their habitats, way of life and how they became extinct. An acclaimed dinosaur expert, Don Lessem has written more than 30 children's books, writes a popular dinosaur column in Highlights magazine, and was an adviser for Jurassic Park. Take a trip through dinosaur time to meet these sea giants face-to-face: The Archelon was similar to a turtle, but its shell was made of crossed rib bone covered in rubbery skin! The Mososaurs had huge pointy jaws and grew to be fifty feet long! The Ichthyosaurs looked a lot...