Dólares y centavos ebook

Reptiles y anfibios is one book in the Spanish-language Gran Atlas de la Ciencia series that covers today's most popular science topics, from digital TV to microchips to touchscreens and beyond. Perennial subjects in earth science, life science, and physical science are all explored in detail. Amazing graphics--more than 1,000 per title--combined with concise summaries help students understand complex subjects. Correlated to the science curriculum in grades 5-9, each title also contains a glossary with full definitions for vocabulary.

El siglo XIX definió, tal vez, lo que más tarde sería el México contemporáneo. En esta época, no solo se desarrollaron las más importantes batallas, tanto militares como ideológicas, sino que también surgieron modos de hacer, pensar y sentir que hoy siguen vigentes. Sumérgete en las páginas de este libro y descubre las diferencias y similitudes de la vida de entonces con lo que sucede en nuestros tiempos. Te sorprenderás de aquello que desde hace mucho es cosa de todos los días.

Surveys the life of the American statesman, lawmaker, writer of the Federalist Papers, and first secretary of treasury under George Washington.

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...