La historia de los sistemas numéricos: Valor posicional (The History of Number Systems: Place Value)

[Plan Lector Infantil] Enrique y su hermano protagonizan una historia que podría haber pasado en cualquier lugar de la geografía colombiana. En medio de la inocencia de la niñez ellos deben enfrentar la realidad de un país que se debate entre la belleza, la riqueza, de sus paisajes y sus gentes y los conflictos que lo acosan, que los determinan cotidianamente. Los niños, sin buscarlo, se verán involucrados en un episodio que cambiará por completo sus vidas y las de sus padres, pero también les dará una lección: la realidad a veces no es como la pintan.

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

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.

Award-winning author Jorge Argueta treats young readers to a bilingual recipe/poem for the classic Latin American version of rice pudding with cinnamon. From sprinkling the rice into the pot to adding a waterfall of white milk followed by cinnamon sticks, salt stars, and sugar snow, Argueta’s recipe is both easy to follow and poetic. Lively illustrations by highly acclaimed Brazilian artist Fernando Vilela feature an enthusiastic young cook who finds no end of joy in making and then slurping up the rice pudding with his family. In Argueta’s world, cooking not only satisfies hunger with...