Lo que huelo (What I Smell)

Imagine traveling at half the speed of a jet plane without ever leaving the ground! Students will discover the technology that makes such speeds possible, from special tracks and safety precautions to aerodynamically designed trains. What are the limits to the speed of trains? What imposes those limits? Students also will read about the future of passenger train travel, from flying trains to trains that use huge magnets to levitate inches or centimeters off the track. Some trains safely reach speeds of more than 200 mph!

Addresses questions kids often wonder about, where there is usually no simple answer, offering different theories and opinions with examples and comparisons.

Immigrants help make the United States a special place. Learn all about the history of immigration to the United States as you sharpen your data measurement skills! This Spanish math book seamlessly integrates the teaching of math and reading, and uses real-world examples to teach math concepts. Text features include images, a glossary, an index, captions, and a table of contents to build students' vocabulary and reading comprehension skills as they interact with the text. The rigorous practice problems, sidebars, and math diagrams extend the learning experience and provide multiple...

En este cuaderno se estudian unas reglas muy útiles sobre el uso de la h y de la b. Se volverá a insistir en el uso de estas dos letras, especialmente en el cuaderno 13 (sobre la h) y en el 14 y el 15 (sobre la b). Se estudian también numerosas palabras de uso muy frecuente, con las dificultades -y /-yes, -z /-ces, -d /-des, y -cc, v y g.