Carta del descubrimiento de Brasil

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!

Stephen F. Austin grew up to become known as the Father of Texas. Readers can learn about his interesting and incredible life in this appealing biography that has been translated into Spanish and highlights both Austin's life and Texas history. Through vivid images and illustrations, supportive text, an accommodating glossary and index, and fascinating facts, readers will learn about Texas pioneers, the empresario system, Freemasons, and how Austin became such an important figure in Texas history.

Manual de campo para descubrir aves y pájaros. Observar y reconocer las aves en su medio natural, en libertad, diferenciarlas por el color y forma de su plumaje, por la silueta que tienen en vuelo o por su canto es una experiencia magnífica para realizar en familia, durante cualquier estación del año y en cualquier lugar de la península Ibérica. Esta guía de aves y pájaros presenta las 50 variedades de aves más comunes en nuestros humedales, bosques y riberas de ríos y estanques, litorales marítimos y extensas áreas de diferentes cultivos agrícolas, así como en algunas zonas...

Wind Power: A waving flag, blowing leaves, a kite soaring through the skyall are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it in the future.