Bolitas y palitos

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!

Examines the nature of inclined planes and wedges, how they can reduce the amount of force necessary to perform work, and ways in which they are used.

Luci ha decidido cazar las moscas que, zigzagueando entre las páginas de su cuaderno de tareas, le impiden concentrarse. Usará una red tejida con palabras y silencios: la red de sus versos. Poco a poco, los insectos que la niña atrapa en su poema invaden su imaginación: la radio zumba, su hermana es una larva, las gafas de su abuela son ojos de múltiples facetas; ella misma sabe volar, transformada en mosca de alas frágiles por el poder de la poesía. Los versos de este poemario zumban y cabriolean, invitando al lector a acompañar a los insectos - y a Luci - en su vuelo caprichoso.

How do you truly engage students in learning history? When students make personal connections to the subject, they’re much more motivated to learn. This Spanish book provides firsthand accounts of history that give personal insights into historical events. Students will learn about the culture, history, and distinctive features of the Lakota, Cheyenne, Comanche, Pawnee, Osage, Omaha, and Crow tribes. With a visually appealing layout, this book features captivating text, fun facts, sidebars, and time lines that help students grasp the essential concepts they need to know at their grade level. ...