¡Todo lo que mola de los tiburones y otras criaturas submarinas!

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!

A powerful and poetic play from the author of Death and the Maiden. A Man and a Woman in purgatory - a soul-less white room. Each is interrogated in turn by the other. Each is groping for forgiveness and contrition. But one of them has done something unforgiveable...

Basic concepts about electricity for highschool level and college. Topics include: Electrical circuits, Ohm's law, serial and parallel circuits, electric power, CD circuits, etc. With questionnaire.

Read Along or Enhanced eBook: Using helpful maps, charts, and intriguing facts in conjunction with vibrant images and informational text, this fact-filled, Spanish-translated nonfiction title allows early elementary readers to explore the lush rainforests of the world. Readers will learn make their way from the forest floor to the understory, all the way to the canopy!