El Movimiento por los Derechos Civiles en Estados Unidos (American Civil Rights Movement)

From the basic to the exotic, this how-to kit offers detailed directions for five bobby pin design's and includes wire, big and small bobby pins, seed beads, and specialty beads. Desde el básico hasta el exótico, este libro proporciona instrucciones detalladas para diseñar horquillas y incluye el alambre, unas horquillas grandes y pequeñas, y una gran selección de chaquiras.

Engineers have built some incredible things. But with every new feat, there is failure. Readers will learn about engineering feats like the Titanic, the Hindenburg, the Hoover Dam, and more in this engaging nonfiction title that has been translated into Spanish. This title features brilliant images, charts, and intriguing facts in conjunction with informational text and mathematic skills to keep readers active and engaged.

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

As they say, necessity is the mother of invention, and this book introduces readers to 14 women who invented very useful, helpful items. They include Chicago native Margaret Wilcox who invented the car heater, Indiana native Marion O'Brien Donovan who invented disposable diapers, Pennsylvania native Stephanie Kwolek who invented Kevlar, and Austria-born actress Hedy Lamar whose secret communications systems led to the creation of WiFi, Bluetooth, and GPS.