La tumba tenebrosa

Describes tornadoes, how they form, and the tools scientists use to predict them--in both English and Spanish

The American Civil Rights Movement of the 1950s and 1960s marked a shift in how African Americans were treated in the United States. This volume highlights the important events and figures that made this movement successful. The book introduces readers to important activists who fought for civil rights by raising their voices and refusing to accept unfair laws. Photographs and primary sources provide readers with a firsthand look at the history of the movement. Finally, readers will learn what can still be done to further equality for African Americans in the United States and how they can be ...

¿Sabrías qué alimentos elegir? ¿Cómo hacer fuego con un paquete de chicles? ¿Cocinar una pizza con una caja de zapatos? ¿Convertir un clip en una auténtica brújula? ¿Usar tu propia orina para hacer una pila? ¿Calcular la hora con un simple palo? En esta guía encontrarás los trucos más locos de supervivencia: cocinar en un vaso de cartón, vivir en una casa flotante e incluso fabricar tu propia lavadora portátil... ¡No hay límites! Aunque si lo que buscas es divertirte, también te enseñamos un montón de gamberradas que hacer con los zombis, como ponerles una cabeza de...

Who were the earliest Americans? When, how, and from where did they enter and spread across the continent? And what is their relationship to modern Native Americans? Anthropologists develop theories to answer these questions based on the evidence they discover. Their theories—and the discoveries that prove and disprove them—are highlighted in this fascinating volume, full of awe-inspiring facts and incredible breakthroughs. Readers will feel like anthropologists and archaeologists themselves as they read about bones and artifacts, and what they reveal about the ancient cultures that roamed...