Un día de trabajo de un astrónomo (A Day at Work with an Astronomer)

Earthquakes can leave people and property in bad shape. At times, they can be deadly. Find out about the science of studying earthquakes and the men and women who track the movements of the ground below us. Created in collaboration with the Smithsonian Institution, this Smithsonian Informational Text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step of the engineering design process and is perfect for makerspace activities. It makes STEAM career...

En la historia de los textos de Bécquer, la edición príncipe de 1871 tiene un interés excepcional. Realizada por los amigos del poeta, en ella se encuentra el primer catálogo canónico de sus escritos.

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 10.1px Verdana} Risas, diversión y entretenimiento con esta gran colección de los mejores chistes para todas las ocasiones.

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...