Hacer hielo: Comprobar tu trabajo (Making Ice: Checking Your Work)

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...

Anno Domini 1412. Cuando a principios del siglo XV los grandes templos, iglesias y catedrales de Europa comienzan a derrumbarse, el pánico se apodera de la población. ¿Qué se esconde detrás de todo esto, la ira de Dios o del Diablo? En este ambiente de caos y confusión, Afra, la hermosa hija de un bibliotecario y el excéntrico maestro de obras Ulrich von Ensingen descubren un pergamino secreto cuyo contenido podría desencadenar el fin de Occidente. Con la ayuda de un alquimista, Afra y Ulrico logran descifrar el pergamino y pronto se dan cuenta de que se hallan en posesión de un...

Readers will set their eyes to the night sky in this fascinating book about astronomers. This volume is a perfect combination between STEM and career guidance as it introduces readers to the different ways astronomers use science, technology, engineering, and math in their work every day. Readers will love learning about celestial bodies and space phenomena, as well as the different processes and equipment astronomers use to observe, collect, and analyze data. This book also covers the steps a person can take to become an astronomer. The curriculum-based information in this book is conveyed...

Completa biografia ilustrada del gran conquistador Alejandro Magno (356-323 a. C.), al que se ha descrito como "el personaje mas famoso de la antiguedad despues de Jesucristo." Incluye un riguroso y detallado analisis de los acontecimientos mas fascinantes del extraordinario reinado de Alejandro: su marcha hacia la India, sus encuentros con filosofos griegos, magos persas y santones hindues, etc. Contiene mas de 150 ilustraciones, entre las que destacan mapas, obras de arte y fotografias de tesoros y artefactos del momento.