Un polizón en la maleta

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...

"Simple text and photographs present scarecrows in fall-- in both English and Spanish"--Provided by publisher.

Describes where fossil fuels come from, their uses and forms, the harm they cause to the environment, and sources of renewable energy.

¿Alguna vez has oído hablar de un granjero espacial? Los agricultores espaciales son astronautas que han recibido una formación especial para aprender a cultivar plantas en el espacio exterior. Aprenda sobre el desafío de la agricultura en el espacio ultraterrestre con este libro STEAM de gran interés creado en colaboración con la Institución Smithsonian. Presenta un desafío STEAM práctico que es perfecto para espacios de creación y que guía a los estudiantes paso a paso a través del proceso de diseño de ingeniería. Establezca conexiones profesionales en STEAM con el...