10 cosas que puedes hacer para ahorrar electricidad

Un libro milenario, una carta de navegación antigua, un reloj para viajar en el tiempo y una misión. Como escenario: el mar, el río, los glaciares y cielos sembrados de estrellas. Anusqui con su reloj mágico, viajará al siglo XI donde conocerá a su nuevo amigo Santiago. Con él y el resto de los personajes, salvarán al mundo de una inminente amenaza. ¿Os cuento un secreto? En medio de esta intrépida aventura, Anusqui conocerá a personajes históricos, se sorprenderá con el inquietante mundo de los hielos y descubrirá el porqué de sus superpoderes.

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...

Las cobijas no son calientes. ¿Entonces por qué nos dan calor? Descubre la respuesta y otras curiosidades del calor en este libro sobre la temperatura.

Which animals and plants can survive in a dry desert environment? Readers learn about the living things that make up desert food chains, including cacti, snakes, and scorpions. Colorful photographs of desert life make readers feel like they’re exploring new parts of this habitat with each turn of the page. Fact boxes provide additional information about the creatures that make up desert food chains, and a detailed food web shows how these food chains all come together. The desert is an extreme habitat, and readers will enjoy learning about the extreme plants and animals that live there.