Los White Sox de Chicago

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Los delfínes son conocidos por ser juguetónes intelligentes—que más podemos aprender sobre ellos? Ahora en español, este título involucra a lectores jóvenes a medida que aprenden todo acerca estes mamiferoes del mar. Fotos de color agregan interés visual, y preguntas de consideración ayudan animar lectores durante su desarrollo de leer libros de no ficción. Dolphins are known for being playful and intelligent—what else can we learn about them? Now in Spanish, this title engages young readers as they learn all about these mammals of the sea. Full-color photographs add fascinating...

¿Sabías que la gente puede excavar y utilizar el calor de la Tierra para producir energía? Esta energía geotérmica puede alimentar tu computadora y calentar o enfriar tu hogar. Pero, ¿cómo se obtiene exactamente? ¿Y cuál es el impacto sobre el medioambiente? Lee este libro para aprender todo sobre la energía geotérmica. Did you know people can dig underground and use Earth's heat to make energy? This geothermal energy can power your computer and heat or cool your home. How exactly do we get it, though? And what is the impact on our environment? Read this book to find out all about...

A koala rests comfortably in an Australian eucalyptus forest, penguin families gather on icebergs of Antarctica, an alligator protects her young in its mouth, a hippopotamus teaches her baby the art of bathing, and an elf owl peeks out of its cactus nest. These captivating images, taken by some of the world's leading wildlife photographers, introduce young children to similarities that exist between the animal world and their own. Photographs of animal habitats from all over the world teach young readers that all living creatures live in special places they call home. And by seeing animals...