Cómo podemos utilizar el tornillo?

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

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

The Uses Of Wind Energy Is The Topic Of This Book. Explains The Positive And Negative Impact This Form Of Energy Can Have On Our World.

Esta antologâia para jâovenes y niänos contiene 64 poemas de 19 paâises, mezclando el trabajo de los poetas indâigenas de antes de la Conquista con lo de escritores actuales. Los textos reunidos van de la contemplaciâon de la naturaleza a los disparates,de la polâitica a la magia.

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...

Read Along or Enhanced eBook: Take a journey into the wild world of reptiles and amphibians! Readers will learn about crocodiles, lizards, snakes, tortoises, and salamanders. Featuring a glossary, index, colorful images and charts, intriguing facts, and clear, informative text, readers will be sure to be enthralled as they move through this engaging, Spanish-translated book.

Los cuentos clásicos han pervivido hasta nuestros días por contar, de manera fantástica, hechos cotidianos en los cuales nos podemos ver reflejados. Cada cuento que aquí aparece presenta diferentes aspectos de la vida real: los sueños, la ingenuidad, la fantasía, el amor, la codicia… A partir de 8 años